Display device

Abstract

A display device according to an embodiment of the present application can include a display panel, an input sensor, and a control portion. The display panel can include a light blocking layer defining an opening portion. The input sensor can include a first sensing element, a second sensing element, and a third sensing element. The control portion can calculate a first distance between the first sensing element and the second sensing element overlapping the opening portion when the display panel is in a first state, calculate a second distance between the first sensing element and the third sensing element overlapping the opening portion when the display panel is in a second state different from the first state, and correct an image obtained by the input sensor based on the first distance and the second distance.

Description

TECHNICAL FIELD

[0001] The present application relates to a display device with improved fingerprint recognition performance. BACKGROUND

[0002] Display devices provide various functions capable of communicating with users organically by displaying images to provide information to users or sensing inputs of users, etc. Recent display devices include a function for sensing a fingerprint of a user. As a fingerprint recognition method, there are a capacitive method of sensing a change in capacitance formed between electrodes, an optical method of sensing incident light using a light sensor, an ultrasonic method of sensing vibration using a piezoelectric body, etc. In recent display devices, an input sensor for fingerprint recognition can be disposed on the back of a display panel. SUMMARY

[0003] An object of the present application is to provide a display device with improved fingerprint recognition performance.

[0004] According to an embodiment of the present application, a display device can include a display panel, an input sensor, and a control portion. The display panel can be defined with a folding area and a non-folding area, and can include a base layer, a circuit layer disposed above the base layer, a display element layer disposed above the circuit layer, and a light shielding layer disposed below the display element layer and defined with an opening portion. The input sensor can be disposed below the display panel and overlap the non-folding area, and can include a first sensing element, a second sensing element, and a third sensing element. The control portion can calculate a first distance between the first sensing element and the second sensing element overlapping the opening portion when the display panel is in a first state, calculate a second distance between the first sensing element and the third sensing element overlapping the opening portion when the display panel is in a second state different from the first state, and correct an image obtained by the input sensor based on the first distance and the second distance.

[0005] The first sensing element can be disposed adjacent to an edge of the input sensor.

[0006] The first state can be a state in which the display panel is unfolded, the second state can be a state in which the display panel is folded, and the image can be an image obtained by the input sensor in the second state.

[0007] A plurality of holes can be further defined in the light shielding layer, and the plurality of holes and the opening portion can have the same shape as each other.

[0008] A plurality of holes can be further defined in the light shielding layer, and the opening portion can have a shape different from a shape of each of the plurality of holes.

[0009] The first sensing element, the second sensing element, and the third sensing element can be spaced apart in a first direction.

[0010] The control section can divide the image into a plurality of sub-images based on a difference between the first distance and the second distance, and rotate each of the plurality of sub-images, and provide a fingerprint image by combining the rotated plurality of sub-images.

[0011] The control section can store the difference between the first distance and the second distance, and divide the image into a plurality of sub-images using the difference when the display panel is in the second state.

[0012] The light-blocking layer can overlap the input sensor.

[0013] The control section can obtain fingerprint information by dividing the image into a plurality of sub-images using a cutting line calculated based on a difference between the first distance and the second distance when the display panel is in the second state.

[0014] A display device according to an embodiment of the present disclosure can include a display panel, an input sensor, and a control section. The display panel can define a folding area and a non-folding area, and include a base layer, a circuit layer disposed above the base layer, a display element layer disposed above the circuit layer, and a light-blocking layer disposed below the display element layer and defining an opening portion. The input sensor can be disposed below the non-folding area of the display panel, and include a plurality of sensing elements. The control section can obtain fingerprint information by dividing a first image obtained by the input sensor into a plurality of first sub-images using a first cutting line when the display panel is in an unfolded state, and obtain fingerprint information by dividing a second image obtained by the input sensor into a plurality of second sub-images using a second cutting line different from the first cutting line when the display panel is in a folded state.

[0015] The plurality of sensing elements can include a first sensing element disposed adjacent to an edge of the input sensor, a second sensing element overlapping the opening portion when the display panel is in the unfolded state, and a third sensing element overlapping the opening portion when the display panel is in the folded state.

[0016] The first sensing element, the second sensing element, and the third sensing element can be spaced apart in a first direction.

[0017] The control section can calculate a first distance between the first sensing element and the second sensing element and a second distance between the first sensing element and the third sensing element.

[0018] The second cutting line can be moved from the first cutting line by a difference between the first distance and the second distance.

[0019] The control section can store the difference, and determine the second cutting line using the difference when the display panel is in the folded state, and divide the second image based on the second cutting line.

[0020] The control section can rotate each of the plurality of second sub-images, and provide a fingerprint image by combining the rotated plurality of second sub-images.

[0021] A plurality of holes can be further defined in the light-blocking layer, and the plurality of holes and the opening portion can have the same shape as each other.

[0022] A plurality of holes can be further defined in the light-blocking layer, and the opening portion can have a shape different from a shape of each of the plurality of holes.

[0023] The light-blocking layer can overlap the input sensor.

