Display device capable of sensing pulse wave signal and biometric information

Abstract

The invention relates to a display device. The display device includes display pixels and photosensitive pixels in a display area. The display scan driver is configured to drive the display pixels to emit light. The photosensitive scan driver is configured to drive the photosensitive pixels to sense light. The main driving circuit is configured to detect a pulse wave signal and measure biometric information using a photosensitive signal received through the photosensitive pixel. The main driving circuit determines a normal pulse wave signal detection period or an inaccurate pulse wave signal detection period in a biological identification information measurement starting period, and changes pulse wave signal detection conditions in the inaccurate pulse wave signal detection period to detect the pulse wave signal again. And measuring biometric information using a normal pulse wave signal.

Description

Technical Field

[0001] The present disclosure relates to a display device, and more particularly, to a display device capable of sensing a pulse wave signal and biometric information. Background Art

[0002] With the development of information-oriented society, higher requirements are placed on display devices for displaying images in various ways. Display devices have been applied to various electronic devices such as smart phones, digital cameras, laptop computers, tablet PCs, navigation systems, and smart TVs. In the case of portable display devices such as smart phones, tablet PCs, etc., various functions such as image capture, fingerprint recognition, facial recognition, etc. are provided.

[0003] Recently, as the healthcare industry has become a focus, systems and methods for more easily obtaining biometric information related to health have been developed. For example, attempts have been made to replace conventional blood pressure measuring devices using an oscillometric method with portable blood pressure measuring devices. However, the portable blood pressure measuring device itself requires a separate light source, sensor, and display, and in addition to a portable smartphone or tablet PC, the portable blood pressure measuring device is then carried separately, which leads to inconvenience.

[0004] Recently, efforts have been made to combine portable display devices such as smartphones, tablet PCs, etc. with portable blood pressure measuring devices. In addition, systems and methods are being developed for measuring various biometric information such as heart rate, heart rate variability, respiration, cardiovascular disease, oxygen saturation, etc. in addition to blood pressure using portable display devices. Summary of the invention

[0005] The display device includes display pixels arranged in a display area of ​​a display panel. Photosensitive pixels are arranged in the display area with the display pixels. A display scan driver is configured to drive the display pixels to emit light. A photosensitive scan driver is configured to drive the photosensitive pixels to sense light. A main drive circuit is configured to detect a pulse wave signal using a photosensitive signal received by the photosensitive pixels and measure biometric information. The main drive circuit is configured to determine a normal pulse wave signal detection period or an inaccurate pulse wave signal detection period in a biometric information measurement start period, change a pulse wave signal detection condition in an inaccurate pulse wave signal detection period to re-detect the pulse wave signal, and measure biometric information using a normal pulse wave signal.

[0006] The main driving circuit can display the touch sensing area of ​​the body part through the application screen in the display area, display the waveform of the pulse wave signal detected in real time on the display window of the application screen, and display the period of the detected pulse wave signal and the pulse wave signal detection period required for measuring biometric information in the form of a circular graph or a bar graph.

[0007] The main driving circuit can generate a pulse wave signal corresponding to the amplitude and amplitude change of the photosensitive signal, analyze the high pulse amplitude change and the low pulse amplitude change of the pulse wave signal in real time, calculate the average amplitude value of the high pulse and the average amplitude value of the low pulse in real time, and set a normal pulse wave signal detection period or an inaccurate pulse wave signal detection period in real time according to the comparison result of the average amplitude value of the high pulse with the preset high threshold and the comparison result of the average amplitude value of the low pulse with the preset low threshold.

[0008] The display device includes display pixels arranged in a display area of ​​a display panel, photosensitive pixels arranged in the display area with the display pixels, and infrared light-emitting pixels arranged in the display area with the display pixels and the photosensitive pixels. The display scan driver is configured to drive the display pixels to emit light. The photosensitive scan driver is configured to drive the photosensitive pixels to sense light. The touch sensing unit is arranged on the front surface of the display panel to sense touch and output a touch sensing signal. The touch drive circuit is configured to generate touch data and touch coordinate data according to the amplitude change and output position of the touch sensing signal. The main drive circuit is configured to detect a pulse wave signal using the photosensitive signal received by the photosensitive pixel and measure biometric information. The main drive circuit is configured to determine a normal pulse wave signal detection period or an inaccurate pulse wave signal detection period in the biometric information measurement start period, change the pulse wave signal detection condition in the inaccurate pulse wave signal detection period to re-detect the user's pulse wave signal, and measure the biometric information using the normal pulse wave signal. 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:

[0010] Figure 1 is a perspective view showing a display device according to an embodiment;

[0011] Figure 2 It is shown Figure 1 A plan view of the arrangement structure of the display panel and the display driving circuit shown in FIG.

[0012] Figure 3 It is shown Figure 1 A cross-sectional view showing a configuration of a display device as shown in ;

[0013] Figure 4 It is shown Figure 1 A cross-sectional view of an embodiment of a configuration of a display device shown in FIG.

[0014] Figure 5 It is schematically shown Figures 1 to 4 An example layout diagram of a display panel shown in FIG.

[0015] Figure 6 is a layout diagram showing a display area according to an embodiment;

[0016] Figure 7 is a circuit diagram showing a display pixel and a photosensitive pixel according to an embodiment;

[0017] Figure 8 is a diagram showing an image display screen and a body part touch area detection process during a biometric information measurement period;

[0018] Fig. 9 is a diagram showing a pulse wave signal detected in real time during a biometric information measurement period and an inaccurate pulse wave signal detection process;

[0019] Fig.10 is a diagram showing an image display screen shown when an inaccurate pulse wave signal is detected during a biometric information measurement period;

[0020] Fig.11 is a flowchart illustrating a method of measuring biometric information according to an embodiment of the present disclosure;

[0021] Fig.12 is a waveform diagram showing a sensing scan signal and a reset signal input to a first display pixel and a photosensitive pixel of a display pixel according to an embodiment;

[0022] Fig.13 is an image diagram showing a state in which a pulse wave signal is inaccurately detected during a biometric information measurement period;

[0023] Fig.14 is a waveform diagram showing pressure changes measured in real time during a biometric information measurement cycle;

[0024] Fig.15 is a waveform diagram showing an implementation of a modified example of a sensing signal and a reset signal input to a first display pixel and a photosensitive pixel of a display pixel;

[0025] Fig.16 is a diagram showing an image display screen showing an accurate pulse wave signal detection state by a mobile display device;

[0026] Fig.17 is a diagram showing an image display screen showing an accurate pulse wave signal detection state by a watch-type display device;

[0027] Fig.18 is a diagram showing a method for calculating blood pressure information in biometric information according to an embodiment;

[0028] Fig.19is a diagram showing a method for calculating information on heart rate and respiration in biometric information according to an embodiment;

[0029] Fig. 20 is a diagram showing a heart rate variability change state measured in real time by feeding back the heart rate variability change state to a mobile display device and a watch type display device as an application screen;

[0030] Fig.21 is a diagram showing a method for calculating respiratory frequency and respiratory timing information in biometric information according to an embodiment;

[0031] Fig. 22 is a diagram showing a method for calculating information on vascular elasticity in biometric information according to an embodiment;

[0032] Fig.23 is a diagram showing a method for calculating information on cardiovascular disease in biometric information according to an embodiment;

[0033] Fig.24 is a diagram showing a method for calculating information on oxygen saturation in biometric information according to an embodiment; and

[0034] Fig.25 is a diagram showing the results of measuring biometric information by a mobile display device and a watch-type display device. DETAILED DESCRIPTION

[0035] The present disclosure will now be described more fully below 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 necessarily be construed as 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.

[0036] 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 and drawings, the same reference numerals may refer to the same components.

[0037] It will be understood that although the terms "first", "second", etc. may be used herein to describe various elements, these elements are not necessarily limited by these terms. These terms are used to distinguish one element from another element. For example, without departing from the teachings of the present disclosure, the first element discussed below may be referred to as the second element. Similarly, the second element may also be referred to as the first element.

[0038] Each of the features of the various embodiments of the present disclosure can be combined in part or in whole or in combination with each other, and various interlocks and drives are technically possible. Each embodiment can be implemented independently of each other, or can be implemented in conjunction with each other.

[0039] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

[0040] Figure 1 is a perspective view showing a display device according to an embodiment. Figure 2 It is shown Figure 1 A plan view of the arrangement structure of the display panel and the display driving circuit shown in FIG. Figure 3 It specifically shows Figure 1 A cross-sectional view of the configuration of the display device shown in FIG.

[0041] refer to Figure 1 and Figure 2 , the display device 10 according to the embodiment can be applied to portable electronic devices such as mobile phones, smart phones, tablet personal computers, mobile communication terminals, electronic notebooks, electronic books, portable multimedia players (PMP), navigation systems, ultra-mobile PCs (UMPCs), etc. In addition, the display device 10 according to the embodiment can be used as a display unit of a television, a laptop computer, a computer display, a digital billboard, or an Internet of Things (IoT) device. Alternatively, according to the embodiment, the display device 10 can be applied to wearable devices such as smart watches, watch phones, glasses-type displays, or head-mounted displays (HMD). In addition, the display device 10 according to the embodiment can be applied to the dashboard of a vehicle, the central dashboard of a vehicle, a central information display (CID) set on the dashboard of a vehicle, an in-vehicle mirror display instead of a side mirror of a vehicle, or a display for rear seat entertainment set on the rear surface of the front seat of a vehicle.

