Near-infrared light organic sensors, embedded organic light emitting diode panels, and display devices including the same

An OLED panel may be embedded with a near-infrared organic photosensor and may be configured to implement biometric recognition without an effect on an aperture ratio of an OLED emitter. The OLED panel may include a substrate, an OLED stack on the substrate and configured to emit visible light, and an NIR light sensor stack between the substrate and the OLED stack and including an NIR emitter configured to emit NIR light and an NIR detector. The OLED panel may be included in one or more various electronic devices.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to and the benefit, under 35 U.S.C. § 119, of Korean Patent Application No. 10-2017-0084947 filed in the Korean Intellectual Property Office on Jul. 4, 2017, the entire contents of which are incorporated herein by reference.

BACKGROUND

Organic light emitting diode (OLED) panels and display devices including the same are disclosed. More particularly, the present disclosure relates to organic light emitting diode (OLED) panels embedded with near-infrared organic photosensors configured to implement biometric recognition, and mobile devices including the same.

2. Description of the Related Art

Organic light emitting diode (OLED) display devices have merits of excellent luminance, driving voltage, and response speed characteristics and implementing color images, so they are being employed for (e.g., are included in) various display devices.

Meanwhile, recently, display devices have increasingly implemented biometric technologies via which certain biometric information or gesture information is extracted by an automatic device to authenticate a person in financial, health care, and mobile fields. Particularly, leading smartphone companies are focusing on adapting fingerprint and iris recognition technologies.

Since Apple took over AuthenTech, which was a manufacturer of semiconductive sensors for finger scans, they (Apple) have been consistently mounting fingerprint sensors in iPhones® and iPads®. US 2015-0331508 also discloses technology of forming a near-infrared sensor for fingerprint recognition on the same plane as an OLED emitter. However, since a near-infrared emitter and a near-infrared detector for fingerprint recognition are formed on the same plane as the OLED emitter in US 2015-0331508, an aperture ratio of the OLED emitter relative to a conventional OLED emitter having no fingerprint sensor is decreased. The aperture ratio decrease of the OLED emitter may have a large influence on display characteristics of a mobile display device, particularly, a smart phone having a small display area.

SUMMARY

Some example embodiments provide an OLED panel embedded with a near-infrared organic photosensor configured to implement biometric recognition without an effect on an aperture ratio of an OLED emitter.

Some example embodiments provides a display device including an OLED panel embedded with a near-infrared organic photosensor for implementing biometric recognition without an effect on an aperture ratio of an OLED emitter.

According to some example embodiments, an OLED panel embedded with a near-infrared organic photosensor includes plurality of OLED pixels, the plurality of OLED pixels including a substrate, an OLED stack disposed on the substrate and emitting visible light, and an NIR light sensor stack disposed between the substrate and the OLED stack and including an NIR emitter emitting NIR light and an NIR detector.

The OLED panel according to some example embodiments may maintain 100% of an opening part of the OLED emitter by forming the near-infrared organic photosensor and the OLED emitter as a stack structure and thus display characteristics.

In addition, the near-infrared organic photosensor beneath the OLED emitter may effectively perform biometrics by using a near infrared ray.

Furthermore, the near-infrared organic photosensor is formed of an organic material and thus may be bent or elastic. Accordingly, the near-infrared organic photosensor may contribute to easily realizing a flexible display device and thus improve portability and versatility of a display device.

According to some example embodiments, an Organic Light Emitting Diode (OLED) panel embedded with a Near Infrared (NIR) light sensor may include a substrate, an OLED stack on the substrate, the OLED stack configured to emit visible light, and an NIR light sensor stack between the substrate and the OLED stack. The NIR light sensor stack may include an NIR emitter configured to emit NIR light and an NIR detector, such that the NIR light sensor includes the NIR emitter and the NIR detector.

At least one element of the NIR emitter and the NIR detector may be in a given OLED pixel of the plurality of OLED pixels.

Both the NIR emitter and the NIR detector may be in one or more sub-pixels of an OLED pixel, while neither of any NIR emitter or any NIR detector may be in one or more other sub-pixels of the OLED pixel.

The NIR emitter and the NIR detector may be on a non-light-emitting portion of an OLED pixel, the non-light emitting portion between at least two proximate sub-pixels of the OLED pixel.