[0024] (EFFECT OF INVENTION)

[0025] According to the present application, a display device can include an input sensor having a plurality of sensing elements and a control section. A distance calculation section of the control section can calculate a first distance between a first sensing element and a second sensing element when the display device is in an unfolded state, and calculate a second distance between the first sensing element and a third sensing element when the display device is in a folded state. An image division section of the control section can correct an image obtained by the second input sensor based on the first distance and the second distance. The control section can obtain fingerprint information by correcting the image obtained in the state in which the display device is folded. Accordingly, a display device having improved fingerprint recognition performance can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1a and Figure 1b is a perspective view of a display device according to an embodiment of the present application.

[0027] Figure 2 is a cross-sectional view of a display device according to an embodiment of the present application.

[0028] Figure 3a is a plan view showing a portion of a light-blocking layer according to an embodiment of the present application.

[0029] Figure 3b is a plan view showing a part of a light-blocking layer according to an embodiment of the present application.

[0030] Figure 4 is a cross-sectional view of a display device according to an embodiment of the present application.

[0031] Figure 5 is a plan view showing a second input sensor and a control section according to an embodiment of the present application.

[0032] Figure 6a is a plan view showing a second input sensor and a first image according to an embodiment of the present application.

[0033] Figures 6b to 6e is a flowchart showing a process of obtaining fingerprint information using a first image according to an embodiment of the present application.

[0034] Figure 7 is a cross-sectional view of a display device according to an embodiment of the present application.

[0035] Figure 8 is a plan view showing a second input sensor and a second image according to an embodiment of the present application.

[0036] Figure 9 is a cross-sectional view of a display device according to an embodiment of the present application.

[0037] (Explanation of Reference Numerals)

[0038] 1000: display device 100: display panel

[0039] 200: first input sensor 300: second input sensor

[0040] PD1: first sensing element PD2: second sensing element

[0041] PD3: third sensing element 600: control section

[0042] 110: light-blocking layer DETAILED DESCRIPTION

[0043] In this specification, when referring to a certain constituent element (or region, layer, part, etc.) "on" another constituent element, "connected to" or "coupled to" another constituent element, it means that certain constituent element can be directly provided / connected / coupled on another constituent element, or a third constituent element can be provided between them.

[0044] The same reference numerals denote the same constituent elements. In addition, in the drawings, the thickness, proportions, and dimensions of the constituent elements are exaggerated for effective explanation of the technical content.

[0045] "and / or" includes all combinations that can be defined by the relevant composition.

[0046] The terms "first," "second," etc., can be used to describe multiple constituent elements, but the constituent elements described above are not limited by these terms. These terms are used only to distinguish one constituent element from another. For example, without departing from the scope of the invention, a first constituent element may be named a second constituent element, and similarly, a second constituent element may be named a first constituent element. Singular expressions include plural expressions unless explicitly stated otherwise in the context.

[0047] In addition, terms such as "below," "lower side," "above," and "upper side" are used to describe the relationships between the components shown in the accompanying drawings. These terms are relative concepts and are explained based on the directions indicated in the accompanying drawings.

[0048] Unless otherwise defined, all terms used in this specification (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Furthermore, terms such as those defined in commonly used dictionaries shall be interpreted as having the same meaning in the context of the relevant art, and may be explicitly defined herein as long as they are not interpreted as having an ideal or overly formal meaning.

[0049] Terms such as “including” or “having” should be understood as specifying the presence of features, numbers, steps, actions, constituent elements, components, or combinations thereof as described in the specification, and do not preclude the existence or additional possibilities of one or more other features, numbers, steps, actions, constituent elements, components, or combinations thereof.

[0050] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0051] Figure 1a This is a perspective view of a display device according to an embodiment of the present invention. Figure 1b This is a perspective view of a display device according to an embodiment of the present invention. Figure 1a This shows the unfolded state of the display device 1000. Figure 1b This shows the folded state of the display device 1000.

[0052] Reference Figure 1a as well as Figure 1b The display device 1000 can be a device activated by an electrical signal. For example, the display device 1000 can be a mobile phone, tablet computer, car navigation system, game console, or wearable device, but is not limited to these. Figure 1a The display device 1000 is illustrated as a mobile phone.

[0053] The display device 1000 can display an image through an active area 1000A. The active area 1000A can include a plane defined by a first direction DR1 and a second direction DR2 in a state in which the display device 1000 is unfolded. A thickness direction of the display device 1000 can be parallel to a third direction DR3 intersecting the first direction DR1 and the second direction DR2. Accordingly, a front surface (or a top surface) and a back surface (or a bottom surface) of components constituting the display device 1000 can be defined with reference to the third direction DR3.

[0054] The active area 1000A can include a first area 1000A1, a second area 1000A2, and a third area 1000A3. The second area 1000A2 can be bent with reference to a folding axis FX extending in the second direction DR2. Accordingly, the first area 1000A1 and the third area 1000A3 can be referred to as non-bent areas, and the second area 1000A2 can be referred to as a bent area.

[0055] A sensing area 1000DA can be provided in the active area 1000A. The display device 1000 can sense a user's fingerprint provided in the sensing area 1000DA. Although the sensing area 1000DA is shown to correspond to a portion of the active area 1000A in Figure 1a , the sensing area 1000DA is not limited to correspond to a portion of the active area 1000A, but can also correspond to the entire active area 1000A.

[0056] If the display device 1000 is folded, the first area 1000A1 and the third area 1000A3 can face each other. Accordingly, the active area 1000A can not be exposed to the outside in a completely folded state, which can be referred to as in-folding. However, this is exemplary, and the operation of the display device 1000 is not limited thereto.

