Display device and fingerprint detection method

Abstract

The invention relates to a display device and a fingerprint detection method. The display device includes: a display panel including a plurality of display pixels in which light emitting elements are arranged and a plurality of sensor pixels in which light receiving elements are arranged; a memory configured to store compensation coefficients for each of the respective positions of the plurality of sensor pixels; and a sensor controller configured to calculate a plurality of correction data by correcting a plurality of fingerprint data obtained from the plurality of sensor pixels using the compensation coefficients stored for each of the respective positions of the plurality of sensor pixels.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0165825 filed in the Korean Intellectual Property Office on November 24, 2023, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] Embodiments of the present disclosure relate to a display device and a fingerprint detection method. More specifically, aspects of one or more embodiments relate to a structure of a display device and a method of detecting a fingerprint by using the display device. Background Art

[0004] In general, a display device includes a light emitting element such as an organic light emitting diode and a thin film transistor formed on a substrate, and the light emitting element is configured to emit light.

[0005] For example, each pixel of a display device generally includes a light-emitting element (such as an organic light-emitting diode), wherein an intermediate layer including an emission layer is located between a pixel electrode and a counter electrode. The display device generally controls the light emission or non-emission of each pixel or the light emission degree of each pixel by a thin film transistor electrically connected to the pixel electrode. Some layers included in the intermediate layer of such a light-emitting element are provided in common in a plurality of light-emitting elements.

[0006] The above information disclosed in this Background section is only for enhancement of understanding of the background technology, and therefore, the information discussed in this Background section does not necessarily constitute prior art. Summary of the invention

[0007] Aspects of one or more embodiments include a display device having relatively improved detection performance while achieving high-quality images and a fingerprint detection method using the display device. However, aspects of the embodiments according to the present disclosure are not limited thereto, and the above characteristics do not limit the scope of the embodiments according to the present disclosure.

[0008] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the embodiments presented in the disclosure.

[0009] According to one or more embodiments, a display device includes: a display panel including a plurality of display pixels arranged with light emitting elements and a plurality of sensor pixels arranged with light receiving elements; a memory configured to store a compensation coefficient for each of corresponding positions of the plurality of sensor pixels; and a sensor controller configured to correct a plurality of fingerprint data obtained from the plurality of sensor pixels by using the compensation coefficient stored for each of the corresponding positions of the plurality of sensor pixels to calculate a plurality of correction data.

[0010] According to some embodiments, the plurality of fingerprint data may be current values ​​measured by light receiving elements respectively arranged in a plurality of sensor pixels that have detected light reflected by the fingerprint of the user.

[0011] According to some embodiments, for each of the corresponding positions of the plurality of sensor pixels, the plurality of fingerprint data may include high fingerprint data having a maximum value among the plurality of pieces of data of the plurality of sensor pixels and low fingerprint data having a minimum value among the plurality of pieces of data of the plurality of sensor pixels. According to some embodiments, the high fingerprint data and the low fingerprint data may have random values ​​for each of the plurality of sensor pixels.

[0012] According to some embodiments, the high fingerprint data may be data about the valleys of the user's fingerprint, and the low fingerprint data may be data about the ridges of the user's fingerprint.

[0013] According to some embodiments, each of the plurality of correction data may include high correction data obtained by correcting the high fingerprint data and low correction data obtained by correcting the low fingerprint data. According to some embodiments, the high correction data may have a specific non-zero value for all of the plurality of sensor pixels, and the low correction data may have a value of 0 for all of the plurality of sensor pixels.

[0014] According to some embodiments, the sensor controller may include: a data obtainer configured to generate a plurality of fingerprint data by using electrical signals input from corresponding light receiving elements of a plurality of sensor pixels; and a data processor configured to calculate a plurality of correction data by correcting the plurality of fingerprint data using a compensation coefficient.

[0015] According to some embodiments, the sensor controller may further include a fingerprint detector configured to detect a fingerprint of the user based on the plurality of correction data.

[0016] According to some embodiments, the compensation coefficient may be a value calculated using high sensor data measured for each of the plurality of sensor pixels in a bright environment and low sensor data measured for each of the plurality of sensor pixels in a dark environment.

[0017] According to some embodiments, a value obtained by subtracting low sensor data from high sensor data is referred to as variation data, and a compensation coefficient of a specific sensor pixel among a plurality of sensor pixels may be a value obtained by dividing an average value of corresponding variation data of the plurality of sensor pixels by the variation data of the specific sensor pixel.

[0018] According to some embodiments, the data processor may be configured to calculate a plurality of correction data by using a compensation coefficient and a specific function, and the specific function may obtain the plurality of correction data by multiplying a value obtained by subtracting the low sensor data from the plurality of fingerprint data by the compensation coefficient.

[0019] According to one or more embodiments, a fingerprint detection method uses a display device including a plurality of display pixels arranged with light-emitting elements and a plurality of sensor pixels arranged with light-receiving elements, the fingerprint detection method comprising: calculating a compensation coefficient for each of corresponding positions of the plurality of sensor pixels by the display device, and storing the compensation coefficient in a memory by the display device; generating fingerprint data for each of the plurality of sensor pixels by the display device in a use mode; and correcting the fingerprint data by the display device by using the compensation coefficient to calculate correction data for each of the corresponding positions of the plurality of sensor pixels.

[0020] According to some embodiments, calculating the compensation coefficient by the display device and storing the compensation coefficient in the memory may include: obtaining high sensor data for each of the corresponding positions of the plurality of sensor pixels in a first inspection mode; and obtaining low sensor data for each of the corresponding positions of the plurality of sensor pixels in a second inspection mode. In the first inspection mode, the inspection may be performed in a bright environment; and in the second inspection mode, the inspection may be performed in a dark environment.

[0021] According to some embodiments, the high sensor data may be measured with the reflector placed on the display device to be inspected and the green light turned on.

[0022] According to some embodiments, the low sensor data may be measured with a light absorbing plate or a black box placed on the display device to be inspected and external light blocked.

[0023] According to some embodiments, the high sensor data may be the average value of multiple valid data excluding multiple erroneous measurement data outside the allowable range after taking multiple photos of the display device to be inspected in the first inspection mode, and the low sensor data may be the average value of multiple valid data excluding multiple erroneous measurement data outside the allowable range after taking multiple photos of the display device to be inspected in the second inspection mode.

[0024] According to some embodiments, calculating the compensation coefficient by the display device may also include: calculating change data by subtracting low sensor data from high sensor data for each of the corresponding positions of multiple sensor pixels; and calculating the average value of multiple change data of all multiple sensor pixels.

[0025] According to some embodiments, calculating the compensation coefficient by the display device may further include: dividing an average value of the plurality of variation data of all the plurality of sensor pixels by the variation data of each of the plurality of sensor pixels to calculate the compensation coefficient of each of the plurality of sensor pixels.

[0026] According to some embodiments, calculating the correction data may include correcting the fingerprint data by using a compensation coefficient and a specific function, and the specific function may obtain the correction data by multiplying a value obtained by subtracting the low sensor data from the fingerprint data by the compensation coefficient.