[0042] The display device 10 may be a light-emitting display device, such as an organic light-emitting diode (OLED) display device using 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-light-emitting diode (LED) or a nano-light-emitting diode (LED). In the following description, it is assumed that the display device 10 is an organic light-emitting diode display device, but the present disclosure is not necessarily limited thereto.

[0043] refer to Figure 1 and Figure 3The display device 10 includes a display panel 100, a main driving circuit 200, a touch sensing unit TSU, a pressure sensing unit PSU, a circuit board 300, and a touch driving circuit 400. The display panel 100 (eg, a display module DU) may include a substrate SUB, a thin film transistor layer TFTL, an emission layer EML, and an encapsulation layer TFEL.

[0044] In a plan view, the display panel 100 may be formed in a rectangular shape having a pair of short sides extending in a first direction DR1 and a pair of long sides extending in a second direction DR2 intersecting the first direction DR1. The corners where the short sides in the first direction DR1 and the long sides in the second direction DR2 intersect may be right angles or rounded to have a predetermined curvature. The planar shape of the display panel 100 is not necessarily limited to a rectangular shape, and may be formed in another 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 portion formed at the left and right ends and having a constant curvature or a varying curvature. In addition, the display panel 100 may be flexibly formed so that it may be curved, bent, folded, or curled to a significant degree without breaking or otherwise being damaged.

[0045] The substrate SUB of the display panel 100 may include a main area MA and a sub area SBA.

[0046] 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.

[0047] The non-display area NDA may be disposed 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. The non-display area NDA may be an edge area of ​​the display panel 100.

[0048] The display area DA includes display pixels for displaying images and light-sensing pixels for sensing light reflected from a body part of a user, such as a face or a finger. In addition, the display area DA may also include infrared light-emitting pixels that emit infrared light.

[0049] 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.

[0050] The display area DA can be divided into an image display area and a biometric information measurement area FSA (see Figure 8), in the image display area, only display pixels are arranged without light-sensing pixels, and in the biometric information measurement area FSA, display pixels and light-sensing pixels are mixed and arranged. For example, light-sensing pixels may be arranged together with display pixels only in a predetermined portion of the biometric information measurement area FSA in the entire display area DA of the display panel 100. An example in which display pixels and light-sensing pixels are alternately arranged in the entire display area DA will be described below.

[0051] refer to Figure 2 and Figure 3 , the sub-region SBA may protrude from one side in the second direction DR2 of the main region MA. The length of the sub-region SBA in the second direction DR2 may be less than the length of the main region MA in the second direction DR2. The length of the sub-region SBA in the first direction DR1 may be substantially equal to or less than the length of the main region MA in the first direction DR1.

[0052] The sub-area SBA may include a first area A1, a second area A2, and a bending area BA.

[0053] The first area A1 is an area protruding from one side in the second direction DR2 of the main area MA. 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.

[0054] The second area A2 is an area on which the pads DP and the main driving circuit 200 are disposed. The main driving circuit 200 may be attached to the driving pads of the second area A2 using a conductive adhesive such as an anisotropic conductive layer. The circuit board 300 may be attached to the pads DP of the second area A2 using a conductive adhesive. One side of the second area A2 may be in contact with the bending area BA.

[0055] The bending area BA is an area in a bending state. 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. 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.

[0056] like Figure 3 As shown in , the sub-area SBA may be bent, and in this case, it may be disposed under the main area MA. The sub-area SBA may overlap the main area MA in the third direction DR3.

[0057] A touch sensing unit TSU for sensing a body part such as a finger, an electronic pen / stylus pen, etc. is formed or disposed on a front portion of the display panel 100. The touch sensing unit TSU may include a plurality of touch electrodes for sensing a user's touch in a capacitive manner.

[0058] The touch sensing unit TSU includes a plurality of touch electrodes intersecting each other in 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 may be spaced apart from each other in parallel in the first direction DR1, and the plurality of sensing electrodes may be spaced apart from each other in parallel in the second direction DR2 to intersect with the plurality of drive electrodes with an organic material layer or an inorganic material layer interposed therebetween. The plurality of drive electrodes and the plurality of sensing electrodes may extend to a wiring area between display pixels and photosensitive pixels arranged in the display area DA so as not to overlap with the display pixels and the photosensitive pixels. The plurality of drive electrodes and the plurality of sensing electrodes form mutual capacitances and transmit touch sensing signals that vary according to the touch of the user to the touch drive circuit 400.

[0059] The touch drive circuit 400 provides a touch drive signal to a plurality of drive electrodes and receives a touch sensing signal from a plurality of sensing electrodes. Then, the change in the mutual capacitance between the drive electrode and the sensing electrode is sensed according to the change in the amplitude of the touch sensing signal. The touch drive circuit 400 generates touch data according to the change in the mutual capacitance between the drive electrode and the sensing electrode, and obtains the position of the sensed touch. Therefore, the coordinate data of the position of the sensed touch can be provided to the main drive circuit 200.

[0060] Figure 4 It specifically shows Figure 1 A cross-sectional view of an embodiment of a configuration of a display device shown in FIG.

[0061] The pressure sensing unit PSU for sensing pressure applied by a body part such as a finger or the like may be disposed or formed on the front surface of the display panel 100, for example, disposed or formed on the surface between the display panel 100 and the touch sensing unit TSU. As described above, the pressure sensing unit PSU may be formed on the front surface of the display panel 100 and the rear surface of the touch sensing unit TSU. Alternatively, the pressure sensing unit PSU may be formed on the rear surface of the substrate SUB or on the front surface of the substrate SUB.

[0062] The pressure sensing unit PSU is used in case of detecting absolute blood pressure related measurements, but may not be necessary in case of detecting relative blood pressure related measurements.

[0063] In the case of forming the pressure sensing unit PSU, the pressure sensing unit PSU may be formed of a transparent sheet type in which a plurality of transparent electrodes are arranged in vertical and horizontal directions, and may be disposed on the front surface of the main area MA. Alternatively, the pressure sensing unit PSU may be disposed or formed on the inside or front portion of the display panel 100.

[0064] The pressure sensing unit PSU includes a plurality of pressure sensing electrodes intersecting each other in a first direction DR1 and a second direction DR2. The plurality of pressure sensing electrodes include a plurality of lower electrodes spaced apart from each other in parallel in the first direction DR1 and a plurality of upper electrodes spaced apart from each other in parallel in the second direction DR2 to intersect with the plurality of lower electrodes, with a transparent inorganic (or organic) material layer interposed therebetween. The plurality of lower electrodes and the plurality of upper electrodes form self-capacitance with the transparent inorganic (or organic) material layer interposed therebetween, and transmit a pressure sensing signal that varies according to a user's touch pressure to the touch drive circuit 400.

[0065] When the pressure sensing unit PSU is disposed on the inner surface or the front surface of the display panel 100, the pressure sensing electrodes (i.e., a plurality of lower electrodes and a plurality of upper electrodes) of the pressure sensing unit PSU may extend to a wiring area between display pixels and photosensitive pixels arranged in the display area DA so as not to overlap with the display pixels and the photosensitive pixels. The touch drive circuit 400 may provide a reference voltage to the lower electrode of the pressure sensing unit PSU and receive a pressure sensing signal from its upper electrode, thereby sensing a change in the self-capacitance of the pressed area using the pressure sensing signal. Therefore, the touch drive circuit 400 may generate pressure data based on the amount of change in self-capacitance and the sensing coordinate data of the sensed touch position, and provide the generated data to the main drive circuit 200. In addition to the structure using the pressure sensing electrode, the pressure sensing unit PSU may have various other structures and is not necessarily limited to. Figure 3 and Figure 4 Description.

[0066] 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 printed circuit board, or a flexible film such as a chip on a film.

[0067] The main driving circuit 200 may generate an electrical signal such as a data voltage and a control signal for driving the display panel 100. The touch driving circuit 400 may be formed as an integrated circuit (IC) and attached to the display panel 100 or the circuit board 300 by a chip on glass (COG) method, a chip on plastic (COP) method, or an ultrasonic bonding method, but the present disclosure is not necessarily limited thereto. For example, the touch driving circuit 400 may be attached to the circuit board 300 by a chip on film (COF) method.

[0068] Figure 5 It is schematically shown Figures 1 to 4 . For example, Figure 5 is a layout diagram showing a display area DA and a non-display area NDA of a display module DU before a touch sensing unit TSU is formed thereon.

[0069] Together with Figures 2 to 4 Reference together Figure 5 According to an embodiment, the display scanning driver 110, the photosensitive scanning driver 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 integrally formed of a single chip type and may be mounted on the display panel 100 or the circuit board 300. However, hereinafter, in order to simplify the functional description, an example in which the main driving circuit 200 and the touch driving circuit 400 are formed as different integrated circuits will be described.

[0070] refer to Figure 5 The display panel 100 may include display pixels SP, light-sensing pixels LSP, display scan lines GL, 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. Each of the display scan driver 110 and the light-sensing scan driver 120 is disposed in the non-display area NDA.

[0071] The display scan lines GL sequentially provide display scan signals applied in units of horizontal lines from the display scan driver 110 to the display pixels SP and the light sensing pixels LSP of each horizontal line. The display scan lines GL may extend in a first direction DR1 and may be spaced apart from each other in a second direction DR2 intersecting the first direction DR1.

[0072] The emission control lines VL sequentially provide the display pixels SP and the light sensing pixels LSP of each horizontal line with emission control signals applied in units of horizontal lines from the display scan driver 110. The emission control lines VL may extend in a first direction DR1 in parallel with the display scan lines GL, and may be spaced apart from each other in a second direction DR2 intersecting the first direction DR1.