The OLED stack may be configured to emit light away from the NIR light sensor stack.

The OLED emitter of the OLED stack may be an organic light emitting diode (OLED) including an organic emission layer and a plurality of electrodes on opposite surfaces of the organic emission layer, such that a first electrode of the plurality of electrodes is under the organic emission layer and a second electrode of the plurality of electrodes is over the organic emission layer. The second electrode may include a transparent electrode.

Both of the NIR emitter and the NIR detector may be in one or more sub-pixels of an OLED pixel, while neither of any NIR emitter or any NIR detector may be in one or more other sub-pixels of the OLED pixel, and the first electrode may include a separate transparent electrode.

The NIR emitter and the NIR detector may be on the non-light-emitting portion between proximate sub-pixels of an OLED pixel, and the first electrode may include a reflective electrode.

The OLED panel may further include a driver between the substrate and the NIR light sensor stack, the driver configured to input and output electrical signals of each of the NIR light sensor stack and the OLED stack.

A driver configured to input and output an electrical signal from the NIR light sensor stack and a driver configured to input and output an electrical signal from the OLED stack may be on a substantially common plane.

The NIR emitter may be an NIR organic photodiode that is configured to emit NIR light of a wavelength spectrum of about 800 nm to about 1500 nm.

The NIR organic photodiode includes an organic emission layer configured to emit the NIR light and lower and upper electrodes on opposite surfaces of the organic emission layer, respectively, and the upper electrode may be a transparent electrode and the lower electrode is a reflective electrode.

The NIR detector may be an NIR organic photodiode that is configured to absorb NIR light of a wavelength spectrum of about 800 nm to about 1500 nm.

The NIR organic photodiode may include an organic light-absorbing layer configured to absorb the NIR light and lower and upper electrodes on opposite surfaces of the organic light-absorbing layer, respectively. The upper electrode may be a transparent electrode having a transmittance equal to or greater than about 80%, and the lower electrode is a reflective electrode.

The NIR light sensor stack may be configured to detect a fingerprint, an iris, or face image.

A display device may include the OLED panel embedded with the NIR light sensor.

According to some example embodiments, an Organic Light Emitting Diode (OLED) panel may include a plurality of OLED pixels, where the plurality of OLED pixels includes a substrate, an OLED stack on the substrate, the OLED stack configured to emit visible light, and an NIR light sensor stack between the substrate and the OLED stack, the NIR light sensor stack including an NIR emitter configured to emit NIR light, and an NIR detector.

The NIR light sensor stack may be between the substrate and the OLED stack

The OLED stack may be between the substrate and the NIR light sensor stack.

At least one element of the NIR emitter and the NIR detector may be in a given OLED pixel of the plurality of OLED pixels.

The OLED panel may further include a driver on the NIR light sensor stack such that the driver is between the substrate and the NIR light sensor stack, the driver configured to input and output electrical signals of each of the NIR light sensor stack and the OLED stack.

A driver configured to input and output an electrical signal from the NIR light sensor stack and a driver configured to input and output an electrical signal from the OLED stack may be on a substantially common plane.

The NIR emitter may be an NIR organic photodiode that is configured to emit NIR light of a wavelength spectrum of about 800 nm to about 1500 nm.

The NIR organic photodiode may include an organic emission layer configured to emit the NIR light and lower and upper electrodes on opposite surfaces of the organic emission layer, respectively, and the upper electrode may be a transparent electrode and the lower electrode is a reflective electrode.

The NIR detector may be an NIR organic photodiode that is configured to absorb NIR light of a wavelength spectrum of about 800 nm to about 1500 nm.

The NIR organic photodiode may include an organic light-absorbing layer configured to absorb the NIR light and lower and upper electrodes on opposite surfaces of the organic light-absorbing layer, respectively. The upper electrode may be a transparent electrode having a transmittance equal to or greater than about 80%, and the lower electrode is a reflective electrode.

According to some example embodiments, an electronic device may include a memory, a processor, and a display device including an Organic Light Emitting Diode (OLED) panel. The OLED panel may include a substrate, an OLED stack on the substrate, the OLED stack configured to emit visible light, and an NIR light sensor stack between the substrate and the OLED stack, the NIR light sensor stack including an NIR emitter configured to emit NIR light and an NIR detector, such that the NIR light sensor includes the NIR emitter and the NIR detector.