[0057] For example, in an embodiment of the present disclosure, if the display device 1000 is folded, the first area 1000A1 and the third area 1000A3 can oppose each other. Accordingly, the active area 1000A can be exposed to the outside in a folded state, which can be referred to as out-folding.

[0058] The display device 1000 can perform only one of in-folding or out-folding. Alternatively, the display device 1000 can perform all of in-folding and out-folding. At this time, the same area of the display device 1000, for example, the second area 1000A2 can be in-folded and out-folded. Alternatively, a portion of the display device 1000 can be in-folded, and another portion can be out-folded.

[0059] Although the display device 1000 is shown to be folded in Figure 1a andFigure 1b One folding area and two non-folding areas are shown as examples, but the number of folding areas and non-folding areas according to an embodiment of the disclosure is not limited thereto. For example, the display device 1000 can include a plurality of non-folding areas greater than two and a plurality of folding areas disposed between the non-folding areas adjacent to each other.

[0060] The peripheral area 1000NA can surround the active area 1000A. However, it is not limited thereto, and the shape of the active area 1000A and the shape of the peripheral area 1000NA can be designed relatively. The peripheral area 1000NA can be an area in which an image is not displayed.

[0061] Although the folding axis FX is shown as extending in a direction in which the short axis of the display device 1000 is aligned with the first direction DR1 in Figure 1a In addition, although the folding axis FX is shown as extending in a direction in which the short axis of the display device 1000 is aligned with the first direction DR1 in Figure 1b In addition, although the folding axis FX is shown as extending in a direction in which the short axis of the display device 1000 is aligned with the first direction DR1 in

[0062] Figure 2 is a cross-sectional view of a display device according to an embodiment of the disclosure.

[0063] Referring to Figure 2 , the display device 1000 can include a display panel 100, a first input sensor 200, a second input sensor 300, a cover layer CVL, and a window 400.

[0064] The display panel 100 can be a configuration that substantially generates an image. A display area and a non-display area can be defined in the display panel 100. It can be that the display area of the display panel 100 corresponds to the active area 1000A (see Figure 1a ) of the display device 1000, and the non-display area of the display panel 100 corresponds to the peripheral area 1000NA (see Figure 1a ) of the display device 1000.

[0065] A folding area and a non-folding area can be defined in the display panel 100. The folding area can correspond to the second area 1000A2 of the display device 1000, and the non-folding area can correspond to the first area 1000A1 and the third area 1000A3.

[0066] The display panel 100 can be in a first state in Figure 2 The first state can refer to a state in which the display panel 100 is unfolded.

[0067] The display panel 100 can include a base layer 100-1, a light blocking layer 110, a circuit layer 100-2, a display element layer 100-3, and an encapsulation layer 100-4.

[0068] The base layer 100-1 can be a laminated structure including a silicon substrate, a plastic substrate, a glass substrate, an insulating film, or a plurality of insulating layers.

[0069] The light blocking layer 110 can be disposed on the base layer 100-1. However, this is exemplary, and the position of the light blocking layer 110 can be variously changed if the light blocking layer 110 according to an embodiment of the present application is disposed between the display element layer 100-3 and the second input sensor 300. For example, the light blocking layer 110 can be directly formed under the base layer 100-1. However, it is not limited thereto. The light blocking layer 110 can also be attached to the under surface of the base layer 100-1 through an adhesive layer. The light blocking layer 110 can overlap the second input sensor 300.

[0070] The circuit layer 100-2 can be disposed on the base layer 100-1. The circuit layer 100-2 can include a plurality of insulating layers, a plurality of conductive layers, and a semiconductor layer. The plurality of conductive layers of the circuit layer 100-2 can constitute a signal wiring or a control circuit of a pixel.

[0071] The display element layer 100-3 can be disposed on the circuit layer 100-2. The display element layer 100-3 can be a light emitting type display layer, and is not particularly limited. For example, the display element layer 100-3 can be an organic light emitting display layer, a quantum dot display layer, a nano LED display layer, or a micro LED display layer. The organic light emitting display layer can include an organic light emitting substance. The quantum dot display layer can include quantum dots, quantum rods, or the like. The nano LED display layer and the micro LED display layer can include a small LED element of several hundred micrometers or less.

[0072] The display element layer 100-3 can provide first light LT1 in a direction toward the first input sensor 200. The first light LT1 provided from the display element layer 100-3 can pass through the first input sensor 200 and the window 400 and be output to the outside.

[0073] The encapsulation layer 100-4 can be disposed on the display element layer 100-3 to cover the display element layer 100-3. The encapsulation layer 100-4 can include a first inorganic layer, an organic layer, and a second inorganic layer sequentially stacked in a third direction DR3. However, this is exemplary, and the encapsulation layer 100-4 according to an embodiment of the present application is not limited thereto. For example, the encapsulation layer 100-4 according to an embodiment of the present application can further include a plurality of inorganic layers and a plurality of organic layers. However, this is exemplary, and the encapsulation layer 100-4 according to an embodiment of the present application can also be constituted by a single layer.

[0074] The first inorganic layer can prevent external moisture or oxygen from permeating to the display element layer 100-3. For example, the first inorganic layer can include a silicon nitride, a silicon oxide, or a compound in combination thereof.