[0073] The data lines DL may provide the plurality of display pixels SP with data voltages received from the main driving circuit 200. The plurality of data lines DL may extend in the second direction DR2 and may be spaced apart from each other in the first direction DR1.

[0074] The photosensitive scan lines FSL sequentially provide the plurality of photosensitive pixels LSP with sensing scan signals applied in units of horizontal lines from the photosensitive scan driver 120. The photosensitive scan lines FSL may extend in a first direction DR1 and may be spaced apart from each other in a second direction DR2 intersecting the first direction DR1.

[0075] The sensing reset line REL sequentially provides a sensing reset signal applied in units of horizontal lines from the light sensing scanning driver 120 to a plurality of light sensing pixels LSP of each horizontal line. The sensing reset line REL may extend in a first direction DR1 in parallel with the light sensing scanning line FSL and may be spaced apart from each other in a second direction DR2 intersecting the first direction DR1.

[0076] The sensing lines ERL are connected between the photosensitive pixels LSP and the main driving circuit 200 to provide the sensing signals output from the photosensitive pixels LSP to the main driving circuit 200. The sensing lines ERL may be arranged and extended in the second direction DR2 according to the arrangement direction of the main driving circuit 200, and may be spaced apart from each other in the first direction DR1.

[0077] The non-display area NDA may at least partially surround the display area DA. The non-display area NDA may include a display scan driver 110, a light sensing scan driver 120, a fan-out line FOL, a gate control line GCL, and a light sensing control line SCL.

[0078] The display pixel SP and the light-sensing pixel LSP may form a first unit pixel and may be arranged in a matrix form in 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 pixel SP and the at least one infrared light-emitting pixel may form a second unit pixel, and the second unit pixel and the first unit pixel may be alternately arranged in a matrix form in the display area DA.

[0079] For example, three display pixels SP that display red light, green light, and blue light, respectively, and one photosensitive 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 into horizontal stripes or vertical stripes. Alternatively, the first unit pixel and the second unit pixel may be alternately arranged in a zigzag shape in a plan view, and may be arranged in a matrix form in a diagonal direction.

[0080] Each of the red, green and blue display pixels SP and the infrared light-emitting pixels can be connected to any one of the display scan lines GL and any one of the emission control lines VL. During the image display period, the red, green and blue display pixels SP can receive the data voltage of the data line DL according to the display scan signal of the display scan line GL and the emission control signal of the emission control line VL, and can provide a driving current to the light-emitting element according to the data voltage, thereby emitting light. Here, during the measurement period of biometric information such as blood pressure, heart rate, oxygen saturation, vascular elasticity, etc., the display pixel SP displaying at least one color among the red, green and blue display pixels SP can selectively receive the data voltage for light emission together with the display scan signal and the emission control signal and display light. In addition, during the measurement period of biometric information such as blood pressure, heart rate, etc., the infrared light-emitting pixels can selectively receive the data voltage for light emission together with the display scan signal and the emission control signal and display infrared light.

[0081] The photosensitive pixels LSP may be arranged alternately with the red, green, and blue display pixels SP in the vertical direction or the horizontal direction. Each of the photosensitive pixels LSP may be connected to one of the photosensitive scan lines FSL, one of the sensing reset lines REL, and one of the photosensitive lines ERL. During the measurement cycle of biometric information such as blood pressure, respiratory rate, oxygen saturation, whether there is cardiovascular disease, etc., each of the photosensitive pixels LSP is reset in response to a sensing reset signal from the sensing reset line REL, and then a photosensitive signal corresponding to the amount of reflected light incident from the front surface may be generated and output. In addition, each of the photosensitive pixels LSP may transmit a photosensitive signal to the photosensitive line ERL in response to a sensing scan signal from the photosensitive scan line FSL.

[0082] The photosensitive pixels LSP in units of horizontal lines can be connected to one display scanning line GL of each horizontal line. Each of the photosensitive pixels LSP can generate a photosensitive signal corresponding to the amount of reflected light incident from the front surface, and can output the photosensitive signal to the photosensitive line ERL in response to the display scanning signal input through the display scanning line GL.

[0083] The display scan driver 110 may be disposed in the non-display area NDA. Although the display scan driver 110 is shown as being on one side (e.g., the left side) of the display panel 100, it is not necessarily limited to the drawings herein. For example, the display scan driver 110 may be disposed on both sides (e.g., the left side and the right side) of the display panel 100.

[0084] The display scan driver 110 may be electrically connected to the main drive circuit 200 through the gate control line GCL. The display scan driver 110 receives a scan control signal from the main drive circuit 200, and sequentially generates display scan signals in units of horizontal line drive cycles according to the scan control signal, and sequentially supplies them to the display scan lines GL. In addition, the display scan driver 110 may sequentially generate emission control signals according to the scan control signal from the main drive circuit 200, and sequentially supply them to the emission control lines VL.

[0085] The gate control line GCL may extend from the main driving circuit 200 to the display scanning driver 110 according to the arrangement position of the display scanning driver 110. The gate control line GCL may provide a scanning control signal received from the main driving circuit 200 to the display scanning driver 110.

[0086] The light-sensing scanning driver 120 may be disposed in another partial non-display area NDA different from the partial non-display area NDA of the display scanning driver 110 . Figure 5 The photosensitive scanning driver 120 is shown to be disposed on the other side (e.g., the right side) of the display panel 100, but the present disclosure is not necessarily limited to this. The photosensitive scanning driver 120 can be electrically connected to the main drive circuit 200 via the photosensitive control line SCL. The photosensitive scanning driver 120 receives a photosensitive control signal from the main drive circuit 200, and sequentially generates a reset control signal and a photosensitive scanning signal in units of a horizontal line drive cycle according to the photosensitive control signal. Then, the sequentially generated reset control signal is sequentially provided to the sensing reset line REL. In addition, the photosensitive scanning driver 120 can sequentially generate sensing scanning signals according to the photosensitive control signal from the main drive circuit 200, and sequentially provide them to the photosensitive scanning line FSL.

[0087] The photosensitive control line SCL may extend from the main driving circuit 200 to the photosensitive scanning driver 120 according to the arrangement position of the photosensitive scanning driver 120. The photosensitive control line SCL may provide the photosensitive scanning driver 120 with a photosensitive control signal received from the main driving circuit 200.

[0088] 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 arranged at the 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 by using an anisotropic conductive film or a low-resistance, high-reliability material such as SAP. The first touch pad area TPA1 may include a first touch pad TP1, and the second touch pad area TPA2 may include a second touch pad TP2.

[0089] 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 is connected so that a data voltage received from the main driving circuit 200 may be provided to each of the plurality of data lines DL.

[0090] The main driving circuit 200 may output a signal and a voltage for driving the display panel 100 to the fan-out line FOL. The main driving circuit 200 may provide a data voltage to the data line DL through the fan-out line FOL. The data voltage may be provided to a plurality of display pixels SP to determine the brightness of the display pixels SP. The main driving circuit 200 may provide a scan control signal to the display scan driver 110 through the gate control line GCL.

[0091] 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 photoplethysmography signal in the biometrics signal corresponding to an amplitude variation of the light sensing signal (eg, a pulse wave signal).

[0092] In addition to the pulse wave signal, the biometric signal may also include an electromyogram (EMG) signal, an electroencephalogram (EEG) signal, etc. However, an example in which the main driving circuit 200 detects and analyzes the pulse wave signal in the biometric signal to measure the user's biometric information will be described below. The user's biometric information includes information such as blood pressure, heart rate, heart rate variability, respiratory rate, vascular elasticity, whether cardiovascular disease occurs, oxygen saturation, etc.

[0093] The main drive circuit 200 can use the preset application screen to guide the pulse wave signal detection process, so that the user's pulse wave signal can be accurately detected, and the pulse wave signal can be analyzed to sample the detected pulse wave signal and select more accurately. Then, the main drive circuit 200 analyzes the pulse wave signal in units of preset cycles to measure biometric information such as blood pressure, heart rate, heart rate variability, respiratory rate, vascular elasticity, whether cardiovascular disease occurs, oxygen saturation, etc. Therefore, the main drive circuit 200 can display the measurement results of biometric information (such as blood pressure, heart rate, heart rate variability, respiratory rate, vascular elasticity, whether cardiovascular disease occurs, oxygen saturation, etc.) on the application screen.

[0094] Figure 6 is a diagram showing a layout of a display area according to an embodiment.

[0095] refer to Figure 6 , the display area DA may include display pixels SP, infrared light emitting pixels ISP and light sensing pixels LSP. Here, the display pixels SP may be divided into first display pixels SP1, second display pixels SP2 and third display pixels SP3.

[0096] The first unit pixel PG1 may include a light-sensing pixel LSP, a first display pixel SP1, a second display pixel SP2, and a third display pixel SP3. In addition, the second unit pixel PG2 may include an infrared light-emitting pixel ISP, a first display pixel SP1, a second display pixel SP2, and a third display pixel SP3.

[0097] The first unit pixel PG1 and the second unit pixel PG2 may be defined as a display pixel of a minimum unit capable of displaying white light, and 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 in a plan view, and may be arranged in a matrix form in one diagonal direction. In addition, the first unit pixel PG1 and the second unit pixel PG2 may be alternately arranged in a matrix form in a plan view in horizontal stripes or vertical stripes.

[0098] The first display pixel SP1 may include a first light emitting part ELU1 emitting first light and a first pixel driver DDU1 for applying a driving current to a light emitting element of the first light emitting part ELU1. The first light may be light of a red wavelength band. For example, the main peak wavelength of the first light may be at about 600nm to 750nm.