The processor may be configured to execute a program of instructions stored in the memory to implement biometric recognition of an individual based on processing electrical signals received from the NIR light sensor to detect a fingerprint, an iris, or face image.

The OLED panel may further include a driver between the substrate and the NIR light sensor stack, the driver configured to input and output electrical signals of each of the NIR light sensor stack and the OLED stack.

A driver configured to input and output an electrical signal from the NIR light sensor stack and a driver configured to input and output an electrical signal from the OLED stack may be on a substantially common plane.

The NIR emitter may be an NIR organic photodiode that is configured to emit NIR light of a wavelength spectrum of about 800 nm to about 1500 nm.

The NIR organic photodiode may include an organic emission layer configured to emit the NIR light and lower and upper electrodes on opposite surfaces of the organic emission layer, respectively, and the upper electrode may be a transparent electrode and the lower electrode is a reflective electrode.

The NIR detector may be an NIR organic photodiode that is configured to absorb NIR light of a wavelength spectrum of about 800 nm to about 1500 nm.

The NIR organic photodiode may include an organic light-absorbing layer configured to absorb the NIR light and lower and upper electrodes on opposite surfaces of the organic light-absorbing layer, respectively, wherein the upper electrode is a transparent electrode having a transmittance equal to or greater than about 80%, and the lower electrode is a reflective electrode.

DETAILED DESCRIPTION

Hereinafter, example embodiments will be described in detail so that a person skilled in the art would understand the same. This disclosure may, however, be embodied in many different forms and is not construed as limited to the example embodiments set forth herein.

Hereinafter, an organic light emitting diode (OLED) panel embedded with a near-infrared organic photosensor according to some example embodiments is described with references to drawings.

FIGS. 1A-1BandFIG. 2show a pixel layout of an OLED panel1000embedded with a near-infrared organic photosensor230according to some example embodiments and a cross-sectional view thereof, respectively.

Referring toFIGS. 1A-1BandFIG. 2, an OLED panel1000embedded with a near-infrared organic photosensor230according to some example embodiments is a stack-type panel including a near infrared (NIR) organic photosensor stack200stacked under an OLED stack300. As shown in at leastFIG. 2, the OLED panel1000may include a substrate110, an OLED stack300on the substrate, and an NIR organic photosensor stack200on the substrate110, where the NIR organic photosensor stack200(“NIR light sensor stack”), as shown inFIG. 2, may be between the substrate110and the OLED stack300.

In the OLED panel1000embedded with a near-infrared organic photosensor230, sub-pixels emitting different lights (R, G, B) having different wavelengths from each other are gathered to provide a unit pixel (Px), and the unit pixel (Px) is repeatedly arranged with a matrix to complete the OLED panel1000.

As described herein, the near-infrared (NIR) organic photosensor230is “embedded” in the OLED panel1000based on being included within the outer volume boundaries defined by the OLED panel1000. Accordingly, the photosensor230may configure the OLED panel1000to implement biometric recognition of a subject without having effect on an aperture ratio of the OLED emitter310. For example, as shown in at leastFIG. 2, the NIR organic photosensor230is located within the outer volume boundaries defined by, at a first side, at least one of OLED stack300and the cover glass450and, at a second side, at least one of driver100and substrate110. Thus, the NIR organic photosensor230may be understood to be, based on being “embedded” in the OLED panel1000, located within an interior of the OLED panel1000as defined by the outer volume boundaries of at least some elements of the OLED panel1000that are configured to enable emission of light from the OLED stack300.

WhileFIGS. 1A-1BandFIG. 2illustrate the NIR photosensing stack200as being distal from front surface1000ain relation to the OLED stack300, it will be understood that, in some example embodiments, the NIR photosensing stack may be proximate to front surface1000ain relation to the OLED stack300, such that the NIR organic photosensor stack200is between the cover glass450and the OLED stack300.

FIGS. 1A-1Bexemplify a plane view (FIG. 1A) and a perspective view (FIG. 1B) in which an NIR organic photosensor230is disposed in each OLED sub-pixel (Sub-Px). The NIR organic photosensor230may include an NIR organic emitter210and an NIR detector220for improving (“configured to improve”) biometric recognition efficiency. As shown in at leastFIG. 1A, at least one element of the NIR organic emitter210and NIR organic detector220may be in a given pixel (Px) of the OLED panel1000.