[0027] According to some embodiments, the fingerprint data may include high fingerprint data as data about a valley of the user's fingerprint and low fingerprint data as data about a ridge of the user's fingerprint. According to some embodiments, the correction data may include high correction data obtained by correcting the high fingerprint data and low correction data obtained by correcting the low fingerprint data. According to some embodiments, the high fingerprint data and the low fingerprint data may have a random value for each of the corresponding positions of the plurality of sensor pixels, and each of the high correction data and the low correction data may have a constant value in all the plurality of sensor pixels.

[0028] According to some embodiments, the fingerprint detection method may further include: detecting a fingerprint of the user according to the correction data. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other aspects, features and characteristics of the embodiments of the present disclosure will become more apparent from the following description in conjunction with the accompanying drawings, in which:

[0030] Figure 1 is a schematic plan view of a portion of a display device according to some embodiments;

[0031] Figure 2 is a schematic cross-sectional view of a display device according to some embodiments;

[0032] Figure 3 is an equivalent circuit diagram of a pixel circuit electrically connected to a light emitting element of a display device and a sensor circuit electrically connected to a light receiving element of the display device according to some embodiments;

[0033] Figure 4 is a schematic block diagram of an inspection system and a sensor system according to some embodiments;

[0034] Figure 5 is a flow chart of a fingerprint detection method using a display device according to some embodiments;

[0035] Figure 6 is a flow chart of some operations included in a fingerprint detection method using a display device according to some embodiments; and

[0036] Figures 7 to 10 is a diagram illustrating pieces of data in a fingerprint detection method using a display device according to some embodiments. DETAILED DESCRIPTION

[0037] The aspects of some embodiments shown in the accompanying drawings will now be referred to in more detail, wherein the same reference numerals always refer to the same elements. To this end, the present embodiment may have different forms and should not be construed as being limited to the elaboration herein. Therefore, the embodiments are described below only by reference to the accompanying drawings to explain aspects of this specification. As used herein, the term "and / or" includes any combination and all combinations of one or more related listed items. Throughout this disclosure, the expression "at least one of a, b, and c" indicates only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or their variants.

[0038] Since the present disclosure allows various changes and numerous embodiments, specific embodiments will be shown in the drawings and described in more detail in the written description. Hereinafter, the effects and features of the present disclosure and the methods for implementing them will be more fully described with reference to the drawings showing embodiments of the present disclosure. However, the present disclosure can be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein.

[0039] One or more embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Regardless of the figure number, components that are identical or corresponding to each other are given the same reference numerals, and redundant explanations are omitted.

[0040] It will be understood that although the terms "first", "second", etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are only used to distinguish one component from another component.

[0041] As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0042] It will also be understood that the terms “comprises” and / or “comprising” as used herein specify the presence of stated features or components, but do not preclude the presence or addition of one or more other features or components.

[0043] It will be understood that when a layer, region or component is referred to as being “formed on” another layer, region or component, the layer, region or component can be directly or indirectly formed on the other layer, region or component. That is, for example, intervening layers, regions or components may be present.

[0044] For the convenience of explanation, the size of the elements in the drawings may be exaggerated or reduced. For example, because the size and thickness of the components in the drawings are arbitrarily shown for the convenience of explanation, the embodiments are not limited thereto.

[0045] When a certain embodiment can be implemented in different ways, the specific processing order may be different from the described order. For example, two processes described successively may be performed substantially simultaneously, or in the reverse order of the described order.

[0046] It will also be understood that when a layer, region, or component is referred to as being "connected" or "coupled" to another layer, region, or component, the layer, region, or component may be directly connected or coupled to the other layer, region, or component, or there may be intervening layers, regions, or components. For example, when a layer, region, or component is referred to as being "electrically connected" or "electrically coupled" to another layer, region, or component, the layer, region, or component may be directly electrically connected or coupled to the other layer, region, or component, or there may be intervening layers, regions, or components.

[0047] Figure 1 is a schematic plan view of a portion of a display device 1 according to some embodiments.

[0048] refer to Figure 1 , the display device 1 may include a display area DA in which a plurality of display pixels PX are arranged and a peripheral area PA located outside the display area DA (e.g., outside the periphery or footprint of the display area DA). For example, the peripheral area PA may surround the entire display area DA. This may be understood as a substrate included in the display device 1 having the display area DA and the peripheral area PA.

[0049] Each of the multiple display pixels PX of the display device 1 may represent the minimum unit for displaying an image, and the display device 1 may display a desired image by a combination of the multiple display pixels PX. For example, each of the multiple display pixels PX may emit light of a certain color, and the display device 1 may display a desired image by using the light emitted by the multiple display pixels PX. For example, each of the multiple display pixels PX may emit red light, green light, or blue light. Each of the multiple display pixels PX may include a light-emitting element such as an organic light-emitting diode. The display pixel PX may be connected to a pixel circuit including a thin film transistor (TFT) and a storage capacitor.

[0050] The display area DA may include a sensing area in which a plurality of sensor pixels SP are arranged. The sensing area is not an area in which only a plurality of sensor pixels SP are arranged, but may include at least some display pixels PX among a plurality of display pixels PX included in the display area DA. According to some embodiments, a portion of the display area DA may be set as the sensing area. According to some embodiments, the entire display area DA may be set as the sensing area.

[0051] Each of the plurality of sensor pixels SP may include a light receiving element and may detect reflected light obtained by reflecting light emitted from a light source by a user's finger. The display device 1 may detect a user's fingerprint by analyzing the reflected light. The present disclosure will now be described by taking each of the plurality of sensor pixels SP for fingerprint detection as an example. However, according to various embodiments, the plurality of sensor pixels SP may perform various functions such as a touch sensor or a scanner.

[0052] Each of the plurality of sensor pixels SP may overlap at least some or all of the plurality of display pixels PX provided in the sensing region, or may be arranged around the display pixels PX. For example, at least some or all of the plurality of sensor pixels SP may be provided between the display pixels PX.

[0053] The display area DA may include: Figure 1 . For example, the display area DA may have a rectangular shape in which the horizontal length is greater than the vertical length, a rectangular shape in which the horizontal length is less than the vertical length, or a square shape. Optionally, the display area DA may have any of various shapes such as an ellipse or a circle. The horizontal length may be defined in a first direction x, the vertical length may be defined in a second direction y, and the third direction z may be a direction perpendicular to both the first direction x and the second direction y.

[0054] The peripheral area PA may be a non-display area where display pixels PX are not provided and images are not displayed. A driver or the like for providing electrical signals or power to the display pixels PX may be arranged in the peripheral area PA. Pads to which various electronic devices or printed circuit boards (PCBs) may be electrically connected to each other may be located in the peripheral area PA. The pads are arranged so that they are spaced apart from each other in the peripheral area PA and may be electrically connected to the PCB or an integrated circuit device.

[0055] Figure 2 is a schematic cross-sectional view of a display device 1 according to some embodiments.

[0056] refer to Figure 2According to some embodiments, the display device 1 may include a plurality of display pixels, namely, a first display pixel PX1, a second display pixel PX2, and a third display pixel PX3, and a first sensor pixel SP1. The first display pixel PX1 may include a first light emitting element ED1, the second display pixel PX2 may include a second light emitting element ED2, and the third display pixel PX3 may include a third light emitting element ED3. The first sensor pixel SP1 may include a first light receiving element PD1. The first light emitting element ED1, the second light emitting element ED2, and the third light emitting element ED3 may emit different lights. For example, the first light emitting element ED1 may emit green light, the second light emitting element ED2 may emit red light, and the third light emitting element ED3 may emit blue light.