[0075] The organic layer can be disposed on the first inorganic layer to provide a flat surface. A bend formed on the first inorganic layer or a particle present on the first inorganic layer, etc. can be covered by the organic layer. For example, the organic layer can include an acrylic organic layer, but is not limited thereto.

[0076] The second inorganic layer can be disposed on the organic layer to cover the organic layer. The second inorganic layer can encapsulate moisture or the like released from the organic layer to prevent inflow to the outside. The second inorganic layer can include a silicon nitride, a silicon oxide, or a compound in combination thereof.

[0077] The first input sensor 200 can be disposed on the display panel 100. The first input sensor 200 can sense an external input applied from the outside. The external input can be a user's input. The user's input can include various forms of external input of a part of the user's body, light, heat, a pen, or pressure, etc.

[0078] The first input sensor 200 can be formed on the display panel 100 through a continuous process. Alternatively, the first input sensor 200 can be combined with the display panel 100 by an adhesive member. For example, the adhesive member can be a transparent adhesive member such as a pressure sensitive adhesive film (PSA), an optically clear adhesive film (OCA), or an optically clear resin (OCR).

[0079] The first input sensor 200 can include a base insulating layer 200-1, a first conductive layer 200-2, a sensing insulating layer 200-3, a second conductive layer 200-4, and a cover insulating layer 200-5.

[0080] The base insulating layer 200-1 can be an inorganic layer including any one of a silicon nitride, a silicon oxynitride, and a silicon oxide. Alternatively, the base insulating layer 200-1 can also be an organic layer including an epoxy resin, an acrylic resin, or an imide resin. The base insulating layer 200-1 can have a single layer structure, or a stacked structure stacked in a third direction DR3.

[0081] The base insulating layer 200-1 can be formed directly on the display panel 100. Alternatively, the base insulating layer 200-1 can be a constituent of the display panel 100. Alternatively, the base insulating layer 200-1 can be formed on a separate base layer, and the base layer and the display panel 100 can be coupled to each other by an adhesive member.

[0082] The first conductive layer 200-2 can be disposed on the base insulating layer 200-1. The sensing insulating layer 200-3 can be disposed on the first conductive layer 200-2. The second conductive layer 200-4 can be disposed on the sensing insulating layer 200-3. The cover insulating layer 200-5 can be disposed on the second conductive layer 200-4.

[0083] Each of the first conductive layer 200-2 and the second conductive layer 200-4 can have a single layer structure or a multi-layer structure stacked in the third direction DR. The conductive layer of the single layer structure can include a metal layer or a transparent conductive layer. The metal layer can include molybdenum, silver, titanium, copper, aluminum, or an alloy thereof. The transparent conductive layer can include a transparent conductive oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium zinc tin oxide (IZTO), or the like. In addition, the transparent conductive layer can include a conductive polymer such as PEDOT, a metal nanowire, graphene, or the like.

[0084] The conductive layer of the multi-layer structure can include a metal layer. The metal layer can have, for example, a three-layer structure of titanium / aluminum / titanium. The conductive layer of the multi-layer structure can include at least one metal layer and at least one transparent conductive layer.

[0085] Each of the first conductive layer 200-2 and the second conductive layer 200-4 can include at least a portion of the first sensing electrode and the second sensing electrode. The first input sensor 200 can obtain information for an external input through a change in mutual capacitance between the first sensing electrode and the second sensing electrode.

[0086] At least any one of the sensing insulating layer 200-3 and the cover insulating layer 200-5 can include an inorganic film. The inorganic film can include at least one of aluminum oxide, titanium oxide, silicon oxide, silicon oxynitride, zirconium oxide, and hafnium oxide.

[0087] At least one of the sensing insulating layer 200-3 and the cover insulating layer 200-5 can include an organic film. The organic film can include at least one of an acrylic resin, a methacrylic resin, a polyisoprene, an ethylene-based resin, an epoxy-based resin, a urethane-based resin, a cellulose-based resin, a siloxane-based resin, a polyimide-based resin, a polyamide-based resin, and a perylene-based resin.

[0088] The second input sensor 300 can be disposed under the display panel 100. The second input sensor 300 can sense biometric authentication information of a user applied from the outside. For example, the biometric authentication information can be a fingerprint. The second input sensor 300 can sense a surface of a touch object. The surface can include surface uniformity or a surface curvature shape. For example, the surface can include fingerprint information of a user. The second input sensor 300 can be referred to as a fingerprint sensing panel, a fingerprint sensing element, a fingerprint sensing module, a fingerprint sensing layer, or an input sensor.

[0089] A sensing area 300-A can be defined in the second input sensor 300. The sensing area 300-A can overlap the sensing area 1000DA of the display device 1000. The second input sensor 300 can be disposed with a plurality of sensing elements, e.g., a plurality of photodiodes, for sensing a fingerprint.

[0090] The second input sensor 300 can include a base layer 300-1 and a biometric information sensing layer 300-2.

[0091] The base layer 300-1 can include a synthetic resin layer. The synthetic resin layer can include a thermosetting resin. In particular, the synthetic resin layer can be a polyimide-based resin layer, and a material thereof is not particularly limited. For example, the base layer 300-1 can include two layers of polyimide-based resin layers and a barrier layer disposed between the polyimide-based resin layers. The barrier layer can include amorphous silicon and silicon oxide.