[0099] The second display pixel SP2 may include a second light emitting part ELU2 emitting a second light and a second pixel driver DDU2 for applying a driving current to a light emitting element of the second light emitting part ELU2. The second light may be light of a blue wavelength band. For example, the main peak wavelength of the second light may be located at about 370nm to 460nm.

[0100] The third display pixel SP3 may include a third light emitting part ELU3 emitting the third light and a third pixel driver DDU3 for applying a driving current to the light emitting element of the third light emitting part ELU3. For example, the third light may be light of a green wavelength band. For example, the main peak wavelength of the third light may be located at about 480nm to 560nm.

[0101] The infrared light emitting pixel ISP may include an infrared light emitting part ILU emitting light of an infrared wavelength band and an infrared light pixel driver IDU for applying a driving current to the light emitting element of the infrared light emitting part ILU. The main peak wavelength of the infrared light may be located at about 750nm to 1mm.

[0102] The light-sensing pixel LSP includes a light-sensing part PDU and a sensing driver FDU.

[0103] In the first unit pixel PG1, the first pixel driver DDU1 to the third pixel driver DDU3 may be arranged in a predetermined order in the first direction DR1. Alternatively, any one of the first pixel driver DDU1 to the third pixel driver DDU3 may be disposed in the first direction DR1 of another adjacent pixel driver. In addition, the sensing driver FDU may be disposed in the first direction DR1 of any one of the first pixel driver DDU1 to the third pixel driver DDU3. Alternatively, the sensing driver FDU may be disposed in the second direction DR2 of any one of the first pixel driver DDU1 to the third pixel driver DDU3.

[0104] The first pixel drivers DDU1 adjacent to each other in the direction of the data line DL may be arranged in the second direction DR2. The second pixel drivers DDU2 adjacent to each other in the direction of the data line DL may be arranged in the second direction DR2. Similarly, all the sensing drivers FDU adjacent to each other in the direction of the data line DL may also be arranged in the second direction DR2.

[0105] The first light emitting part ELU1, the second light emitting part ELU2, the third light emitting part ELU3, the infrared light emitting part ILU and the photosensitive part PDU may have a rectangular, octagonal or rhombus plane shape, but the present disclosure is not necessarily limited thereto. The first light emitting part ELU1, the second light emitting part ELU2, the third light emitting part ELU3, the infrared light emitting part ILU and the photosensitive part PDU may have another polygonal plane shape other than a rectangle, an octagon and a rhombus.

[0106] Due to the arrangement positions and plane shapes of the first light-emitting part ELU1, the second light-emitting part ELU2, the third light-emitting part ELU3 and the photosensitive part PDU, the distance D12 between the center C1 of the first light-emitting part ELU1 and the center C2 of the second light-emitting part ELU2 adjacent to each other, the distance D23 between the center C2 of the second light-emitting part ELU2 and the center C3 of the third light-emitting part ELU3 adjacent to each other, the distance D14 between the center C1 of the first light-emitting part ELU1 and the center C4 of the photosensitive part PDU adjacent to each other in another direction, and the distance D34 between the center C4 of the photosensitive part PDU and the center C3 of the third light-emitting part ELU3 may all be substantially the same.

[0107] Figure 7 is a circuit diagram showing a display pixel and a light-sensing pixel according to an embodiment.

[0108] refer to Figure 7 , each display pixel SP according to an 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 emission control line VLk. In addition, the display pixel SP may be connected to a first drive voltage line VDL to which a first drive voltage is supplied, a second drive voltage line VSL to which a second drive voltage is supplied, and a third drive voltage line VIL to which a third drive voltage is supplied. Hereinafter, letters k, n, etc. used instead of numbers may be positive integers other than 0, and may be numbers identical to each other.

[0109] The display pixel SP may include a light emitting part ELU and a pixel driver DDU. The light emitting part ELU may include a light emitting element LEL. The pixel driver DDU may include a driving transistor DT, a switching element and a capacitor CST1. The switching element includes a first transistor ST1, a second transistor ST2, a third transistor ST3, a fourth transistor ST4, a fifth transistor ST5 and a sixth transistor ST6.

[0110] 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 according to a data voltage applied to the gate electrode. The driving current Ids flowing through the channel of the driving transistor DT is proportional to the square of the difference between the threshold voltage Vth of the driving transistor DT and the voltage Vsg between the first electrode and the gate electrode, as shown in equation (1).

[0111] Ids = k' × (Vsg - Vth) 2 .................(1)

[0112] In Equation 1, k′ is a proportionality coefficient determined by the structure and physical characteristics of the driving transistor DT, Vsg is a voltage between the first electrode and the gate electrode of the driving transistor DT, and Vth is a threshold voltage of the driving transistor DT.

[0113] The light emitting element LEL emits light by the driving current Ids. As the driving current Ids increases, the amount of light emitted from the light emitting element LEL may increase.

[0114] The light emitting element LEL may be an organic light emitting diode including an organic light emitting layer disposed between the anode electrode and the cathode electrode. Alternatively, the light emitting element LEL may be an inorganic light emitting element including an inorganic semiconductor disposed between the anode electrode and the cathode electrode. Alternatively, the light emitting element LEL may be a quantum dot light emitting element including a quantum dot light emitting layer disposed between the anode electrode and the cathode electrode. Alternatively, the light emitting element LEL may be a micro light emitting element including a micro light emitting diode disposed between the anode electrode and the cathode electrode.

[0115] 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.

[0116] The first transistor ST1 is turned on by the display initialization 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 can be applied to the gate electrode of the driving transistor DT. The gate electrode of the first transistor ST1 can be connected to the kth display initialization line GILk, its first electrode can be connected to the gate electrode of the driving transistor DT, and its second electrode can be connected to the third driving voltage line VIL.

[0117] The second transistor ST2 is turned on by the display scan signal of the k-th display scan line GLk to connect the first electrode of the driving transistor DT to the data line DL. Therefore, the data voltage of the data line DL can be applied to the first electrode of the driving transistor DT. The gate electrode of the second transistor ST2 can be connected to the k-th display scan line GLk, the first electrode thereof can be connected to the first electrode of the driving transistor DT, and the second electrode thereof can be connected to the data line DL.

[0118] The third transistor ST3 is turned on by the display scan signal of the kth display scan line GLk to connect the gate electrode of the driving transistor DT to its second electrode. When the gate electrode of the driving transistor DT is connected to its second electrode, 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, its first electrode may be connected to the second electrode of the driving transistor DT, and its second electrode may be connected to the gate electrode of the driving transistor DT.

[0119] The fourth transistor ST4 is turned on by the display control signal of the kth display control line GCLk to connect 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 thereof is connected to the anode electrode of the light emitting element LEL, and the second electrode thereof is connected to the third driving voltage line VIL.

[0120] The fifth transistor ST5 is turned on by the emission control signal of the kth emission control line VLk to connect the first electrode of the driving transistor DT to the first driving voltage line VDL. The gate electrode of the fifth transistor ST5 is connected to the kth emission control line VLk, the first electrode thereof is connected to the first driving voltage line VDL, and the second electrode thereof is connected to the first electrode of the driving transistor DT.

[0121] 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 emission control signal of the kth emission control line VLk to connect 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 kth emission control line VLk, the first electrode thereof is connected to the second electrode of the driving transistor DT, and the second electrode thereof is connected to the anode electrode of the light emitting element LEL.

[0122] When both the fifth transistor ST5 and the sixth transistor ST6 are turned on, a driving current Ids of the driving transistor DT according to a data voltage applied to the gate electrode of the driving transistor DT may flow to the light emitting element LEL.

[0123] 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 thereof may be connected to the first driving voltage line VDL.

[0124] When the first electrode of the driving transistor DT and each of the first to sixth transistors ST1 to ST6 is a source electrode, the second electrode thereof may be a drain electrode. Alternatively, when the first electrode of the driving transistor DT and each of the first to sixth transistors ST1 to ST6 is a drain electrode, the second electrode thereof may be a source electrode.

[0125] The active layer of each of the driving transistor DT and the first to sixth transistors ST1 to ST6 may be formed of any one of polysilicon, amorphous silicon, and an oxide semiconductor. Figure 7 , the first transistor ST1 to the sixth transistor ST6 and the driving transistor DT are mainly described as being formed by P-type MOSFETs, but the present disclosure is not necessarily limited thereto. For example, the first transistor ST1 to the sixth transistor ST6 and the driving transistor DT may be formed by N-type MOSFETs. Alternatively, at least one of the first transistor ST1 to the sixth transistor ST6 may be formed by an N-type MOSFET.

[0126] The photosensitive pixels LSP are electrically connected to the nth sensing reset line RELn, the nth photosensitive scan line FSLn, and the nth photosensitive line RLn, respectively. Each of the photosensitive pixels LSP can be reset by a reset signal from the nth sensing reset line RELn, and can transmit a photosensitive signal to each nth photosensitive line RLn in response to a sensing scan signal from the nth photosensitive scan line FSLn.

[0127] The light sensing pixel LSP may be divided into a light sensing portion PDU including a light sensing element PD and a sensing driver FDU including first to third sensing transistors RT1 to RT3 and a sensing capacitor. Here, the sensing capacitor may be formed in parallel with the light sensing element PD.

[0128] The first sensing transistor RT1 of the sensing driver FDU may allow a photosensitive current to flow according to the voltage of the photosensitive element PD and the sensing capacitor. The amount of the photosensitive current may vary according to the voltage applied to the photosensitive element PD and the sensing capacitor. The gate electrode of the first sensing transistor RT1 may be connected to the second electrode of the photosensitive 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.