[0057] like Figure 2 As shown in , the display device 1 may have a function of sensing an object in contact with the cover window CW, for example, a fingerprint of a finger F. At least a portion of the reflected light reflected by the fingerprint of the user among the light emitted from at least one of the first light emitting element ED1, the second light emitting element ED2, and the third light emitting element ED3 is re-incident on the first light receiving element PD1, so that the first light receiving element PD1 can detect the reflected light. For example, the green light emitted by the first light emitting element ED1 is reflected by the object in contact with the cover window CW and is re-incident on the first light receiving element PD1, so that the first light receiving element PD1 can detect the re-incident green light.

[0058] Figure 3 is an equivalent circuit diagram of a pixel circuit PC electrically connected to a light emitting element ED of a display device and a sensor circuit PC' electrically connected to a light receiving element PD of the display device according to some embodiments. Figure 3 Various components are shown, but the embodiments according to the present disclosure are not limited thereto, and various embodiments may include additional components or fewer components without departing from the spirit and scope of the embodiments according to the present disclosure.

[0059] refer to Figure 3 , Figure 1 The display pixel PX may include a light emitting element ED and a pixel circuit PC that controls the amount of light emitted by the light emitting element ED, and Figure 1 The sensor pixel SP may include a light receiving element PD and a sensor circuit PC' that controls the amount of light received by the light receiving element PD.

[0060] Each pixel circuit PC can be connected to a scan start line GIL, a scan control line GCL, a first scan write line GWL1, a second scan write line GWL2, an emission line EML, and a data line DL. Each pixel circuit PC can also be connected to a first drive voltage line VDDL to which a first drive voltage is applied, a second drive voltage line VSSL to which a second drive voltage is applied, a first initialization voltage line to which a first initialization voltage Vint1 is applied, and a second initialization voltage line to which a second initialization voltage Vint2 is applied.

[0061] Each sensor circuit PC' can be connected to the first scan write line GWL1, the reset line RSTL and the fingerprint detection line FRL. Each sensor circuit PC' can also be connected to the second driving voltage line VSSL applied with the second driving voltage, the reset voltage line applied with the reset voltage Vrst, and the first initialization voltage line applied with the first initialization voltage Vint1.

[0062] Each pixel circuit PC may include a plurality of transistors and at least one capacitor, and may be connected to the light emitting element ED. The plurality of transistors may include a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a fifth transistor T5, a sixth transistor T6, and a seventh transistor T7. Among the plurality of transistors, the first transistor T1 may be a driving transistor, and the second transistor T2 to the seventh transistor T7 may be transistors used as switching elements, which are turned on or off according to scanning signals applied to the corresponding gate electrodes of the second transistor T2 to the seventh transistor T7.

[0063] The first transistor T1 may include a gate electrode, a first electrode, and a second electrode. The gate electrode of the first transistor T1 may be connected to the first electrode of the third transistor T3 and one electrode of the storage capacitor Cst, the first electrode of the first transistor T1 may be connected to the second electrode of the second transistor T2 and the second electrode of the fifth transistor T5, and the second electrode of the first transistor T1 may be connected to the second electrode of the third transistor T3 and the first electrode of the sixth transistor T6.

[0064] The light emitting element ED emits light according to the driving current. The amount of light emitted by the light emitting element ED may be proportional to the driving current. The light emitting element ED may be an organic light emitting diode including a pixel electrode, a counter electrode, and an organic emission layer between the pixel electrode and the counter electrode.

[0065] Alternatively, the light emitting element ED may be an inorganic light emitting diode including an inorganic emission layer between the pixel electrode and the counter electrode, or may be a quantum dot light emitting diode including a quantum dot emission layer between the pixel electrode and the counter electrode. Alternatively, the light emitting element ED may also be a micro light emitting diode. The pixel electrode of the light emitting element ED may be connected to the second electrode of the sixth transistor T6 and the second electrode of the seventh transistor T7, and the counter electrode of the light emitting element ED may be connected to the second driving voltage line VSSL.

[0066] The second transistor T2 may be turned on by the scan signal of the first scan write line GWL1, thereby connecting the first electrode of the first transistor T1 to the data line DL. The gate electrode of the second transistor T2 may be connected to the first scan write line GWL1, the first electrode of the second transistor T2 may be connected to the data line DL, and the second electrode of the second transistor T2 may be connected to the first electrode of the first transistor T1.

[0067] The third transistor T3 may be turned on by a scan signal of the scan control line GCL, thereby connecting the gate electrode of the first transistor T1 to the second electrode of the first transistor T1. That is, when the third transistor T3 is turned on, the gate electrode and the second electrode of the first transistor T1 are connected to each other, so the first transistor T1 may be driven as a diode. The gate electrode of the third transistor T3 may be connected to the scan control line GCL, the first electrode of the third transistor T3 may be connected to the second electrode of the first transistor T1, and the second electrode of the third transistor T3 may be connected to the gate electrode of the first transistor T1.

[0068] The fourth transistor T4 can be turned on by the scan signal of the scan start line GIL, thereby connecting the gate electrode of the first transistor T1 to the second initialization voltage line. In this case, the gate electrode of the first transistor T1 can be discharged to the second initialization voltage Vint2 of the second initialization voltage line. The gate electrode of the fourth transistor T4 can be connected to the scan control line GCL, the first electrode of the fourth transistor T4 can be connected to the second electrode of the first transistor T1, and the second electrode of the fourth transistor T4 can be connected to the gate electrode of the first transistor T1.

[0069] The fifth transistor T5 can be turned on by the emission signal of the emission line EML, thereby connecting the first electrode of the first transistor T1 to the first driving voltage line VDDL. The gate electrode of the fifth transistor T5 can be connected to the emission line EML, the first electrode of the fifth transistor T5 can be connected to the first driving voltage line VDDL, and the second electrode of the fifth transistor T5 can be connected to the first electrode of the first transistor T1.

[0070] The sixth transistor T6 may be turned on by the emission signal of the emission line EML, thereby connecting the second electrode of the first transistor T1 to the pixel electrode of the light emitting element ED. The gate electrode of the sixth transistor T6 may be connected to the emission line EML, the first electrode of the sixth transistor T6 may be connected to the second electrode of the first transistor T1, and the second electrode of the sixth transistor T6 may be connected to the pixel electrode of the light emitting element ED. When both the fifth transistor T5 and the sixth transistor T6 are turned on, a driving current may be supplied to the light emitting element ED.

[0071] The seventh transistor T7 can be turned on by the scan signal of the second scan write line GWL2, thereby connecting the first initialization voltage line to the pixel electrode of the light emitting element ED. In this case, the pixel electrode of the light emitting element ED can be discharged to the first initialization voltage Vint1. The gate electrode of the seventh transistor T7 can be connected to the second scan write line GWL2, the first electrode of the seventh transistor T7 can be connected to the first initialization voltage line, and the second electrode of the seventh transistor T7 can be connected to the pixel electrode of the light emitting element ED.