[0092] The biometric information sensing layer 300-2 can be disposed on the base layer 300-1. The biometric information sensing layer 300-2 can include a sensing circuit and an insulating layer. The sensing circuit can include at least one transistor and at least one photodiode. However, this is exemplary, and the second input sensor 300 according to an embodiment of the present application can include an image sensor. For example, the second input sensor 300 can be a CMOS image sensor or a CCD image sensor.

[0093] The second input sensor 300 can be disposed under the display panel 100. The second input sensor 300 can be attached to the display panel 100 or can not be attached to the display panel 100. Although the second input sensor 300 is disposed under the display panel 100 in the display device 1000 of FIG. 1, the second input sensor 300 can be disposed on the display panel 100. Figure 2The second input sensor 300 is shown as a unit component (or module), but the second input sensor 300 according to an embodiment of the present application is not limited thereto. For example, the second input sensor 300 can also be attached to the entire surface of the display panel 100 to sense user biometric information applied from the outside.

[0094] A cover layer CVL can be disposed under the display panel 100. The cover layer CVL can absorb external impact to protect the display panel 100. The cover layer CVL can not overlap the second input sensor 300. The cover layer CVL can include at least one of an embossed layer, a buffer layer, a light absorption layer, an electromagnetic wave shielding layer, or a heat dissipation layer. The embossed layer can absorb light incident to the cover layer CVL. The buffer layer can include a sponge, a foam, or a polyurethane resin, etc. The heat dissipation layer can include a substance having excellent heat conduction properties.

[0095] Although the cover layer CVL is shown as being disposed to overlap and be continuous with the first area 1000A1 and the second area 1000A2 in Figure 2 However, the cover layer CVL according to an embodiment of the present application is not limited thereto. For example, a portion of the cover layer CVL that overlaps the second area 1000A2 can be removed so as not to overlap the second area 1000A2.

[0096] A window 400 can be disposed over the first input sensor 200. The window 400 can include an optically transparent insulating substance. For example, the window 400 can include glass or plastic. The window 400 can have a multi-layer structure or a single layer structure. For example, the window 400 can include a plurality of plastic films bonded with an adhesive or include a glass substrate and a plastic film bonded with an adhesive.

[0097] A first adhesive layer 501 can be disposed between the display panel 100 and the second input sensor 300. A second adhesive layer 502 can be disposed between the window 400 and the first input sensor 200. The first adhesive layer 501 and the second adhesive layer 502 each can include a general adhesive or an adhesive. For example, the first adhesive layer 501 and the second adhesive layer 502 each can be a transparent adhesive member such as a pressure sensitive adhesive film (PSA), an optically clear adhesive film (OCA), or an optically clear resin (OCR).

[0098] The first adhesive layer 501 and the second adhesive layer 502 each can include a substance having a relatively low modulus. When the display device 1000 is folded, the shape of each of the first adhesive layer 501 and the second adhesive layer 502 can be deformed. The first adhesive layer 501 and the second adhesive layer 502 can mitigate stress applied to the display panel 100 and the first input sensor 200 when the display device 1000 is folded.

[0099] Figure 3a is a plan view illustrating a portion of a light-blocking layer according to an embodiment of the present application.

[0100] Referring to Figure 2 and Figure 3a , the light-blocking layer 110 can have a property of absorbing light. A plurality of opening portions HA can be defined in the light-blocking layer 110. The plurality of opening portions HA can be referred to as a plurality of holes. The plurality of opening portions HA can be disposed apart in a first direction DR1 and a second direction DR2. For example, the plurality of opening portions HA can be arranged in a matrix form. Although nine opening portions HA are exemplarily illustrated in Figure 3a , the number of the plurality of opening portions HA according to an embodiment of the present application is not limited thereto.

[0101] The plurality of opening portions HA each can have a shape identical to one another. The plurality of opening portions HA each can be circular. However, this is exemplary, and the shape of the plurality of opening portions HA according to an embodiment of the present application is not limited thereto. For example, the plurality of opening portions HA each can be polygonal.

[0102] Any one of the plurality of opening portions HAa can be referred to as a reference opening portion HAa. In a plan view, the reference opening portion HAa can be an opening portion disposed adjacent to an edge of the second input sensor 300. According to the present application, the display device 1000 can include the second input sensor 300 having a plurality of sensing elements and a control portion 600 (refer to Figure 5 ). The control portion 600 (refer to Figure 5 ) can calculate a first distance between a first sensing element disposed adjacent to the edge of the second input sensor 300 and a second sensing element overlapping the reference opening portion HAa when the display device 1000 is in an unfolded state, and calculate a second distance between the first sensing element and a third sensing element overlapping the reference opening portion HAa when the display device is in a folded state. The control portion 600 (refer to Figure 5 ) can correct an image obtained by the second input sensor 300 based on the first distance and the second distance. The control portion 600 (refer to Figure 5 ) can obtain fingerprint information by correcting an image obtained in a state in which the display device 1000 is folded. Accordingly, a display device 1000 having improved fingerprint recognition performance can be provided. The control portion 600 (refer toFigure 5 ) of the display device according to an embodiment of the present application.