Accordingly, as shown inFIG. 2that is a cross-sectional view taken along a line II-II′ ofFIG. 1B, a sub-pixel region and an NIR organic photosensor region are overlapped.

As referred to herein, an element that is “on” another element may be “above” or “under” the other element. Conversely, an element that is described as being “above” or “under” another element will be understood to be “on” the other element. Additionally, an element that is “on” another element may be “directly on” (e.g., in contact with) the other element or may be “indirectly on” (e.g. isolated from direct contact with via an interposing element(s) and/or a gap space) the other element.

The OLED stack300is a region of a device that is configured to display an image. Accordingly, the OLED stack300may be configured to emit visible light (e.g., light in a visible wavelength spectrum). The visible wavelength spectrum may include light in a range of about 380 nanometers to about 800 nanometers. When the terms “about” or “substantially” are used in this specification in connection with a numerical value, it is intended that the associated numerical value include a tolerance of ±10% around the stated numerical value. When ranges are specified, the range includes all values therebetween such as increments of 0.1%. The OLED stack300includes an organic light emitting diode (OLED) emitter310including an organic emission layer311, and a first electrode313and a second electrode315formed under and over the organic emission layer311, respectively, such that the first and second electrodes313and315are, respectively, on opposite surfaces of the organic emission layer311. As shown inFIG. 2, the OLED emitter310may be at least partially on each of a lower insulation layer360and an upper insulation layer350of the OLED stack300, and may further be at least partially between the lower insulation layer360and the upper insulation layer350. The organic emission layer311may be formed of (“may at least partially comprise”) various organic materials inherently configured to emit light330of any one color of red R, green G, and blue B colors toward a front surface1000aof the OLED panel1000, that is in an opposite direction of (e.g., away from) the NIR organic photosensor stack200, as shown in at leastFIG. 2. Either one electrode of the first electrode313and the second electrode315is connected (e.g., electrically coupled) with a driving voltage line (Vdd) and an output terminal (Out Put) to be configured to function as an anode, and the other one electrode is connected (e.g., electrically coupled) with a common voltage (Vss) to be configured to function as a cathode. The second electrode315may be formed as (“may at least partially comprise”) a transparent electrode having a thickness of 10 nm or less in order to be configured to display light emitted from the organic emission layer311outside (e.g., towards front surface1000ato an external environment that is external to the OLED panel1000). For example, the second electrode315may be formed of MgAg, Ag, Al, Mo, Ti, TiN, Ni, ITO, IZO, AIZO, AITO, or the like. The first electrode313may be formed of (“may at least partially comprise”) a transparent electrode (e.g., a separate transparent electrode in relation to a transparent electrode of the second electrode315) in order to be configured to enable NIR light to exit from and enter to the NIR organic photosensor stack200(e.g., via surface250a). In some example embodiments, the transparent electrode is formed with (“at least partially comprises”) a transparent material having transmittance of 80% or more. For example, the first electrode313may be formed of (“may at least partially comprise”) ITO, IZO, AIZO, AITO, or the like. The NIR organic photosensor stack200(“NIR light sensor stack”) may include an NIR organic emitter210and an NIR organic detector220. The NIR organic emitter210and the NIR organic detector220may collectively comprise the NIR organic photosensor230(“NIR light sensor”). As shown inFIG. 2, the NIR organic photosensor230may be at least partially on each of a lower insulation layer260and an upper insulation layer250of the NIR organic photosensor stack200, and may further be at least partially between the lower insulation layer260and the upper insulation layer250.

The NIR organic emitter210may be an NIR organic photodiode including an organic emission layer211that is configured to emit light in an NIR wavelength spectrum (e.g., one or more NIR wavelengths in a wavelength spectrum ranging from about 800 nm to about 1500 nm) and a first electrode213and a second electrode215formed under and over the organic emission layer211, respectively (e.g., on opposite surfaces of the organic emission layer211, as shown in at leastFIG. 2). The organic emission layer211may be formed of (“may at least partially comprise”) one material of the following materials represented by Chemical Formula 1 or a mixture thereof, which are appropriate for emitting NIR light of a wavelength region ranging from about 800 nm to about 1500 nm, but the present disclosure is not limited thereto but may include any material appropriate for emitting light in a desired NIR wavelength.