[0072] The storage capacitor Cst may be formed between the gate electrode of the first transistor T1 and the first driving voltage line VDDL. One electrode of the storage capacitor Cst may be connected to the gate electrode of the first transistor T1, and the other electrode of the storage capacitor Cst may be connected to the first driving voltage line VDDL. Therefore, the storage capacitor Cst may maintain a potential difference between the gate electrode of the first transistor T1 and the first driving voltage line VDDL.

[0073] Boost capacitor C BOOST The boost capacitor C may be formed between the gate electrode of the second transistor T2 and the gate electrode of the first transistor T1. BOOST One electrode of the capacitor C may be connected to the first scan write line GWL1, the first scan write line GWL1 is connected to the gate electrode of the second transistor T2, and the boost capacitor C BOOST The other electrode of the boost capacitor C may be connected to the gate electrode of the first transistor T1 and one electrode of the storage capacitor Cst. BOOST is a boost capacitor, and when the signal of the first scanning write line GWL1 is a voltage that turns off the second transistor T2, the boost capacitor C BOOST The voltage of the node can be increased, thereby lowering the voltage representing black (black voltage).

[0074] Each sensor circuit PC' may include a plurality of transistors and may be connected to the light receiving element PD. The plurality of transistors may include an eighth transistor T8, a ninth transistor T9, and a tenth transistor T10. Among the plurality of transistors, the eighth transistor T8 may be a driving transistor, and the ninth transistor T9 and the tenth transistor T10 may be transistors as switching elements, which are turned on or off according to reset signals and scan signals applied to corresponding gate electrodes of the ninth transistor T9 and the tenth transistor T10, respectively.

[0075] When a plurality of light emitting elements ED and a plurality of light receiving elements PD are arranged Figure 1 In a display device 1, when the light receiving element PD is driven, the voltage wiring or signal wiring for driving the light emitting element ED can be shared. That is, by minimizing or reducing the voltage wiring or signal wiring for driving the light emitting element ED, the voltage wiring or signal wiring for driving the light emitting element ED can be shared. Figure 1 The additional arrangement of voltage lines or signal lines of the plurality of light receiving elements PD in the display device 1 can ensure Figure 1 The resolution of display device 1 and can be minimized Figure 1 For example, the peripheral area PA is connected to Figure 1 The signal line of the gate electrode of the second transistor T2 of the display pixel PX may be shared with the signal line of the gate electrode of the tenth transistor T10 connected to the optical sensor. That is, the gate electrode of the second transistor T2 and the gate electrode of the tenth transistor T10 may be connected to the first scan write line GWL1. For another example, the second drive voltage line VSSL may be a common voltage line connected to the counter electrode of the light emitting element ED and the counter electrode of the light receiving element PD. For another example, the first initialization voltage line to which the first initialization voltage Vint1 is applied may be a common voltage line connected to the second electrode of the eighth transistor T8 and the second electrode of the seventh transistor T7 of the optical sensor.

[0076] Each of the light receiving elements PD can be a light receiving diode including a sensing electrode, a counter electrode, and a photoelectric conversion layer located between the sensing electrode and the counter electrode. Each of the light receiving elements PD can convert light incident from the outside into an electrical signal. The light receiving element PD can be a light receiving diode formed of a pn-type or pin-type inorganic material, or a phototransistor. Alternatively, the light receiving element PD can be an organic light receiving diode including an electron donor material for generating donor ions and an electron acceptor material for generating acceptor ions.

[0077] When the light receiving element PD is exposed to external light, the light receiving element PD may generate photocharges, and the generated photocharges may be accumulated in the sensing electrode of the light receiving element PD. In this case, the voltage of the node electrically connected to the sensing electrode may increase. When the light receiving element PD and the fingerprint detection line FRL are connected to each other according to the turn-on operation of the eighth transistor T8 and the tenth transistor T10, a current may flow in the fingerprint detection line FRL in proportion to the voltage of the node where the charge is accumulated.

[0078] The eighth transistor T8 can be turned on by a voltage applied to the gate electrode, thereby connecting the first electrode of the tenth transistor T10 to the first initialization voltage line. In this case, the second electrode of the tenth transistor T10 can be discharged to the first initialization voltage Vint1. The gate electrode of the eighth transistor T8 can be connected to a node between the ninth transistor T9 and the light receiving element PD, the first electrode of the eighth transistor T8 can be connected to the first initialization voltage line, and the second electrode of the eighth transistor T8 can be connected to the first electrode of the tenth transistor T10. The eighth transistor T8 can be a source follower amplifier that generates a source-drain current proportional to the amount of charge input to the node of the gate electrode. The first electrode of the eighth transistor T8 can be connected to the first drive voltage line VDDL or the second initialization voltage line.

[0079] The tenth transistor T10 can be turned on by the scan signal of the first scan write line GWL1, thereby connecting the second electrode of the eighth transistor T8 to the fingerprint detection line FRL. The fingerprint detection line FRL can transmit the fingerprint detection signal to the readout circuit. The gate electrode of the tenth transistor T10 can be connected to the first scan write line GWL1, the first electrode of the tenth transistor T10 can be connected to the second electrode of the eighth transistor T8, and the second electrode of the tenth transistor T10 can be connected to the fingerprint detection line FRL.

[0080] The ninth transistor T9 can be turned on by the reset signal of the reset line RSTL, thereby resetting the node connected to the gate electrode of the eighth transistor T8 with the reset voltage Vrst. The gate electrode of the ninth transistor T9 can be connected to the reset line RSTL, the first electrode of the ninth transistor T9 can be connected to the reset voltage line, and the second electrode of the ninth transistor T9 can be connected to the node connecting the light receiving element PD to the eighth transistor T8. When the reset driver that outputs the reset signal of the reset line RSTL is omitted, the ninth transistor T9 can be turned on by the scan signal.

[0081] When the first electrode of each of the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, the eighth transistor T8, the ninth transistor T9 and the tenth transistor T10 is a source electrode, its second electrode may be a drain electrode. Alternatively, when the first electrode of each of the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, the eighth transistor T8, the ninth transistor T9 and the tenth transistor T10 is a drain electrode, its second electrode may be a source electrode.

[0082] The active layer of each of the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, the eighth transistor T8, the ninth transistor T9 and the tenth transistor T10 may be formed of one of polysilicon, amorphous silicon and an oxide semiconductor. For example, the first transistor T1 and the second transistor T2, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7 and the eighth transistor T8, and the tenth transistor T10 may be P-type transistors. In this case, the corresponding active layers of the first transistor T1 and the second transistor T2, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7 and the eighth transistor T8, and the tenth transistor T10 may be formed of polysilicon. Each of the third transistor T3, the fourth transistor T4, and the ninth transistor T9 may be an N-type transistor forming an active layer of an oxide semiconductor.

[0083] However, the embodiments of the present disclosure are not limited thereto, and each of the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, the eighth transistor T8, the ninth transistor T9, and the tenth transistor T10 may be a P-type transistor. For another example, the eighth transistor T8, the ninth transistor T9, and the tenth transistor T10 may be formed as a P-type transistor.

[0084] Figure 4 is a schematic block diagram of an inspection system 200 and a sensor system 300 according to some embodiments.