[0103] Figure 3b is a plan view showing a part of the light-blocking layer according to an embodiment of the present application. In Figure 3b the description of Figure 3a the same reference numerals are marked to the constituent elements explained in the description of

[0104] Referring to Figure 3b , a plurality of holes HA and an opening part PT can be defined in the light-blocking layer 110-1. The opening part PT can be referred to as a pattern.

[0105] The plurality of holes HA and the opening part PT can have different shapes. The opening part PT can be a cross shape. However, this is exemplary, and the shape of the opening part PT according to an embodiment of the present application is not limited thereto. For example, the opening part PT can have a triangular or quadrangular shape, and is not limited as long as it is a shape provided to be distinguished from the plurality of holes HA.

[0106] Figure 4 is a cross-sectional view of a display device according to an embodiment of the present application.

[0107] Referring to Figure 2 and Figure 4 , the light-blocking layer 110 can be disposed between the window 400 and the second input sensor 300. The light-blocking layer 110 can filter light incident to the second input sensor 300. A plurality of opening parts HA can be defined in the light-blocking layer 110. The plurality of opening parts HA can each have a size of a predetermined size or less. The plurality of opening parts HA can each be referred to as a pinhole.

[0108] A part of the user's body can contact the window 400. For example, the part of the body can be a fingerprint FN of a finger. First light LT1 provided from the display element layer 100-3 to the window 400 can be reflected on the fingerprint FN. The reflected first light LT1 can be referred to as second light LT2.

[0109] The second light LT2 can be provided to the second input sensor 300 through the plurality of opening parts HA. The plurality of opening parts HA can form a focal point of the second light LT2 passing between the window 400 and the second input sensor 300. The second input sensor 300 can obtain an image through the second light LT2.

[0110] The second input sensor 300 can be an optical type sensor that recognizes the fingerprint FN by the second input sensor 300 sensing the second light LT2 reflected by ridges of the fingerprint FN and valleys between the ridges.

[0111] The incident angle of the second light LT2 can be controlled by the size of the plurality of opening portions HA and the thickness of the light blocking layer 110. According to the present application, only the second light LT2 incident at a predetermined incident angle or less by the light blocking layer 110 built in the display panel 100 can be incident to the second input sensor 300. The first partial image detected in the second input sensor 300 by the second light LT2 passing through one opening portion HA and the second partial image detected in the second input sensor 300 by the second light LT2 passing through an adjacent opening portion HA can not overlap when viewed in a planar view. In the second input sensor 300, the partial images detected in the second input sensor 300 by the second light LT2 passing through the plurality of opening portions HA can be detected as one image without overlapping each other. Accordingly, the accuracy or the sensitivity of the fingerprint recognition can be improved.

[0112] Figure 5 FIG. 7 is a view illustrating a second input sensor and a control portion according to an embodiment of the present application.

[0113] Referring to Figure 5 The second input sensor 300 can provide the image IM to the control portion 600. The control portion 600 can obtain the fingerprint information by correcting the image IM. The control portion 600 can include a distance calculating portion 610, an image dividing portion 620, an image rotating portion 630, an image combining portion 640, and a storage portion 650.

[0114] The distance calculating portion 610, the image dividing portion 620, the image rotating portion 630, the image combining portion 640, and the storage portion 650 can define the names of the constituent elements according to the operation. Accordingly, the distance calculating portion 610, the image dividing portion 620, the image rotating portion 630, the image combining portion 640, and the storage portion 650 can be implemented in a single chip, or a part of the distance calculating portion 610, the image dividing portion 620, the image rotating portion 630, the image combining portion 640, and the storage portion 650 and another part thereof can be implemented in different chips from each other.

[0115] The distance calculating portion 610, the image dividing portion 620, the image rotating portion 630, the image combining portion 640, and the storage portion 650 will be described below.

[0116] Figure 6a FIG. 7 is a view illustrating a second input sensor and a control portion according to an embodiment of the present application. Figures 6b to 6e FIG. 8 is a view illustrating a process of obtaining the fingerprint information using the first image according to an embodiment of the present application.

[0117] Referring to Figures 5 to 6e The first image IM1 can be an image detected in the second input sensor 300 by the second light LT2 passing through the plurality of opening portions HA of the display panel 100 (refer to FIG. 1) and the light blocking layer 110 (refer to FIG. 2). Figure 2The image acquired by the second input sensor 300 in the sensing area DA when the sensor is in its unfolded state. The sensing area DA can be... Figure 2 Sensing area 300-A (reference) Figure 2 The second input sensor 300 may include a plurality of sensing elements. The plurality of sensing elements may be arranged along a first direction DR1 and a second direction DR2. Each of the plurality of sensing elements can sense a second light LT2 (see reference). Figure 4 ), by sensing the second light LT2 (reference) Figure 4 The second input sensor 300 can obtain the first image IM1 from the plurality of sensing elements.

[0118] The plurality of sensing elements may include a first sensing element PD1 and a second sensing element PD2. The first sensing element PD1 may be configured adjacent to the edge of the second input sensor 300. The second sensing element PD2 is located on the display panel 100 (see reference). Figure 2 In its unfolded state, it can interact with the opening HA (see reference). Figure 3a Any opening HAa in ) (refer to Figure 3a Overlap. Any opening HAa (refer to...) Figure 3a The opening can serve as a reference. Alternatively, the second sensing element 300 can be connected to... Figure 3b The opening PT shown (refer to) Figure 3b The opening PT may overlap with multiple other holes HA (see reference). Figure 3b The shape is different from other multiple holes HA (refer to) Figure 3b ) forms the opening that distinguishes the two parts.