[0129] 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 allow the sensing current of the first sensing transistor RT1 to flow to the nth light-sensing line RLn. In this case, the nth light-sensing line RLn may be charged with the sensing voltage by the sensing current. The gate electrode of the second sensing transistor RT2 may be connected to the nth light-sensing scan line FSLn, the first electrode thereof may be connected to the second electrode of the first sensing transistor RT1, and the second electrode thereof may be connected to the nth light-sensing line RLn.

[0130] 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 photosensitive 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 thereof may be connected to the reset voltage source VRST, and a second electrode thereof may be connected to the second electrode of the photosensitive element PD.

[0131] Figure 7 It is shown that the first sensing transistor RT1 and the second sensing transistor RT2 are formed by a P-type metal oxide semiconductor field effect transistor (MOSFET), and the third sensing transistor RT3 is formed by an N-type MOSFET. However, the embodiments of the present disclosure are not necessarily limited thereto, and they can be selectively formed in the same type or different types. In addition, any 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 can be a source electrode, and the other can be a drain electrode.

[0132] Figure 8 is a diagram showing an image display screen and a body part touch area detection process during a biometric information measurement period.

[0133] refer to Figure 8 During the biometric information detection period, the main driving circuit 200 provides a data voltage to the first unit pixel PG1 and the second unit pixel PG2 of the display panel 100, and provides a control signal to the display scan driver 110 and the photosensitive scan driver 120 to display a preset guide screen for pulse wave signal detection in the display area DA.

[0134] The main driving circuit 200 displays a sensing body part (such as a finger F (see FIG. 1 )) on the guidance screen for pulse wave detection. Fig.10) etc.), and guide the pulse wave signal detection process. At this time, the main driving circuit 200 displays the biometric information measurement area FSA in the form of a circular graph or a bar graph, the cycle required for biometric information measurement, the pulse wave signal detection cycle, and the biometric information measurement area FSA on the application screen.

[0135] For example, during the biometric information detection period, the main driving circuit 200 receives the touch position coordinates sensed by the touch sensing unit TSU or the pressure sensing unit PSU using the touch driving circuit 400. Then, the main driving circuit 200 provides the data voltage to the first unit pixel PG1 and the second unit pixel PG2 arranged at the portion of the biometric information measurement area FSA touched by the finger F, and provides the control signal to the display scanning driver 110 and the photosensitive scanning driver 120. At this time, the main driving circuit 200 can provide a preset data voltage to at least one of the first display pixel SP1 and the second display pixel SP2 included in the first unit pixel PG1 and the second unit pixel PG2, so that the light signal can be detected by at least one of the green light and the red light. Thereafter, the main driving circuit 200 receives the light signal, for example, the photosensitive signal, from the photosensitive pixel LSP through the photosensitive light line ERL of the display panel 100.

[0136] The main driving circuit 200 detects a pulse wave signal (PPG signal) corresponding to the light-sensing signal received in real time and stores it as digital signal data. The pulse wave signal is a signal corresponding to the amplitude of the light-sensing signal and the change of its amplitude.

[0137] Fig. 9 is a diagram showing a pulse wave signal detected in real time during a biometric information measurement period and an inaccurate pulse wave signal detection process.

[0138] refer to Fig. 9 , the main driving circuit 200 performs a preset signal processing process for the photosensitive signal, such as amplification, filtering and sampling of the photosensitive signal detected by the photosensitive pixel LSP at the position touched by the body part (such as the finger F, etc.). Then, a pulse wave signal PPG corresponding to the amplitude of the signal-processed photosensitive signal and the change of its amplitude is generated.

[0139] The main driving circuit 200 analyzes the high pulse amplitude change and the low pulse amplitude change of the pulse wave signal PPG generated in real time, and calculates the average amplitude value RFH of the high pulse and the average amplitude value RFL of the low pulse in real time. Then, the main driving circuit 200 sets a normal pulse wave signal detection period or an inaccurate pulse wave signal detection period in real time according to the comparison analysis results of the average amplitude value RFH of the high pulse and the preset high threshold value ThH and the average amplitude value RFL of the low pulse and the preset low threshold value ThL.

[0140] For example, when the average amplitude value RFH of the high pulse detected during multiple preset frame periods is greater than or equal to the preset high threshold value ThH, the main driving circuit 200 sets a normal pulse wave signal detection period. In addition, when the average amplitude value RFL of the low pulse detected during multiple preset frame periods is greater than the preset low threshold value ThL, the main driving circuit 200 can set a normal pulse wave signal detection period.

[0141] Alternatively, when a period in which the pulse wave signal PPG generated in real time is interrupted is detected, the main driving circuit 200 sets an inaccurate pulse wave signal detection period in real time. In addition, when the average amplitude value RFH of the high pulse detected during a plurality of preset frame periods is less than the preset high threshold ThH, the main driving circuit 200 sets an inaccurate pulse wave signal detection period. In addition, when the average amplitude value RFL of the low pulse detected during a plurality of preset frame periods is less than the preset low threshold ThL, the main driving circuit 200 may set an inaccurate pulse wave signal detection period.

[0142] Fig.10 is a diagram showing an image display screen shown when an inaccurate pulse wave signal is detected during a biometric information measurement period.

[0143] like Fig.10 As shown in , the main driving circuit 200 can display the waveform of the pulse wave signal detected in real time as a graphic picture on the display window of the application program, so that the user can check the pulse wave signal detected in real time during the inaccurate pulse wave signal detection period.

[0144] During the inaccurate pulse wave signal detection period, the main driving circuit 200 displays a touch guide message on the application screen so that the body part (such as finger F, etc.) can be accurately touched and can maintain the touch state. In this case, the pulse wave signal and touch guide message displayed in real time can be changed to a warning color such as red and displayed.

[0145] Fig.11 is a flowchart illustrating a method of measuring biometric information according to an embodiment of the present disclosure.

[0146] refer to Fig.11 During the period of detecting biometric information, the main driving circuit 200 displays the biometric information measuring area FSA of the body part such as the finger F as a guide screen for detecting a pulse wave signal and guides the pulse wave signal detection process (step SS1).

[0147] The main driving circuit 200 receives the touch position coordinates detected by the touch sensing unit TSU or the pressure sensing unit PSU through the touch driving circuit 400 (step SS2 ).

[0148] The main driving circuit 200 provides a data voltage to the first unit pixel PG1 and the second unit pixel PG2 arranged at the finger touch position in the biometric information measurement area FSA, and provides a control signal to the display scan driver 110 and the photosensitive scan driver 120. The main driving circuit 200 can provide a preset data voltage to at least one of the first display pixel SP1 and the second display pixel SP2 included in the first unit pixel PG1 and the second unit pixel PG2, so that a light signal can be detected by at least one of green light and red light. Then, the main driving circuit 200 receives a light signal, for example, a photosensitive signal, from each photosensitive pixel LSP through the photosensitive light line ERL of the display panel 100. The main driving circuit 200 detects a pulse wave signal (PPG signal) corresponding to the photosensitive signal received in real time (step SS3).

[0149] Fig.12 is a waveform diagram showing a sensing scan signal and a reset signal input to a first display pixel and a photosensitive pixel of a display pixel according to an embodiment.

[0150] Fig.12 The diagram shows a kth emission control signal EMk applied to the kth emission control line VLk, a kth display initialization signal GIk applied to the kth display initialization line GILk, a kth display control signal GCk applied to the kth display control line GCLk, a kth display scan signal GWk applied to the kth display scan line GLk, a pth reset signal RSTp applied to the nth sensing reset line RELn, and a pth sensing scan signal FSp applied to the nth photosensitive scan line FSLn during the (N-1)th frame period FN-1 and the Nth frame period FN in a period of detecting and measuring biometric information (e.g., a biometric information measurement period).

[0151] The pth reset signal RSTp applied to the nth sensing reset line RELn controls on-off of the third sensing transistor RT3 , and the pth sensing scan signal FSp applied to the nth light sensing scan line FSLn controls on-off of the second sensing transistor RT2 .

[0152] The pth reset signal RSTp is generated as the second level voltage V2 during the first period t1, and is generated as the first level voltage V1 during the second period t2 and the third period t3. In addition, the pth sensing scan signal FSp is generated as the first level voltage V1 during the second period t2, and is generated as the second level voltage V2 during the first period t1 and the third period t3. The pth sensing scan signal FSp may be applied at the same timing as the kth display scan signal GWk. The photosensitive signal of the photosensitive element PD may be output in response to the pth sensing scan signal FSp.

[0153] During the first period t1, the pth reset signal RSTp of the second level voltage V2 is provided to the gate electrode of the third sensing transistor RT3. Therefore, the third sensing transistor RT3 is turned on by the pth reset signal RSTp of the second level voltage V2, thereby resetting the second electrode of the photosensitive element PD to the reset voltage source VRST. The pth sensing scan signal FSp having the second level voltage V2 is provided to the gate electrode of the second sensing transistor RT2. The second sensing transistor RT2 is turned off by the pth sensing scan signal FSp having the second level voltage V2.