At least one electrode of the first electrode213(“lower electrode”) and the second electrode215(“upper electrode”) is connected (e.g., electrically coupled) with a driving voltage line (Vdd) and an output terminal (Out Put) and is configured to function as an anode, and the other electrode is connected (e.g., electrically coupled) with a common voltage (Vss) and is configured to function as a cathode. The second electrode215may be formed as (“may at least partially comprise”) a transparent electrode in order to be configured to enable NIR light emitted from the NIR organic emitter210to exit the NIR organic photosensor stack200(e.g., the surface250a). For example, the second electrode215may be formed of (“may at least partially comprise) ITO, IZO, ALZO, ALTO, or the like. The first electrode213may be formed as (“may at least partially comprise”) a reflective electrode configured to enable the emitted light to be emitted toward the second electrode215through resonance, and the second electrode215may be a transparent electrode. For example, the second electrode215may be formed of (“may at least partially comprise”) Al, Ag. Mo, AlNd, Mo/Al/Mo, TiN, ITO/Ag/ITO, ITO/Al/ITO, ITO/Mo/ITO, or the like.

The NIR organic detector220may be an NIR organic photodiode including an organic light-absorbing layer221that is configured to absorb light in an NIR wavelength and a first electrode223and a second electrode225formed under and over the organic light-absorbing layer221, respectively (e.g., on opposite surfaces of the organic light-absorbing layer221, as shown in at leastFIG. 2). The organic light-absorbing layer221may be formed of (“may at least partially comprise”) a material appropriate for absorbing (“configured to absorb”) light of a NIR wavelength. In other words, the organic light-absorbing layer221may be formed of (“may at least partially comprise”) an appropriate material for absorbing (“configured to absorb”) light in a wavelength region (“wavelength spectrum”) of about 800 to about 1500 nm. For example, the organic light-absorbing layer221may be formed of (“may at least partially comprise”) one material of the following materials represented by Chemical Formula 2 or a mixture thereof, but the present disclosure is not limited thereto but may include any appropriate material for absorbing light of an NIR wavelength.

The second electrode225of the NIR organic detector220may at least partially comprise a transparent electrode in order to be configured to absorb NIR at most. In some example embodiments, the second electrode225may be formed of (“may at least partially comprise”) a transparent electrode having transmittance of about 80% or greater (e.g., equal to or greater than about 80%). For example, the second electrode225may be formed of (“may at least partially comprise”) ITO, IZO, AITO, carbon nanotube (CNT), graphene, nanosilver (Nano Ag), or the like. The first electrode223may be formed as (“may at least partially comprise”) a reflective electrode so that the incident light is not transmitted and lost. For example, the first electrode223may be formed of (“may at least partially comprise”) Al, Ag, Mo, AlNd, Mo/Al/Mo, TiN, ITO/Ag/ITO, ITO/Al/ITO, ITO/Mo/ITO or the like.

A driver100may be disposed between the substrate110and the NIR organic photosensor stack200so as to be configured to not inhibit light emitting and light-receiving functions of the OLED stack300and the NIR organic photosensor stack200.

The driver100includes various transistor arrays120a,120b, and120cformed on the substrate110that are configured to input and output electrical signals of each of the NIR organic photosensor stack200and the OLED stack300, and an interlayer insulating layer150in which a multi-layered wire layer140is formed.

The OLED transistor array120a, the transistor array120bfor the NIR organic emitter, and the transistor array120cfor the NIR organic detector (each of which may be referred to herein as a separate “driver”) may be formed on the same plane (e.g., a common plane, as shown in at leastFIG. 2). The OLED transistor array120a, the transistor array120bfor the NIR organic emitter, and the transistor array120cfor the NIR organic detector may be formed on a substantially common (“same”) plane (e.g., the same plane within manufacturing tolerances and/or material tolerances). When they are formed on the same or substantially same plane, each process of forming the transistor arrays120a,120b, and120cmay be simultaneously carried out so it is not needed to produce an additional process mask, compared to the case of forming the transistor arrays120a,120b, and120con different planes, so the number of process steps may be reduced, thereby improving efficiency of fabrication of the OLED panel1000. In addition, the thickness of the panel including the OLED panel1000may be formed to be thinner than the case an OLED panel1000that includes transistor arrays120a,120b, and120cin different planes, so it may favorably accomplish a flexible panel.