[0085] refer to Figure 4 According to some embodiments, the fingerprint detection method performed by the display device 1 may include a check system 200 and a sensor system 300. The check system 200 may be built into a Figure 1 The inspection device of the display device 1, and the sensor system 300 can be built in Figure 1 In the display device 1.

[0086] The inspection system 200 and the sensor system 300 can calibrate the data so that Figure 1 The plurality of sensor pixels SP can operate normally. For example, as mentioned above Figure 3 The sensor circuit PC' may include an eighth transistor T8, a ninth transistor T9 and a tenth transistor T10, wherein the eighth transistor T8 may be a driving transistor. The driving transistor may be more affected by process characteristics than the switching transistor, which only functions as a switch and is therefore Figure 1 The dispersion of each sensor pixel SP in may be large. In other words, Figure 1 Display device 1 Figure 1 The plurality of fingerprint data respectively included in the plurality of sensor pixels SP may have random values ​​due to the distribution of the driving transistors and may be biased. In this case, the display device and the fingerprint detection method using the display device according to some embodiments can relatively improve the sensing sensitivity by removing the bias of the plurality of fingerprint data using the inspection system 200 and the sensor system 300.

[0087] The inspection system 200 can inspect the Figure 1 Display device 1 Figure 1 The multiple sensor pixels SP are operating normally and can be checked Figure 1 For example, the inspection system 200 may include a sensor data obtainer 210 , a sensor data processor 220 , and a compensation coefficient calculator 230 .

[0088] The sensor data acquirer 210 can measure Figure 1 The sensor data obtainer 210 may ensure various pieces of raw data in several inspection environments by using the current value of the light receiving element included in each of the plurality of sensor pixels SP.

[0089] The sensor data processor 220 may process the plurality of raw data obtained by the sensor data obtainer 210 to calculate the sensor data. For example, the sensor data processor 220 may play a filtering role of removing a plurality of erroneous data outside the allowable range from the plurality of raw data.

[0090] The compensation coefficient calculator 230 may receive a plurality of processed sensor data and calculate the compensation coefficient for Figure 1 The compensation coefficient for each sensor pixel SP calculated by the compensation coefficient calculator 230 may be stored in the memory 320, which will be described later.

[0091] The sensor system 300 can drive the Figure 1 Display device 1 Figure 1 However, the sensor system 300 may include processing of correction data so that the sensor pixels SP can be driven more accurately. Figure 1 For example, the sensor system 300 may include a sensor controller 310 and a memory 320 , and the sensor controller 310 may include a fingerprint data obtainer 311 , a fingerprint data processor 312 , and a fingerprint detector 313 .

[0092] The fingerprint data acquirer 311 can measure Figure 1 The fingerprint data can be generated by reflecting the light of the user's fingerprint in the plurality of sensor pixels SP of the display device 1. Figure 1 Data obtained by converting light on the light receiving element of each sensor pixel SP into an electrical signal. Figure 1 For each of the plurality of sensor pixels SP, the plurality of fingerprint data may have a random value.

[0093] The memory 320 may store the compensation coefficients calculated by the inspection system 200. However, the memory 320 may store not only Figure 1 The compensation coefficient of each of the plurality of sensor pixels SP can also be stored. Figure 1 Sensor data of each of the plurality of sensor pixels SP.

[0094] The fingerprint data processor 312 may correct the plurality of pieces of fingerprint data obtained by the fingerprint data obtainer 311 to calculate the corrected data. The fingerprint data processor 312 may calculate the corrected data by using both the compensation coefficient and the sensor data stored in the memory 320. Figure 5 and Figure 6 The process of correcting fingerprint data is described in more detail.

[0095] The fingerprint detector 313 can detect the user's fingerprint by using the correction data detected by the fingerprint data processor 312. Since the correction data is a value obtained by correcting the fingerprint data to remove the deviation, the correction data can be judged more accurately than the fingerprint data. Therefore, the display device according to some embodiments and the fingerprint detection method using the display device can relatively improve the sensing sensitivity.

[0096] Figure 5 is a flow chart of a fingerprint detection method using a display device according to some embodiments. Figure 6 is a flow chart of some operations included in a fingerprint detection method using a display device according to some embodiments. Figure 5 and Figure 6 Various operations are shown, but the embodiments according to the present disclosure are not limited thereto, and unless otherwise explicitly explained or implied, there may be additional operations or fewer operations according to various embodiments, or the order of operations may be changed without departing from the spirit and scope of the embodiments according to the present disclosure.

[0097] Figures 7 to 10 is a diagram illustrating pieces of data in a fingerprint detection method using a display device according to some embodiments.

[0098] refer to Figure 5 According to some embodiments, a fingerprint detection method using a display device may include: operation S100, calculating a compensation coefficient for each of corresponding positions of a plurality of sensor pixels in a check mode, and storing the calculated compensation coefficient in a memory; operation S200, generating fingerprint data for each of corresponding positions of a plurality of sensor pixels in a use mode; operation S300, correcting the fingerprint data by using the compensation coefficient and calculating correction data for each of corresponding positions of a plurality of sensor pixels; and operation S400, detecting a user's fingerprint based on the correction data.

[0099] First, in inspection mode, you can Figure 1 The compensation coefficient is calculated for each of the corresponding positions of the plurality of sensor pixels SP and stored in Figure 4 That is, it can be checked by using the inspection device Figure 1 Display device 1 to ensure (or obtain, secure) Figure 1 Sensor data of each of the plurality of sensor pixels SP.

[0100] For example, refer to Figure 6 , operation S100 of calculating compensation coefficients and storing the calculated compensation coefficients in a memory may include: operation S110, measuring high raw data of each of corresponding positions of a plurality of sensor pixels in a first inspection mode and measuring low raw data in a second inspection mode; operation S120, processing the high raw data to obtain high sensor data and processing the low raw data to obtain low sensor data; operation S130, calculating change data for each of corresponding positions of a plurality of sensor pixels by subtracting the low sensor data from the high sensor data; operation S140, calculating an average value of a plurality of change data of all the plurality of sensor pixels; operation S150, calculating corresponding compensation coefficients for the plurality of sensor pixels by dividing the average value of the change data by the change data of each of the plurality of sensor pixels; and operation S160, storing the high sensor data, the low sensor data, and the compensation coefficients in a memory.

[0101] first, Figure 4 The inspection system 200 can be performed by using Figure 4 The sensor data acquirer 210 measures the Figure 1 The raw data of each of the corresponding positions of the plurality of sensor pixels SP is obtained (operation S110). Figure 1 The plurality of sensor pixels SP may include first to n-th sensor pixels (where n is a natural number greater than 0) sequentially arranged from the upper left end to the lower right end in a plan view. Therefore, the inspection device may measure the corresponding plurality of raw data of the first to n-th sensor pixels. That is, the corresponding plurality of raw data may include the first to n-th sensor pixels. Figure 1 The first to nth raw data are divided according to the positions where the plurality of sensor pixels SP are arranged.

[0102] However, the inspection device may not be able to measure multiple pieces of raw data in one environment, but may measure multiple pieces of raw data in multiple environments. According to some embodiments, the inspection device may measure high raw data in a first inspection mode and may measure low raw data in a second inspection mode. In this case, in the first inspection mode, the inspection may be performed in a bright environment, and in the second inspection mode, the inspection may be performed in a dark environment.