[0154] During the second period t2 and the third period t3, the pth reset signal RSTp of the first level voltage V1 is provided to the gate electrode of the third sensing transistor RT3. Therefore, the third sensing transistor RT3 maintains a cut-off state. During the second period t2, the pth sensing scanning signal FSp of the first level voltage V1 is provided to the gate electrode of the second sensing transistor RT2. Therefore, the second sensing transistor RT2 can be turned on during the second period t2, and the third sensing transistor RT3 can be turned off during the second period t2 and the third period t3. For example, during the third period t3, the voltage of the sensing anode electrode of the photosensitive element PD can increase according to the light incident from the front. At this time, the main driving circuit 200 receives a light signal, for example, a photosensitive signal, from each of the photosensitive pixels LSP through the photosensitive light ERL of the display panel 100 during the third period t3. The main driving circuit 200 detects a pulse wave signal (PPG signal) corresponding to the photosensitive signal received in real time (step SS3).

[0155] The main driving circuit 200 analyzes the high pulse amplitude change and the low pulse amplitude change of the pulse wave signal PPG generated in real time, and calculates the average amplitude value RFH of the high pulse and the average amplitude value RFL of the low pulse in real time. Then, the main driving circuit 200 sets a normal pulse wave signal detection period or an inaccurate pulse wave signal detection period in real time according to the comparison analysis results of the average amplitude value RFH of the high pulse and the preset high threshold ThH and the average amplitude value RFL of the low pulse and the preset low threshold ThL. When a period in which the pulse wave signal PPG generated in real time is interrupted is detected, the main driving circuit 200 sets an inaccurate pulse wave signal detection period in real time. When the average amplitude value RFH of the high pulse is detected to be lower than the preset high threshold ThH, or when the average amplitude value RFL of the low pulse is detected to be lower than the preset low threshold ThL, the main driving circuit 200 sets an inaccurate pulse wave signal detection period in real time (step SS5).

[0156] During the inaccurate pulse wave signal detection period, the main driving circuit 200 displays a touch guide message on the application screen so that the body part (such as finger F, etc.) can be accurately touched and the touch state can be guided (step SS6).

[0157] Fig.13 is an image diagram showing a state in which a pulse wave signal is inaccurately detected during a biometric information measurement period.

[0158] refer to Fig.13 , the main driving circuit 200 performs a preset signal processing process on the photosensitive signal detected by the photosensitive pixel LSP at the position touched by the body part (such as the finger F, etc.). In addition, the main driving circuit 200 generates an image (OPD image) based on the photosensitive signal value detected by the photosensitive pixel LSP and the arrangement position of the photosensitive pixel LSP outputting the photosensitive signal. Then, the touch area or touch shape is analyzed based on the signal value detected by the photosensitive pixel LSP, the arrangement position of the photosensitive pixel LSP, the image, etc.

[0159] like Fig.13 As shown in image “(a)”, image “(b)”, and image “(c)”, when the touch area becomes smaller than the preset reference area, it can be determined to cause inaccurate pulse wave signal detection. Therefore, during the inaccurate pulse wave signal detection period, the main driving circuit 200 can repeatedly display the touch guide message on the application screen so that the body part (such as finger F, etc.) can be accurately touched, and the touch state can be guided, thereby guiding the body part touch area to become wider (step SS7).

[0160] Alternatively, the main driving circuit 200 may generate a capacitance (Cap) distribution of a signal value based on a signal value detected by a photosensitive pixel LSP. In addition, the main driving circuit 200 analyzes a touch area or a touch shape based on a signal value detected by a photosensitive pixel LSP, an arrangement position of a photosensitive pixel LSP outputting a photosensitive signal, and an image. Then, the touch area or the touch shape is analyzed based on a capacitance (Cap) distribution detected by a photosensitive pixel LSP.

[0161] like Fig.13 As shown in the image "(b)" in FIG. 2 , when the touch area becomes smaller than the reference area, an inaccurate pulse wave signal detection period can be set. Similarly, during the inaccurate pulse wave signal detection period, the main drive circuit 200 can also display a touch guide message on the application screen so that the body part (such as finger F, etc.) can be accurately touched, and the touch state can be guided, thereby guiding the body part touch area to become wider (step SS7).

[0162] Fig.14 is a waveform diagram showing pressure changes measured in real time during a biometric information measurement period.

[0163] refer to Fig.14, the touch drive circuit 400 provides a reference voltage to the lower electrode of the pressure sensing unit PSU, and receives a pressure sensing signal from its upper electrode, thereby sensing the change in the self-capacitance of the pressed area using the pressure sensing signal. Therefore, the touch drive circuit 400 generates pressure data according to the change in the self-capacitance of the area pressed by the body part and the sensing coordinate data of the position of the sensed touch, and provides the generated data to the main drive circuit 200.

[0164] The main driving circuit 200 analyzes the touch pressure and the touch shape based on the pressure data and the detection coordinate data of the pressure sensing position. When the touch pressure decreases below the preset reference pressure or the touch area according to the touch shape becomes smaller than the reference area, the main driving circuit 200 determines it as causing inaccurate pulse wave signal detection. Therefore, during the inaccurate pulse wave signal detection period, the main driving circuit 200 displays a pressure guidance message on the application screen so that the touch state of the body part (such as finger F) can be accurately touched and pressed stronger than the reference pressure, thereby guiding the body part touch area to become wider (step SS7).

[0165] Even after the touch guide message or the pressure guide message is displayed on the application screen, the main driving circuit 200 analyzes the pulse amplitude variation of the pulse wave signal PPG generated in real time to determine whether a normal pulse wave signal is detected or an inaccurate pulse wave signal is detected (step SS8).

[0166] When an inaccurate pulse wave signal detection period is set and maintained even after the touch guide message or the pressure guide message is displayed on the application screen, the main driving circuit 200 increases the voltage amplitude of the data voltage by a preset step size to increase the light emitting brightness of the display pixel SP and the infrared light emitting pixel ISP, and provides it to the data line DL of the display pixel SP and the infrared light emitting pixel ISP. For example, the main driving circuit 200 may increase the data voltage by 0.1V to 0.5V in at least one frame unit, and provide it to the data line DL of the display pixel SP and the infrared light emitting pixel ISP (step SS9).

[0167] Fig.15 1 is a waveform diagram showing an embodiment of a modified example of a sensing signal and a reset signal input to a first display pixel and a photosensitive pixel of a display pixel.

[0168] refer to Fig.15 During the inaccurate pulse wave signal detection period, the main driving circuit 200 increases the number of detections of the photosensitive pixels LSP to gradually increase the number of detections (or detection timing) of the photosensitive signals step by step in units of at least one frame period.

[0169] For example, in order to increase the number of second sensing transistors RT2 of the photosensitive pixel LSP that are turned on during at least one frame period, the main driving circuit 200 increases the number of pth sensing scan signals FSp generated as the first level voltage V1 (turn-on voltage) provided during the second period t2 and the third period t3 of each frame period, and provides the pth sensing scan signal FSp to the nth photosensitive scan line FSLn.

[0170] The main driving circuit 200 can increase the number of p-th sensing scan signals FSp generated as the first level voltage V1 (on-state voltage) to 2 times, 3 times, 4 times, 5 times or more to increase the number of light detections of the photosensitive pixels LSP by at least one frame period, and provide the p-th sensing scan signal FSp to the n-th photosensitive scan line FSLn (step SS9).

[0171] In addition, during the inaccurate pulse wave signal detection period, the main driving circuit 200 gradually increases and provides the voltage amplitude of the pth sensing scanning signal FSp to turn on the second sensing transistor RT2 of the photosensitive pixel LSP, so as to gradually change the driving voltage condition of the photosensitive pixel LSP in units of at least one frame period.

[0172] For example, the main driving circuit 200 may increase the voltage level of the p-th sensing scanning signal FSp by 0.1V to 0.5V at least in units of one frame, and provide the p-th sensing scanning signal FSp to the n-th light-sensing scanning line FSLn, so that the voltage amplitude of the p-th sensing scanning signal FSp that turns on the second sensing transistor RT2 of the light-sensing pixel LSP increases at least in units of one frame period. At this time, the voltage level of the p-th sensing scanning signal FSp may increase by 0.1V to 0.5V at least in units of one frame to be greater than the first level voltage V1 (turn-on voltage), and be provided to the n-th light-sensing scanning line FSLn (step SS9).

[0173] Even in the process of changing the driving condition of the photosensitive pixel LSP, the main driving circuit 200 analyzes the pulse amplitude variation of the pulse wave signal PPG generated in real time to confirm whether a normal pulse wave signal or an inaccurate pulse wave signal is detected (step SS10 ).

[0174] Fig.16 2 is a diagram showing an image display screen showing an accurate pulse wave signal detection state by a mobile display device. Fig.17 is a diagram showing an image display screen showing an accurate pulse wave signal detection state by a watch-type display device.

[0175] refer to Fig.16 and Fig.17During the period of detecting biometric information based on normal pulse wave signal detection, the main driving circuit 200 displays the period required for measuring biometric information, the pulse wave signal detection period and the biometric information measurement area FSA, etc. in the form of a circular graph or a bar graph through the application screen (step SS11).

[0176] When a normal pulse wave signal detection cycle is set according to the detection results of the average amplitude value RFH of the high pulse and the average amplitude value RFL of the low pulse, the main driving circuit 200 displays a normal touch guide message on the application screen so that the normal touch state can be maintained. At this time, the pulse wave signal and the touch guide message displayed in real time can be changed and displayed as a normal progress color such as green, blue, etc.