[0119] The second sensing element PD2 can be located through any opening HAa (see reference). Figure 3a The brightness of a portion of the first image IM1 was measured to be the highest among the sensing elements.

[0120] The first sensing element PD1 and the second sensing element PD2 can be spaced apart in a first direction DR1. For example, the first sensing element PD1 and the second sensing element PD2 can be arranged in the same row or the same column. The direction in which the first sensing element PD1 and the second sensing element PD2 are spaced apart can be relative to the folding axis FX (see reference). Figure 1a The direction of the intersection.

[0121] The distance calculation unit 610 can be displayed on the display panel 100 (see reference). Figure 2 When the sensor is in the unfolded state, a first distance DS1 between the first sensing element PD1 and the second sensing element PD2 is calculated. The storage unit 650 can store the first distance DS1.

[0122] The image segmentation unit 620 can segment the first image IM1 into multiple first sub-images IM1a, IM1b, IM1c, IM1d, IM1e, IM1f, IM1g, IM1h, and IM1i using the first cutting line CL1. The first cutting line CL1, serving as a reference line for image segmentation, can be referred to as a first reference line or a first segmentation line. Although in Figure 6b The diagram shows nine sub-images IM1a, IM1b, IM1c, IM1d, IM1e, IM1f, IM1g, IM1h, and IM1i, but the number of sub-images IM1a, IM1b, IM1c, IM1d, IM1e, IM1f, IM1g, IM1h, and IM1i is not limited to this, according to an embodiment of the present invention. For example, the number of sub-images IM1a, IM1b, IM1c, IM1d, IM1e, IM1f, IM1g, IM1h, and IM1i can be the same as the number of openings HA (see reference). Figure 3a The number is the same.

[0123] The image rotation unit 630 can form multiple rotated images IM1a-1, IM1b-1, IM1c-1, IM1d-1, IM1e-1, IM1f-1, IM1g-1, IM1h-1, and IM1i-1 by rotating each of the multiple sub-images IM1a, IM1b, IM1c, IM1d, IM1e, IM1f-1, IM1g-1, IM1h-1, and IM1i-1. For example, the image rotation unit 630 can rotate each of the multiple sub-images IM1a, IM1b, IM1c, IM1d, IM1e, IM1f, IM1g, IM1h, and IM1i by 180°.

[0124] Based on the principle of pinhole imaging, an inverted image of an object can be obtained by passing through multiple openings HA (refer to...). Figure 4 The reflected light is formed in the second input sensor 300. The object can be a part of the body (fingerprint FN), and the inverted image can be multiple sub-images IM1a, IM1b, IM1c, IM1d, IM1e, IM1f, IM1g, IM1h, and IM1i, each.

[0125] The image rotation unit 630 can be rotated by the second light LT2 (refer to...) Figure 4 (through multiple openings HA (refer to)) Figure 4 The original image is obtained by simultaneously inverting the inverted image. The original image can be each of multiple rotated images IM1a-1, IM1b-1, IM1c-1, IM1d-1, IM1e-1, IM1f-1, IM1g-1, IM1h-1, and IM1i-1.

[0126] The image combining section 640 can extract information required to obtain the fingerprint information from the plurality of rotated images IM1a-1, IM1b-1, IM1c-1, IM1d-1, IM1e-1, IM1f-1, IM1g-1, IM1h-1, IM1i-1. The image combining section 640 can extract a plurality of partial images IM1a-2, IM1b-2, IM1c-2, IM1d-2, IM1e-2, IM1f-2, IM1g-2, IM1h-2, IM1i-2 from the plurality of rotated images IM1a-1, IM1b-1, IM1c-1, IM1d-1, IM1e-1, IM1f-1, IM1g-1, IM1h-1, IM1i-1. For example, the image combining section 640 can acquire information required to obtain the fingerprint information by cutting each of the plurality of rotated images IM1a-1, IM1b-1, IM1c-1, IM1d-1, IM1e-1, IM1f-1, IM1g-1, IM1h-1, IM1i-1 to delete unnecessary images.

[0127] The image combining section 640 can provide the fingerprint image FI by combining the plurality of partial images IM1a-2, IM1b-2, IM1c-2, IM1d-2, IM1e-2, IM1f-2, IM1g-2, IM1h-2, IM1i-2. For example, the image combining section 640 can convert the plurality of partial images IM1a-2, IM1b-2, IM1c-2, IM1d-2, IM1e-2, IM1f-2, IM1g-2, IM1h-2, IM1i-2 into the fingerprint image FI through an image processing step.

[0128] The control section 600 can obtain the fingerprint information from the fingerprint image FI.

[0129] Figure 7 is a cross-sectional view of a display device according to an embodiment of the present application, Figure 8 is a view illustrating a second input sensor and a second image according to an embodiment of the present application. In Figure 8 the description of Figure 6a the same reference numerals are marked to the constituent elements described and a description thereof is omitted.