[0103] For example, in a first inspection mode, the reflector may be placed on a surface located on the inspection device. Figure 1 The inspection is performed with the display device 1 on and the green light turned on. That is, the first inspection mode can create a bright environment so that data similar to the light reflected by the valleys of the user's fingerprint is generated. To this end, the reflectivity of the reflector can be within the range of ±30% of the amount of light reflected by the valleys of the fingerprint. This is because the sensing sensitivity may be reduced when the reflectivity of the reflector is outside the range of ±30% and is therefore too bright or too dark. For example, the reflector may have a reflectivity similar to the color of the skin. The reflector may have a planar shape or may have a convex shape, such as an integrating sphere shape. However, the reflector may be located at a distance of 1 mm or more to prevent Figure 1 scratches or foreign matter that may appear on the display device 1.

[0104] In the second inspection mode, the light absorbing plate can be placed on the inspection device. Figure 1 The inspection is performed on the display device 1 and the external light is blocked. In this case, it is possible to Figure 1 The inspection is performed with the display device 1 covered by a black box instead of a light absorbing plate. That is, the second inspection mode can create a dark environment so that data similar to light reflected by the ridges of the user's fingerprint is generated. Similar to the reflector, the light absorbing plate can be located at a distance of 1 mm or more to prevent Figure 1scratches or foreign matter that may appear on the display device 1.

[0105] The plurality of pieces of high raw data measured in the first inspection mode and the plurality of pieces of low raw data measured in the second inspection mode may each include Figure 1 For example, the plurality of pieces of high raw data measured in the first inspection mode may include first high raw data measured at the first sensor pixel, second high raw data measured at the second sensor pixel, ..., and nth high raw data measured at the nth sensor pixel. In this case, the first high raw data to the nth high raw data may have values ​​respectively in Figure 1 That is, each of the first high raw data to the nth high raw data is used for Figure 1 The data of one sensor pixel SP may have several values ​​instead of one value.

[0106] Next, Figure 4 The inspection system 200 can be performed by using Figure 4 The sensor data processor 220 processes the plurality of pieces of high raw data and the plurality of pieces of low raw data (operation S120). Figure 4 The sensor data processor 220 may create high sensor data by processing a plurality of pieces of high raw data, and may create low sensor data by processing a plurality of pieces of low raw data.

[0107] The high sensor data is a valid value obtained by filtering several values ​​in a plurality of high raw data, and the low raw data is a valid value obtained by filtering several values ​​in a plurality of low raw data. For example, the high sensor data is an average value of a plurality of valid data excluding a plurality of erroneous measurement data outside the allowable range among a plurality of high raw data obtained by a plurality of shooting operations in the first inspection mode. The low sensor data is an average value of a plurality of valid data excluding a plurality of erroneous measurement data outside the allowable range among a plurality of low raw data obtained by a plurality of shooting operations in the second inspection mode. In other words, the high sensor data can be regarded as a representative sensor current value measured in the first inspection mode, and the low sensor data can be regarded as a representative sensor current value measured in the second inspection mode.

[0108] As described above, generating sensor data by processing raw data is to reduce errors and improve the accuracy of the sensor data because errors may occur due to specific events even during the inspection process.

[0109] In addition, the high sensor data may also have first high sensor data to n-th high sensor data corresponding to the first sensor pixel to the n-th sensor pixel. The low sensor data may also have first low sensor data to n-th low sensor data corresponding to the first sensor pixel to the n-th sensor pixel. For example, in the first sensor pixel, the first high sensor data may be ensured in the first inspection mode, and the first low sensor data may be ensured in the second inspection mode. Similarly, in the n-th sensor pixel, the n-th high sensor data may be ensured in the first inspection mode, and the n-th low sensor data may be ensured in the second inspection mode.

[0110] Now refer to Figure 7 and Figure 8 This is described in more detail. Figure 7 and Figure 8 FIG. 1 is a diagram showing a plurality of pieces of sensor data in a fingerprint detection method using a display device according to some embodiments. First, Figure 7 The horizontal axis of the graph indicates the light intensity in the inspection environment, i.e., reflectivity, and the vertical axis indicates Figure 1 In this case, Figure 7 The figure in shows sensor data in two inspection environments. For example, Figure 7 High sensor data Data1 measured in a bright environment (first inspection mode) and low sensor data Data2 measured in a dark environment (second inspection mode) are shown. In this case, the high sensor data Data1 and the low sensor data Data2 may be data obtained by processing a plurality of raw data as described above.

[0111] Figure 8 The horizontal axis of the graph indicates a number of sensor pixels, and Figure 8 The vertical axis indicates Figure 1 The sensor current value (or simply referred to as "sensor value") of the sensor pixel SP. Figure 8 In , i can be a natural number greater than 0 and less than or equal to n. For example, Figure 8 The high sensor data Data1 and the low sensor data Data2 of each of the first to nth sensor pixels are shown. That is, Figure 4 The inspection system 200 can ensure first high sensor data in a bright environment from the first sensor pixel, and can ensure first low sensor data in a dark environment from the first sensor pixel. Figure 4 The inspection system 200 may ensure the second high sensor data and the second low sensor data from the second sensor pixel, and may ensure the nth high sensor data and the nth low sensor data from the nth sensor pixel.

[0112] like Figure 8 As shown in , the corresponding multiple sensor data of the 1st sensor pixel to the nth sensor pixel may have random values. That is, the first high sensor data to the nth high sensor data may have a deviation for each sensor pixel, and the first low sensor data to the nth low sensor data may also have a deviation for each sensor pixel. As described above, this may be due to Figure 3 This is caused by the distribution of the driving transistors in the sensor circuit PC'.

[0113] Return to reference Figure 6 Next, check the system 200 (see Figure 4 ) of the compensation coefficient calculator 230 (see Figure 4 ) can be obtained by targeting Figure 1 The variation data Δdata is calculated by subtracting the low sensor data from the high sensor data of each of the corresponding positions of the plurality of sensor pixels SP (operation S130). In other words, the compensation coefficient calculator 230 (see Figure 4 ) may calculate first to nth variation data corresponding to the first to nth sensor pixels. For example, in operation S130, the compensation coefficient calculator 230 (see Figure 4 ) can ensure that the first change data is obtained by subtracting the first low sensor data from the first high sensor data associated with the first sensor pixel. Similarly, the compensation coefficient calculator 230 (see Figure 4 ) may ensure that a second variation data is obtained by subtracting the second low sensor data from the second high sensor data associated with the second sensor pixel, and may ensure that an nth variation data is obtained by subtracting the nth low sensor data from the nth high sensor data associated with the nth sensor pixel.

[0114] Figure 8 1 to n th high sensor data and 1 to n th low sensor data of the first sensor pixel to the n th sensor pixel are shown. Figure 8 , check system 200 (see Figure 4 ) of the compensation coefficient calculator 230 (see Figure 4 ) can calculate the variation data Δdata by subtracting each low sensor data Data2 from each high sensor data Data1.

[0115] Next, check system 200 (see Figure 4 ) of the compensation coefficient calculator 230 (see Figure 4 ) can be calculated Figure 1In other words, the compensation coefficient calculator 230 (see Figure 4 ) may calculate an average value Δavg of first to n-th change data respectively corresponding to the first to n-th sensor pixels.