The substrate110may be formed with (“may include”) various materials such as glass or plastic. In a case of plastic, it may be formed with (“may include”) a transparent and flexible material.

A cover glass450is attached on an upper surface of the OLED stack300by an adhesive (not shown) to be configured to protect the structure below and to form a display surface and a biometric surface.

FIG. 3is a schematic view illustrating an operation of carrying out biometrics recognition, and specifically, fingerprint recognition, using the organic light emitting diode (OLED) panel embedded with a near-infrared organic photosensor according to some example embodiments.

Referring toFIG. 3, in response to a biometric subject, for example, a finger500being placed on (e.g., directly on and/or indirectly on) the cover glass450of the OLED panel1000, a driving signal is applied to the OLED panel1000to turn on (“initialize”) the diode of the NIR organic emitter210. Accordingly, light240of a NIR wavelength in a range (“wavelength spectrum”) from about 800 nanometers to about 1500 nanometers is emitted from the NIR organic emitter210and radiated into a fingerprint501of the finger500. The light240of a NIR wavelength (“NIR light”) is not a visible ray (“visible wavelength spectrum”) and thus may not be caught (“observed”) by human eyes. In response to an object like the finger500being located on the display surface including the cover glass450, the light240of a NIR wavelength (“NIR light”) may be reflected or scattered on the surface of the finger500. The reflected or scattered NIR light245is light-received and detected by the NIR organic detector220. Charges light-received by the NIR organic detector220are read by a transistor array120cfor an NIR organic detector and go through an image processor to be processed by the image processor to obtain a fingerprint image of the finger500, through which a fingerprint recognition may be performed.

AlthoughFIG. 3exemplifies a fingerprint of a finger500as a biometric subject, the OLED panel1000may be applied for (e.g., configured to detect) various biometric subjects including a palm print, an iris, a retina, and a face.

As for an organic light emitting diode (OLED) panel embedded with the NIR organic photosensor illustrated with a reference toFIGS. 1 to 3, when the NIR organic photosensor230including the NIR organic emitter210and the NIR organic detector220is adopted, the NIR organic emitter210may be configured to selectively emit NIR light230alone and thus may not need a separate NIR color filter. In some example embodiments, the NIR organic emitter210emits NIR alone which is not recognized (“detected”) by a user and thus may give less feeling of fatigue to the user. Furthermore, since NIR has a larger wavelength than visible light and thus small scattering refection, it is advantageous to be used to obtain depth information of an image. In some example embodiments, NIR light230may be selectively emitted to enable biometric recognition in order to enable performance of biometric recognition before (“prior to”) display of the OLED stack300. For example, the OLED panel1000may be configured to generate a display, via OLED stack300, in response to performing biometric recognition of a subject (e.g., via biometric recognition performed regarding finger500). Furthermore, the NIR organic emitter210may be used as a separate NIR light source to increase the degree of constitutional freedom. Accordingly, the NIR organic emitter210and NIR organic detector220(e.g., the NIR organic photosensor230) may configure the OLED panel1000to implement biometric recognition of a subject without having effect on an aperture ratio of the OLED emitter310.

FIGS. 4A-4Dshow a pixel array of the OLED panel1000embedded with an NIR organic photosensor230and various layouts of the NIR organic photosensor230.

As shown inFIG. 4A, the NIR organic photosensor230may not be disposed in some sub-pixels (ex., OLED B), or as shown inFIG. 4B, the NIR organic photosensor230may be disposed in only one sub-pixel (ex., OLED R) of a pixel.

In some example embodiments, as shown inFIG. 4C, each of the NIR organic detector220and the NIR organic emitter210are disposed in a given pixel while being separated in adjacent sub-pixels of the given pixel. In some example embodiments, as shown inFIG. 4D, the NIR organic detector220and the NIR organic emitter210may be disposed in a given pixel while skipping every other sub-pixel of the given pixel in the adjacent sub-pixels of the given pixel.

As shown above, the various arrays of the various pixels and the NIR organic photosensor230may be modified according to the recognition area and the image shape of the biometric subject, such that certain configurations of the NIR organic photosensor230may be configured to provide a particular recognition area and/or to detect a particular image shape of a biometric subject.