[0177] The main driving circuit 200 receives the touch position coordinates sensed by the touch sensing unit TSU or the pressure sensing unit PSU using the touch driving circuit 400. Then, the main driving circuit 200 provides the data voltage to the first unit pixel PG1 and the second unit pixel PG2 arranged at the portion of the biometric information measurement area FSA touched by the finger F, and provides the control signal to the display scanning driver 110 and the photosensitive scanning driver 120. At this time, the main driving circuit 200 can provide a preset data voltage to at least one of the first display pixel SP1 and the second display pixel SP2 included in the first unit pixel PG1 and the second unit pixel PG2, so that the light signal can be detected by at least one of the green light and the red light. Thereafter, the main driving circuit 200 receives the light signal, for example, the photosensitive signal, from the photosensitive pixel LSP through the photosensitive light line ERL of the display panel 100.

[0178] The main driving circuit 200 detects a pulse wave signal (PPG signal) corresponding to the photosensitive signal received in real time and stores them as digital signal data. The pulse wave signal is a signal corresponding to the amplitude of the photosensitive signal and the change of its amplitude. The main driving circuit 200 displays the detected pulse wave signal in real time on the display window of the application screen in the form of a graphic type of graphic.

[0179] Fig.18 is a diagram illustrating a method for calculating blood pressure information among biometric information according to an embodiment.

[0180] refer to Fig.18During systole, blood discharged from the left ventricle of the heart moves to peripheral tissues, and thus the amount of blood in the arterial side increases. In addition, when the heart contracts, red blood cells carry more oxygenated hemoglobin to the peripheral tissues. When the heart relaxes, the heart receives a partial influx of blood from the peripheral tissues. When light is irradiated to the peripheral blood vessels, the light is absorbed by the peripheral tissues. The light absorption rate depends on the hematocrit and the blood volume. When the heart contracts, the light absorption rate may have a maximum value, and when the heart relaxes, the light absorption rate may have a minimum value. Therefore, when the heart contracts, the light sensed by the photosensitive element PD may be the smallest, and when the heart relaxes, the light sensed by the photosensitive element PD may be the largest.

[0181] In addition, when the user places a finger F on the display panel 100 in the blood pressure measurement mode and lifts it off, the force (contact force) applied to the pressure sensing unit PSU may gradually increase to reach a maximum value, and then may gradually decrease. When the contact force increases, the blood vessels may narrow, resulting in no blood flow. When the contact force decreases, the blood vessels dilate, and thus the blood flows again. Further reduction in the contact force results in greater blood flow. Therefore, the change in the amount of light sensed by the photosensitive pixel LSP may be proportional to the change in blood flow. Therefore, the main drive circuit 200 generates a pulse wave signal PPG according to the pressure applied by the user and the light signal (PPG signal ratio) according to the amount of light sensed by the photosensitive element PD based on the pressure data value calculated and digitally converted by the pressure sensing unit PSU (ADC of the pressure sensing unit PSU). The pulse wave signal PPG may have a waveform that vibrates according to the cardiac cycle.

[0182] The main driving circuit 200 can estimate the blood pressure of the blood vessels of the finger F based on the time difference between the time point PKT corresponding to the peak value PK of the calculated pulse wave signal PPG and the time point corresponding to the peak value of the filtered pulse wave. For example, the main driving circuit 200 can calculate the pulse wave signal PPG during the preset periods T1 and T2 before and after the time point PKT corresponding to the peak value PK of the calculated pulse wave signal PPG, and can detect the blood pressure based on the difference between the pulse wave signals PPG. Among the estimated blood pressure values, the maximum blood pressure value can be determined as the systolic blood pressure value, and the minimum blood pressure value can be determined as the diastolic blood pressure value. In addition, the estimated blood pressure values ​​can be used to calculate additional blood pressure values ​​such as the average blood pressure value.

[0183] Fig.19 is a diagram illustrating a method for calculating information on heart rate and respiration among biometric information according to an embodiment. Fig. 20 is a diagram showing a heart rate variability change state measured in real time by feeding back the heart rate variability change state to a mobile display device and a watch type display device as an application screen.

[0184] refer to Fig.19 and Fig. 20 The main driving circuit 200 can use a machine learning algorithm to learn the signal characteristics (e.g., signal feature points) of the pulse wave signal PPG, and can detect information about the blood pressure BP based on the signal characteristic change rate of the pulse wave signal PPG.

[0185] For example, the main driving circuit 200 sets an initial value or reference value for each of the pulse width (f1, for example, systolic and diastolic cycles), amplitude (f2, for example, systolic blood pressure), pulse width of the systolic cycle (f3, for example, systolic cycle), and pulse width of the diastolic cycle (f4, for example, diastolic cycle) of each of the pulse wave signal PPG. Thereafter, compared to the initial value or reference value of each of the features, the main driving circuit 200 detects changes in the features of the pulse wave signal PPG input in real time, for example, the amplitude of changes in the systolic and diastolic cycles, the change in systolic blood pressure, the change in the systolic cycle, and the change in the diastolic cycle, and stores them in a database as learning data. Compared to the initial value or reference value of each of the features, the main driving circuit 200 can output information about the blood pressure BP according to the characteristic change rate or the amplitude of the change of the pulse wave signal PPG.

[0186] The above-mentioned method for measuring blood pressure is merely an example, and various other methods are disclosed in Korean Patent Application Publication No. 10-2018-0076050, Korean Patent Application Publication No. 10-2017-0049280, and Korean Patent Application Publication No. 10-2019-0040527, the disclosures of which are incorporated herein by reference in their entirety.

[0187] The main driving circuit 200 samples the pulse wave signal PPG during a predetermined sampling period before and after a time point PKT corresponding to a peak value PK of the pulse wave signal PPG, and detects a high pulse generation period HT of the sampled pulse wave signal PPG. In addition, the number of high pulses generated within a predetermined reference period (e.g., 60 seconds) may be counted for the sampled pulse wave signal PPG to detect biometric information about the heart rate cycle and the heart rate HR.

[0188] In addition, the main driving circuit 200 detects the heart rate cycle and the heart rate cycle variation t1 to t4 of the peak value PK of the pulse wave signal PPG for the high pulse of each preset reference cycle to detect the heart rate variability HRV according to the heart rate cycle variation rate.

[0189] In addition, the main driving circuit 200 sequentially detects the generation cycle and amplitude value of the low pulse of the sampled pulse wave signal PPG. Then, the change cycle of the amplitude value dcs of the low pulse can be detected in units of a preset reference cycle (for example, 60 seconds) to detect the breathing change state and breathing frequency RR of the user. At this time, the cycle in which the amplitude value dcs of the low pulse increases and the cycle in which the amplitude value dcs of the low pulse decreases can be analyzed to detect the breathing change state and breathing frequency RR of the user using the increase cycle and decrease cycle of the amplitude value dcs of the low pulse.

[0190] refer to Fig. 20 The main driving circuit 200 displays at least one of the biometric information detected in real time on the application screen, for example, at least one of the biometric information such as blood pressure BP, heart rate HR, heart rate variability HRV, and respiratory rate RR.

[0191] Based on the user's option selection, the main driving circuit 200 may display at least one of the biometric information detected in real time as a linear graphic image, text on a table, or various forms such as a bar graph.

[0192] Fig.21 is a diagram illustrating a method for calculating respiratory frequency and respiratory timing information in biometric information according to an embodiment.

[0193] The main driving circuit 200 may display a notification screen for displaying the user's breathing frequency and breathing timing information on the display window during the biometric information measurement period by feeding the user's breathing frequency and breathing timing information back to the user motion guide program.

[0194] While executing the user action guidance program, the main drive circuit 200 sequentially detects the generation cycle of the low pulse and the amplitude value of the low pulse with respect to the pulse wave signal PPG, and analyzes the cycle in which the amplitude value dcs of the low pulse increases and the cycle in which the amplitude value dcs of the low pulse decreases to detect the breathing timing information (e.g., inhalation and exhalation state information) and the respiratory rate RR. In addition, the breathing change state and the respiratory rate RR detected in real time are displayed as text on the display window of the biometric information notification screen. At this time, the breathing change state and the respiratory rate RR can be output as sound. Therefore, the user can adjust the respiratory rate and breathing timing by referring to the respiratory rate RR and the breathing change state displayed in the application screen and the real-time audio.

[0195] Fig. 22 is a diagram illustrating a method for calculating information on blood vessel elasticity in biometric information according to an embodiment.

[0196] refer to Fig. 22The main driving circuit 200 can set and obtain the blood vessel elasticity BVE by expanding and analyzing the high pulse changes of the sampled pulse wave signal PPG.

[0197] When the blood flow increases due to the heartbeat, the pulse wave signal PPG changes to a high pulse form, and when the blood flow decreases, the pulse wave signal PPG changes to a low pulse form again. If the blood flow changes rapidly due to the shape of the blood vessel during the period in which the blood flow increases or decreases, the change in blood flow may be quickly relaxed or slowed down according to the elasticity of the blood vessel. Therefore, the main driving circuit 200 sets and obtains the blood vessel elasticity BVE by expanding and analyzing the high pulse change form of the pulse wave signal PPG using a value corresponding to the change amplitude of the high pulse.

[0198] Fig.23 is a diagram illustrating a method for calculating information on cardiovascular diseases in biometric information according to an embodiment.

[0199] refer to Fig.23 , the main driving circuit 200 can set and obtain the cardiovascular disease assessment score (or cardiovascular health analysis result score) by differentiating, expanding and analyzing the high pulse variation form of the sampled pulse wave signal PPG. For example, the main driving circuit 200 detects the period (peak time) in which the pulse wave signal PPG reaches the peak value PK in the form of a high pulse and the time change ΔT in which the pulse wave signal PPG decreases compared to the period (peak time) in which the pulse wave signal PPG reaches the peak value PK. As the period (peak time) in which the pulse wave signal PPG reaches the peak value PK in the form of a high pulse increases, the risk of heart disease increases. Therefore, the main driving circuit 200 can set and obtain the cardiovascular disease assessment score (or cardiovascular health analysis result score) inversely proportional to the period (peak time) in which the pulse wave signal PPG reaches the peak value PK in the form of a high pulse.