[0116] Now refer to Fig. 9 This is described in more detail. Fig. 9 is a diagram showing sensor data in a fingerprint detection method using a display device according to some embodiments, and is similar to Figure 8 is almost the same, but shows the average value Δavg. Fig. 9 As shown in Figure 4 The compensation coefficient calculator 230 can calculate the compensation coefficient for Figure 1 The corresponding pieces of variation data of the plurality of sensor pixels SP are obtained and then an average value Δavg of the corresponding pieces of variation data is calculated.

[0117] Next, check system 200 (see Figure 4 ) of the compensation coefficient calculator 230 (see Figure 4 ) can be obtained by dividing the average value Δavg of multiple change data by Figure 1 The corresponding multiple pieces of change data Δdata of the multiple sensor pixels SP are used to calculate Figure 1 For example, Figure 4 The compensation coefficient calculator 230 may calculate the first compensation coefficient of the first sensor pixel by dividing the average value Δavg of the variation data by the first variation data. Similarly, Figure 4 The compensation coefficient calculator 230 may calculate a second compensation coefficient for the second sensor pixel by dividing the average value Δavg of the variation data by the second variation data, and may calculate an nth compensation coefficient for the nth sensor pixel by dividing the average value Δavg of the variation data by the nth variation data.

[0118] In other words, each compensation coefficient may be calculated according to Equation 1 below.

[0119] Equation 1

[0120] σn=Δavg / Δn

[0121] Where σn may indicate the nth compensation coefficient of the nth sensor pixel, and Δavg may indicate Figure 1 The average value of the corresponding multiple change data of all sensor pixels SP is Δn, and Δn can indicate the nth change data of the nth sensor pixel. As described above, since the multiple sensor data are for Figure 1Each of the plurality of sensor pixels SP has a random value, so the compensation coefficient calculated by the variation data of the plurality of sensor data is for Figure 1 Each of the plurality of sensor pixels SP may also have a different value.

[0122] Next, the inspection system 200 can Figure 4 The compensation coefficient calculator 230 obtains Figure 1 The corresponding compensation coefficients of the plurality of sensor pixels SP are stored in Figure 4 In addition, the inspection system 200 may also store the Figure 4 The sensor data processor 220 obtains both the high sensor data and the low sensor data and stores them in Figure 4 in the memory 320. Figure 4 The compensation coefficient, high sensor data, and low sensor data stored in the memory 320 may be used for subsequent correction processing of the user's fingerprint data.

[0123] Return to reference Figure 5 , next, Figure 4 The fingerprint data acquirer 311 of the inspection system 200 (see Figure 4 ) can be used in the usage mode for Figure 1 Fingerprint data is generated for each of corresponding positions of the plurality of sensor pixels SP (operation S200). Figure 1 Each of the plurality of sensor pixels SP may generate fingerprint data by detecting light reflected by the fingerprint of the user through a light receiving element.

[0124] Since the fingerprint data is obtained by detecting the fingerprint of the user and converting the detection result into an electric signal, the fingerprint data may include high fingerprint data which is data about the valley of the fingerprint of the user and low fingerprint data which is data about the ridge of the fingerprint of the user. The high fingerprint data is in the range corresponding to Figure 1 The fingerprint data of a sensor pixel SP may have a maximum value among the multiple fingerprint data of the sensor pixel SP, and the low fingerprint data may have a maximum value among the multiple fingerprint data of the sensor pixel SP. Figure 1 may have a minimum value among the multiple pieces of fingerprint data of one sensor pixel SP.

[0125] and Figure 4 Similar to the sensor data obtained by the inspection system 200, for fingerprint data, it can be respectively Figure 1 For example, the first high fingerprint data and the first low fingerprint data can be obtained from the first sensor pixel, the second high fingerprint data and the second low fingerprint data can be obtained from the second sensor pixel, and the nth high fingerprint data and the nth low fingerprint data can be obtained from the nth sensor pixel. As described above, due to Figure 3The distribution of the driving transistors of the sensor circuit PC' is for Figure 1 For each sensor pixel SP, the first to n-th high fingerprint data and the first to n-th low fingerprint data may have a random value.

[0126] Next, the fingerprint data processor 312 of the sensor system 300 may correct the plurality of fingerprint data obtained by the fingerprint data obtainer (or fingerprint data obtaining circuit or fingerprint data obtaining component) 311 to calculate the correction data (operation S300). For example, the fingerprint data processor 312 may generate a compensation characteristic function by using the compensation coefficient calculated by the inspection system 200. The compensation coefficient required for the compensation characteristic function may be extracted from the memory 320.

[0127] The fingerprint data processor 312 may calculate correction data based on a plurality of fingerprint data. The correction data may include first high correction data to n-th high correction data corresponding to the first high fingerprint data to the n-th high fingerprint data, and first low correction data to n-th low correction data corresponding to the first low fingerprint data to the n-th low fingerprint data. For example, the first high correction data may be generated based on the first high fingerprint data, and the first low correction data may be generated based on the first low fingerprint data. The second high correction data may be generated based on the second high fingerprint data, and the second low correction data may be generated based on the second low fingerprint data. The n-th high correction data may be generated based on the n-th high fingerprint data, and the n-th low correction data may be generated based on the n-th low fingerprint data. That is, the first high correction data to the n-th high correction data may correspond to the valley of the user's fingerprint, and the first low correction data to the n-th low correction data may correspond to the ridge of the user's fingerprint.

[0128] In this case, the compensation characteristic function may be the same as shown in Equation 2 below.

[0129] Equation 2

[0130] C(n)=[R(n)-L(n)]×σn

[0131] Wherein C(n) may indicate the correction data of the nth sensor pixel, R(n) may indicate the fingerprint data of the nth sensor pixel, L(n) may indicate the raw sensor data of the nth sensor pixel, and σn may indicate the compensation coefficient of the nth sensor pixel. As described above, because “σn=Δavg / Δn”, that is, “σi=Δavg / [H(n)-L(n)]”, Equation 2 may be expressed as “C(n)=[R(n)-L(n)]×Δavg / [H(n)-L(n)]”, where H(n) may indicate the high sensor data of the nth sensor pixel.

[0132] When the fingerprint data is corrected using a compensation characteristic function such as Equation 2, the correction data may have a specific range of values. For example, when the nth high fingerprint data has the same value as the value of the nth high sensor data, that is, "R(n) = H(n)", the high correction data C(n) of the nth sensor pixel after correction may have a value of Δavg. Alternatively, when the nth low fingerprint data is the same as the nth low sensor data, that is, "R(n) = L(n)", the high correction data C(n) of the nth sensor pixel after correction may have a value of 0. That is, because the high correction data, which is the maximum value among the correction data, has a value of Δavg, and the low correction data, which is the minimum value among the correction data, has a value of 0, the value of the correction data may be between 0 and Δavg.

[0133] Now refer to Fig.10 This is described in more detail. Fig.10 is a diagram illustrating correction data in a fingerprint detection method using a display device according to some embodiments. Fig.10 The horizontal axis of the graph indicates a number of sensor pixels, and Fig.10 The vertical axis indicates Figure 1 For example, Fig.10 The high correction data and the low correction data of each of the first to nth sensor pixels are shown. Fig.10 , it can be seen that all of the first high correction data to the nth high correction data have a value of Δavg, and all of the first low correction data to the nth low correction data have a value of 0.