FIG. 5is a schematic view of another pixel layout of OLED panel in which an NIR organic photosensor is embedded.FIG. 5shows a pentile matrix type of layout in which one pixel (Px) includes an RGBG pattern. It exemplifies that the NIR organic photosensor230is disposed in every sub-pixel (R, G, B, G), but it may be modified to have the various shapes as inFIG. 4.

FIGS. 6A-6Care schematic view of smart phones1100including OLED panels1000embedded with NIR organic photosensors230according to embodiments.

FIG. 6Ashows that the OLED panel1000that is embedded with an NIR organic photosensor (e.g., photosensor230) may recognize a fingerprint501,FIG. 6Bshows the case of recognizing an iris1500, andFIG. 6Cshows the case of recognizing a face2500.

FIGS. 6A-6Cshow a smart phone1100as one example of the display device, but the OLED panel1000that includes an embedded NIR organic photosensor230may be applied to (“included in”) a screen including a TV as well as for a multi-media player, a tablet PC, or the like that are capable of employing the OLED panel1000embedded with an NIR organic photosensor230, in addition to the smart phone1100.

FIG. 7shows that the NIR organic photosensor230is limitedly disposed in a particular (or, alternatively, predetermined) pixel (Px) of a pixel array part of OLED panel2000. The productivity may be enhanced by forming the NIR organic photosensor230only in a particular (or, alternatively, predetermined) desired pixel (Px) according to the recognition range of the biometric subject and by decreasing an amount of an NIR light-emitting (fluorescence or phosphorescence) material or an NIR light-absorbing material. InFIG. 7, Dr1and Dr2denote a row direction and a column direction, respectively, when a plurality of pixels (Px) are arranged in a matrix.

FIG. 8andFIG. 9show a pixel layout of an OLED panel2000embedded with a near-infrared organic photosensor according to some example embodiments and a cross-sectional view thereof, respectively.

As shown inFIGS. 8 and 9, the NIR organic emitter210and the NIR organic detector220may be on a non-light-emitting portion800of the pixel Px, where the non-light-emitting portion800is between at least two proximate sub-pixels of the pixel Px, and NIR light from NIR organic photosensor stack200is emitted and entered through a non-light-emitting portion800of a pixel Px, between at least two proximate sub-pixels2310R,2310G, and2310B at least partially comprising the pixel Px, in an OLED panel2000in which a NIR organic photosensor is embedded according to some example embodiments.

Accordingly, organic light emitting diode2310constituting the sub-pixels2310R,2310G, and2310B may be formed in a structure capable of strong resonance. Specifically, as shown inFIG. 9, the red sub-pixel2310R, the green sub-pixel2310G, and the blue sub-pixel2310B are formed of the organic light emitting diode2310. The organic light emitting diode (OLED)2310includes an organic emission layer311for emitting light of a corresponding wavelength and a first electrode2313and a second electrode315formed on and under the organic mission layer311. Either one of the first electrode313and the second electrode315is connected with a driving voltage line (Vdd) and an output terminal (Out Put) to function as an anode, and the other one is connected with a common voltage (Vss) to function as a cathode. The second electrode315may be formed as a transparent electrode having a thickness of 10 nm or less in order to display light emitted from the organic emission layer311outside. For example, the second electrode315may be formed of MgAg, Ag, Al, Mo, Ti, TiN, Ni, ITO, IZO, AIZO, AITO, or the like. The first electrode2313may be formed as (“may include”) a reflective electrode because the first electrode2313is independent of light exit from and enter to the NIR organic photosensor stack200. By forming the first electrode2313as a reflective electrode, the luminous efficiency of the organic light emitting diode2310can be further improved. For example, the first electrode2313may be made of Al, Ag. Mo, AlNd, Mo/Al/Mo, TiN, ITO/Ag/ITO, ITO/Al/ITO and ITO/Mo/ITO.