[0200] Fig.24 is a diagram illustrating a method for calculating information on oxygen saturation in biometric information according to an embodiment.

[0201] refer to Fig.24 When the heart contracts, red blood cells carry more oxygenated hemoglobin to peripheral tissues. When the heart relaxes, the heart receives a partial inflow of blood from peripheral tissues. Using this, the main driving circuit 200 uses the amplitude change of the pulse wave signal PPG detected by green light to detect the deoxyhemoglobin (Hb) value, and uses the amplitude change of the pulse wave signal PPG detected by red light to detect the HbO 2 (oxygenated hemoglobin) value.

[0202] The main driving circuit 200 can use the following equation (2) to detect the oxygen saturation (SpO 2).

[0203] SpO 2 =HpO 2 / SpO 2 +Hb..................(2)

[0204] The main driving circuit 200 can display biometric information on the application screen, such as blood pressure BP, heart rate HR, heart rate variability HRV, respiratory rate RR, vascular elasticity BVE, cardiovascular disease (or cardiovascular health analysis result score), oxygen saturation (SpO 2 )wait.

[0205] Fig.25 is a diagram showing the results of measuring biometric information by a mobile display device and a watch-type display device.

[0206] refer to Fig.25 The display device 10 for measuring biometric information such as blood pressure BP, heart rate HR, heart rate variability HRV, respiratory rate RR, vascular elasticity BVE, cardiovascular disease, oxygen saturation, etc. can be applied to mobile communication terminals such as smart phones, flat panel display devices, etc. Fig.17 As shown in , the display device 10 for measuring biometric information according to an embodiment of the present disclosure can be similarly applied to wearable devices such as smart watches, watch phones, etc.

[0207] The main driving circuit 200 applied to a mobile communication terminal or a wearable device selects a more accurate pulse wave signal PPG detected during a normal pulse wave signal detection period, and measures at least one of the biometric information. The main driving circuit 200 analyzes the high pulse period and high pulse period variation, high pulse amplitude and variation thereof, low pulse amplitude and variation thereof, signal waveform variation, period of high pulse peak value, difference in pulse amplitude of the pulse wave signal PPG detected by green light and red light, etc. of the pulse wave signal PPG detected during the normal pulse wave signal detection period. Then, biometric information such as blood pressure BP, heart rate HR, heart rate variability HRV, respiratory rate RR, vascular elasticity BVE, cardiovascular disease (or cardiovascular health analysis result score), oxygen saturation, etc. is obtained according to the analysis result, and the obtained result is displayed on the application screen.

[0208] At the conclusion of the detailed description, those skilled in the art will appreciate that many variations and modifications can be made to the preferred embodiment without substantially departing from the principles of the present disclosure.

Claims

1. Display equipment, including: The display panel comprises a display area, wherein the display area comprises a plurality of display pixels and a plurality of photosensitive pixels; a display scan driver configured to drive the display pixels to emit light; A light-sensitive scanning driver configured to drive the light-sensitive pixels to sense light; as well as a main driving circuit configured to detect a pulse wave signal and measure biometric information using the photosensitive signal received by the photosensitive pixel, Wherein, the main driving circuit is configured to determine a normal pulse wave signal detection period or an inaccurate pulse wave signal detection period at the start period of biometric information measurement, change the detection condition of the pulse wave signal during the inaccurate pulse wave signal detection period, and re-detect the pulse wave signal during the normal pulse wave signal detection period and re-measure the biometric information.

2. The display device according to claim 1, wherein: The main driving circuit is configured as follows: displaying a touch sensing area of ​​a body part through an application screen in the display area; Displaying the waveform of the pulse wave signal detected in real time on a display window of the application screen; as well as The period in which the pulse wave signal is detected and the pulse wave signal detection period required for the measurement of the biometric information are displayed in the form of a circular graph or a bar graph.

3. The display device according to claim 2, wherein: The main driving circuit is configured as follows: generating the pulse wave signal corresponding to the amplitude and amplitude variation of the light-sensitive signal; Analyze the high pulse amplitude change and the low pulse amplitude change of the pulse wave signal in real time to calculate the average amplitude value of the high pulse and the average amplitude value of the low pulse in real time; as well as According to the comparison result of the average amplitude value of the high pulse and the preset high threshold value and the comparison result of the average amplitude value of the low pulse and the preset low threshold value, the normal pulse wave signal detection period or the inaccurate pulse wave signal detection period is set in real time.

4. The display device according to claim 3, wherein: The main driving circuit sets the inaccurate pulse wave signal detection period when the pulse wave signal is not generated and interrupted, or when the average amplitude value of the high pulse detected during multiple preset frame periods is less than the preset high threshold, or when the average amplitude value of the low pulse detected during multiple preset frame periods is less than the preset low threshold.

5. The display device according to claim 4, wherein: The main driving circuit is configured to display a touch guidance message on the application screen during the inaccurate pulse wave signal detection period, so that the body part is accurately touched and the touch state is maintained, and the waveform of the pulse wave signal and the touch guidance message displayed on the display window are changed to a red warning color in real time.

6. The display device according to claim 5, wherein: The main driving circuit is configured to display a touch guide message on the application screen when the normal pulse wave signal detection cycle is set, so that the touch state remains "normal", and the waveform of the pulse wave signal and the touch guide message displayed in real time on the display window are changed to a normal progress color of green or blue.

7. The display device according to claim 6, wherein: The main driving circuit is configured to analyze the high pulse period and the change in the high pulse period, the high pulse amplitude and the change in the high pulse amplitude, the low pulse amplitude and the change in the low pulse amplitude, the waveform change of the high pulse, the period in which the high pulse reaches a peak, and the difference in the pulse amplitude of the pulse wave signal detected by green light and red light respectively, of the pulse wave signal detected during the normal pulse wave signal detection period, and to derive at least one biometric information of blood pressure, heart rate, heart rate variability, respiratory rate, vascular elasticity, whether cardiovascular disease occurs, and oxygen saturation, and display the derived biometric information through the application screen.

8. The display device according to claim 3, wherein: The main drive circuit is configured to generate an image based on the photosensitive signal value detected by the photosensitive pixel and the arrangement position of the photosensitive pixel that outputs the photosensitive signal during the inaccurate pulse wave signal detection cycle, and when the touch area derived from the photosensitive signal value and the image is smaller than a preset reference area on the application screen, a touch guidance message is displayed so that the body part is accurately touched and the touch state is guided.

9. The display device according to claim 3, wherein: The main driving circuit is configured to generate a capacitance distribution of the signal value based on the signal value detected by the photosensitive pixel during the inaccurate pulse wave signal detection period, analyze the touch area or touch shape based on the arrangement position of the photosensitive pixel that outputs the photosensitive signal and the capacitance distribution, and display a touch guide message when the touch area is smaller than a preset reference area on the application screen, so that the body part is accurately touched and the touch state is guided.

10. The display device according to claim 8, wherein: The main driving circuit is configured to receive pressure data of the area pressed by the body part and sensed coordinate data of the position of the sensed pressure through the touch driving circuit, analyze the touch pressure and the touch shape based on the pressure data and the sensed coordinate data of the position of the sensed pressure, and when the touch pressure decreases to below a preset reference pressure or the touch area according to the touch shape is smaller than a reference area, display a pressure guidance message about the body part on the application screen.

11. The display device according to claim 8, wherein: The main driving circuit is configured to increase the voltage amplitude of the data voltage by a preset step size during the inaccurate pulse wave signal detection period to increase the luminous brightness of the display pixel or the infrared light-emitting pixel, and provide the data voltage to the data line of the display pixel or the infrared light-emitting pixel.

12. The display device according to claim 8, wherein: The main driving circuit is configured to increase the number of sensing scan signals provided in the inaccurate pulse wave signal detection period by at least one frame period, so that the detection number of the photosensitive pixels increases by at least one frame period, and provide the sensing scan signals to the photosensitive scan lines connected to the photosensitive pixels.

13. The display device according to claim 8, wherein: The main driving circuit is configured to gradually increase a voltage amplitude of a sensing scanning signal that turns on a sensing transistor of the photosensitive pixel during the inaccurate pulse wave signal detection period, and provide the sensing scanning signal to a photosensitive scanning line connected to the sensing transistor.

14. Display equipment, including: The display panel comprises a display area, wherein the display area comprises a plurality of display pixels, a plurality of light-sensitive pixels and a plurality of infrared light-emitting pixels; a display scan driver configured to drive the display pixels to emit light; A light-sensitive scanning driver configured to drive the light-sensitive pixels to sense light; a touch sensing unit disposed on the front surface of the display panel and configured to sense a touch and output a touch sensing signal; A touch driving circuit configured to generate touch data and touch coordinate data according to the amplitude change and output position of the touch sensing signal; as well as a main driving circuit configured to detect a pulse wave signal and measure biometric information using a light-sensing signal received by the light-sensing pixel, Wherein, the main driving circuit is configured to determine a normal pulse wave signal detection period or an inaccurate pulse wave signal detection period at the start period of biometric information measurement, change the detection condition of the pulse wave signal during the inaccurate pulse wave signal detection period, and re-detect the pulse wave signal during the normal pulse wave signal detection period and re-measure the biometric information.

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