[0134] That is, although the plurality of pieces of fingerprint data have random values ​​due to the correction as described above, the plurality of pieces of correction data may have values ​​within the range of 0 to Δavg. For example, the first high correction data to the nth high correction data may equally have the value of Δavg, and all of the first low correction data to the nth low correction data may all have a value of 0. That is, because the first high correction data to the nth high correction data corresponding to the valley of the fingerprint have specific values, and the first low correction data to the nth low correction data corresponding to the ridge of the fingerprint have a value of 0, the plurality of correction data may be judged more accurately than the plurality of pieces of fingerprint data having random values.

[0135] Next, the sensor system 300 (see Figure 4 ) of the fingerprint detector 313 (see Figure 4 ) can detect the user's fingerprint based on the calibration data. For example, the fingerprint detector 313 (see Figure 4) can detect valleys of the user's fingerprint based on the first high correction data to the nth high correction data, and can detect ridges of the user's fingerprint based on the first low correction data to the nth low correction data.

[0136] In this case, because both the first high correction data to the nth high correction data and the first low correction data to the nth low correction data have values ​​from which the bias has been removed, the correction data can be more accurate than the fingerprint data when determining the valleys and ridges of the fingerprint. Therefore, according to some embodiments, the display device and the fingerprint detection method using the display device can be performed by using a fingerprint for Figure 1 The fingerprint data is compensated by the correction data of each sensor pixel SP in the image sensor, thereby relatively improving the signal-to-noise ratio (S / N ratio) and the sensing sensitivity.

[0137] As described above, the display device and the fingerprint detection method using the display device according to some embodiments can relatively improve the S / N ratio and the sensing sensitivity as well as the display quality. These effects are only examples, and the scope of the present disclosure is not limited thereto.

[0138] Any suitable hardware, firmware (e.g., application specific integrated circuit), software, or a combination of software, firmware, and hardware may be utilized to implement the electronic or electrical device and / or any other related device or component according to the embodiments of the present invention described herein. For example, the various components of these devices may be formed on an integrated circuit (IC) chip or on a separate IC chip. In addition, the various components of these devices may be implemented on a flexible printed circuit film, a tape carrier package (TCP), a printed circuit board (PCB), or formed on a substrate. In addition, the various components of these devices may be processes or threads that execute computer program instructions on one or more processors running in one or more computing devices and interact with other system components for performing the various functions described herein. The computer program instructions are stored in a memory, and the memory may be implemented in a computing device using a standard memory device (such as, for example, a random access memory (RAM)). The computer program instructions may also be stored in other non-temporary computer-readable media (such as, for example, a compact disc read-only memory (CD-ROM) or a flash drive, etc.). In addition, those skilled in the art will recognize that, without departing from the spirit and scope of the embodiments of the present invention, the functions of various computing devices may be combined or integrated into a single computing device, or the functions of a particular computing device may be distributed across one or more other computing devices.

[0139] It should be understood that the embodiments described herein should be considered in a descriptive sense only and not for the purpose of limitation. The description of features or aspects within each embodiment should generally be considered to be applicable to other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the accompanying drawings, it will be understood by those of ordinary skill in the art that various changes in form and details may be made without departing from the spirit and scope defined by the appended claims and their equivalents.

Claims

1. A display device, wherein: The display device comprises: A display panel including a plurality of display pixels arranged with light emitting elements and a plurality of sensor pixels arranged with light receiving elements; a memory configured to store a compensation coefficient for each of the corresponding positions of the plurality of sensor pixels; and A sensor controller is configured to correct a plurality of fingerprint data obtained from the plurality of sensor pixels by using the compensation coefficient stored for each of the corresponding positions of the plurality of sensor pixels to calculate a plurality of correction data.

2. The display device according to claim 1, wherein: The plurality of fingerprint data are current values ​​measured by the light receiving elements respectively arranged in the plurality of sensor pixels that have detected light reflected by the fingerprint of the user.

3. The display device according to claim 2, wherein: For each of the corresponding positions of the plurality of sensor pixels, the plurality of fingerprint data comprises: high fingerprint data having a maximum value among the plurality of pieces of data of the plurality of sensor pixels; and low fingerprint data having a minimum value among the plurality of pieces of data of the plurality of sensor pixels, and The high fingerprint data and the low fingerprint data have random values ​​for each of the plurality of sensor pixels.

4. The display device according to claim 1, wherein: The sensor controller comprises: a data obtainer configured to generate the plurality of fingerprint data by using electrical signals input from the corresponding light receiving elements of the plurality of sensor pixels; A data processor configured to calculate the plurality of corrected data by correcting the plurality of fingerprint data using the compensation coefficients; and The fingerprint detector is configured to detect a fingerprint of a user based on the plurality of correction data.

5. The display device according to claim 4, wherein: The compensation coefficient is a value calculated using high sensor data measured for each of the plurality of sensor pixels in a bright environment and low sensor data measured for each of the plurality of sensor pixels in a dark environment, and The data processor is configured to calculate the plurality of correction data by using the compensation coefficient and a specific function, and The specific function obtains the plurality of correction data by multiplying a value obtained by subtracting the low sensor data from the plurality of fingerprint data by the compensation coefficient.

6. A fingerprint detection method, wherein: The fingerprint detection method uses a display device including a plurality of display pixels arranged with light emitting elements and a plurality of sensor pixels arranged with light receiving elements, and the fingerprint detection method includes: calculating, by the display device, a compensation coefficient for each of the corresponding positions of the plurality of sensor pixels; storing the compensation coefficient in a memory via the display device; generating, by the display device in a use mode, fingerprint data for each of the plurality of sensor pixels; and The fingerprint data is corrected by the display device using the compensation coefficient to calculate correction data for each of the corresponding positions of the plurality of sensor pixels.

7. The fingerprint detection method according to claim 6, wherein: Calculating the compensation coefficients by the display device and storing the compensation coefficients in the memory includes: obtaining high sensor data for each of the corresponding positions of the plurality of sensor pixels in a first inspection mode; and obtaining low sensor data for each of the corresponding positions of the plurality of sensor pixels in a second inspection mode, and In the first inspection mode, inspection is performed in a bright environment; and in the second inspection mode, inspection is performed in a dark environment.

8. The fingerprint detection method according to claim 7, wherein: Calculating the compensation coefficient by the display device further includes: calculating, for each of the corresponding positions of the plurality of sensor pixels, variation data by subtracting the low sensor data from the high sensor data; Calculating an average value of the plurality of pieces of variation data of all the plurality of sensor pixels; and The average value of the plurality of pieces of variation data of all the plurality of sensor pixels is divided by the variation data of each of the plurality of sensor pixels to calculate the compensation coefficient of each of the plurality of sensor pixels.

9. The fingerprint detection method according to claim 7, wherein: Calculating the correction data includes: correcting the fingerprint data by using the compensation coefficient and a specific function, and The specific function obtains the correction data by multiplying a value obtained by subtracting the low sensor data from the fingerprint data by the compensation coefficient.

10. The fingerprint detection method according to claim 6, wherein: The fingerprint detection method further includes: detecting a user's fingerprint according to the correction data.

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