The NIR organic emitter210and the NIR organic detector220constituting the NIR organic photosensor stack200may be larger, the same or smaller than the organic light emitting diode2310, respectively. The NIR organic emitter210and the NIR organic detector220may be disposed under the non-light-emitting portion800between the organic light emitting diode2310constituting the sub-pixels2310R,2310G, and2310B to allow NIR light to exit from and enter to the NIR organic photosensor stack200through the non-light-emitting portion800at least partially defined by the lower insulation layer360between the organic light emitting diode2310. Accordingly, the NIR organic emitter210and NIR organic detector220(e.g., the NIR organic photosensor230) may configure the OLED panel1000to implement biometric recognition of a subject without having effect on an aperture ratio of the OLED emitter310. Other remaining components are the same as those of the example embodiments described with reference toFIG. 2, and therefore, description thereof will be omitted.

FIG. 10is a schematic view illustrating an operation of carrying out biometrics recognition, and specifically, fingerprint recognition, using the organic light emitting diode (OLED) panel embedded with a near-infrared organic photosensor according to some example embodiments.

On the cover glass450of the OLED panel1000, when a biometric subject, for example, a finger500is put, a driving signal is applied thereto to turn on the diode of the NIR organic emitter210. Accordingly, light240of a NIR wavelength in a range from about 800 to about 1500 is emitted from the NIR organic emitter210and radiated into a fingerprint of the finger500through the non-light-emitting portion800between the organic light emitting diode2310constituting the sub-pixels2310R,2310G. The light240of a NIR wavelength is not a visible ray and thus may not be caught by human eyes. When an object like the finger500is put on the display surface formed of the cover glass450, the light240of a NIR wavelength may be reflected or scattered on the surface of the finger500. The reflected or scattered NIR light245is received and detected by the NIR organic detector220through the non-light-emitting portion800at least partially defined by the lower insulation layer360between the organic light emitting diode2310constituting the sub-pixels2310R,2310G. Accordingly, the NIR organic emitter210and NIR organic detector220(e.g., the NIR organic photosensor230) may configure the OLED panel1000to implement biometric recognition of a subject without having effect on an aperture ratio of the OLED emitter310.

FIG. 11shows an operation algorithm of the OLED panel1000or2000in which the NIR organic emitter210and the NIR organic detector220are embedded.

First, it is determines whether an R/G/B OLED is turned on (1001). An R/G/B OLED being on means a state of shifting to a display mode after switching a start power on. The NIR organic emitter210and the NIR organic detector220are not operated when an R/G/B OLED is turned off (1002). When an R/G/B OLED is turned on, it is determined whether a locking device turns on (1003). When the locking device is turned off, the NIR organic emitter210and the NIR organic detector220are not operated since it is also one means of locking device (1004). When the locking device turns on, it is determined whether touch sensors turn on (1005). When the touch sensor is turned off, the NIR organic emitter210and the NIR organic detector220do not operate (1006). This is to prevent a power consumption loss of more than that required by blocking touch in a waiting mode. When the touch sensor turns on even in a locking mode, it is determined whether a finger contacts the surface of the panel for a particular (or, alternatively, predetermined) time or longer (e.g., 1 second or longer) (1007), and the NIR organic emitter210and the NIR organic detector220are operated when being contacted for the particular (or, alternatively, predetermined) time or longer (1008). It is determined whether a fingerprint recognition is completed (1009), and when the fingerprint recognition is completed, the NIR organic emitter210and the NIR organic detector220do not operate (1010) and the locking device is turned off (1011). When the fingerprint recognition is not completed, the locking device turns on again (1012), and the procedure goes to step1005again and operates.

FIG. 12is a schematic diagram of an electronic device1200according to some example embodiments.

As shown inFIG. 12, an electronic device1200may include a processor1220, a memory1230, and display device1240that are electrically coupled together via a bus1210. The display device1140may be display device of any of the example embodiments as described herein, and thus may include any of the example embodiments of OLED panels as described herein. The memory1230, which may be a non-transitory computer readable medium, may store a program of instructions. The processor1220may execute the stored program of instructions to perform one or more functions, including implementing the biometric recognition of an individual based on processing electrical signals received from the NIR light sensor as described herein (e.g., to detect a fingerprint, an iris, or face image). The processor1120may be configured to generate an output (e.g., an image to be displayed on the display device, a command to operate a locking device, some combination thereof, or the like) based on implementing the biometric recognition.

100: driver120a: TR array for an OLED120b: TR array for NIR organic emitter120c: TR array for NIR organicdetector200: NIR organic photosensor stack210: NIR organic emitter220: NIR organic detector300: OLED stack310: OLED emitter