[0130] Referring to Figure 5 , Figure 7 and Figure 8 , the display device 1000 can be folded. An angle AG between an upper surface 1000A1-U of the first area 1000A1 (refer to Figure 2 ) and an upper surface 1000A3-U of the third area 1000A3 (refer to Figure 2 ) can be a convex angle. In Figure 7An example is shown where the angle AG is 90°.

[0131] exist Figure 7 The display panel 100 can be in a second state. The second state can refer to the state in which the display panel 100 is folded.

[0132] The shapes of the first adhesive layer 501 and the second adhesive layer 502 are deformable. When the display device 1000 is folded, by applying stress to the display panel 100 and the first input sensor 200, the display panel 100 and the first input sensor 200 can protrude a first protrusion distance WD1 from the side 300-S of the second input sensor 300.

[0133] The second image IM2 may be an image obtained by the second input sensor 300 in the sensing area DA when the display panel 100 is folded. The second input sensor 300 may include multiple sensing elements.

[0134] The plurality of sensing elements may include a first sensing element PD1, a second sensing element PD2, and a third sensing element PD3. The second sensing element PD2 can be in the unfolded state of the display panel 100 and the opening HA (see reference). Figure 3a Any opening HAa in ) (refer to Figure 3a Overlap. Any opening HAa (refer to...) Figure 3a The opening can serve as a reference. The third sensing element PD3 can be in a folded state with either of the openings HAa (see reference). Figure 3a (overlap). However, this is exemplary; according to an embodiment of the present invention, the second sensing element PD2 can overlap with the display panel 100 when it is in the unfolded state. Figure 3b The opening PT (refer to) Figure 3b The third sensing element PD3 can overlap with the display panel when it is folded 100 degrees. Figure 3b The opening PT (refer to) Figure 3b )overlapping.

[0135] The third sensing element PD3 can be located through any opening HAa (see reference). Figure 3a The brightness of a portion of the second image IM2 was measured to be the highest among the sensing elements.

[0136] The distance calculation unit 610 can calculate a second distance DS2 between the first sensing element PD1 and the third sensing element PD3 when the display panel 100 is in a folded state. The storage unit 650 can store the second distance DS2.

[0137] The distance calculation unit 610 can calculate the first distance DS1 (refer to...). Figure 6a) and the second distance DS2. The storage 650 can store the difference DF.

[0138] The image dividing section 620 can divide the second image IM2 using a second cut line CL2 calculated from the first distance DS1 (refer to Figure 6a ) and the difference DF of the second distance DS2. For example, the second cut line CL2 can be a line obtained by moving the first cut line CL1 in the first direction DR1 by the difference DF.

[0139] The arrangement between the light blocking layer 110 included in the display panel 100 and the second input sensor 300 can deviate from the first protruding distance WD1 by the stress generated when the display device 1000 is folded. When the second image IM2 is divided by the previously stored first cut line CL1, the image dividing section 620 can divide the second image IM2 in a state in which the arrangement is deviated. At this time, the image combining section 640 can not obtain the fingerprint image FI (refer to Figure 6e ). However, according to the present application, the distance calculating section 610 of the control section 600 can calculate the first distance DS1 (refer to Figure 6a ) between the first sensing element PD1 and the second sensing element PD2 when the display panel 100 is in the unfolded state, and calculate the second distance DS2 between the first sensing element PD1 and the third sensing element PD3 when the display panel 100 is in the folded state. The image dividing section 620 can correct the second image IM2 obtained by the second input sensor 300 based on the first distance DS1 (refer to Figure 6a ) and the second distance DS2. The control section 600 can obtain the fingerprint information by correcting the second image IM2 obtained in the state in which the display device 1000 is folded. Accordingly, it is possible to provide the display device 1000 having improved fingerprint recognition performance.

[0140] The storage 650 can store the difference DF between the first distance DS1 (refer to Figure 6a ) and the second distance DS2 for each angle AG. For example, the storage 650 can store the differences related to 18 angles obtained by dividing the angles between 0° and 180° by 10°. However, this is exemplary, and the number of the plurality of differences stored in the storage 650 is not limited thereto.

[0141] The display device 1000 can calculate the angle AG of the display panel 100 by a hinge, a strain gauge, or a pressure sensor disposed in the second area 1000A2 (refer to FIG. 1). The image dividing section 620 can divide the second image IM2 using the calculated angle AG and the difference corresponding to the calculated angle AG among the plurality of differences stored in the storage 650.

[0142] According to the present application, the control section 600 can include a storage section 650, and by using the plurality of difference values stored in the storage section 650, the time for processing the second image IM2 in order to identify the fingerprint can be reduced.

[0143] Figure 9 is a cross-sectional view of a display device according to an embodiment of the present application. In Figure 9 the description, the same reference numerals are assigned to the constituent elements described through Figure 2 and Figure 7 the same reference numerals are assigned to the constituent elements described through

[0144] Referring to Figure 5 and Figure 9 , the display device 1000 can be folded. The upper surface 1000A1-U of the first area 1000A1 (referring to Figure 2 ) and the upper surface 1000A3-U of the third area 1000A3 (referring to Figure 2 ) can face each other.

[0145] When the display device 1000 is folded, the display panel 100 and the first input sensor 200 can protrude a second protrusion distance WD2 from the side surface 300-S of the second input sensor 300 by the stress applied to the display panel 100 and the first input sensor 200.

[0146] According to the present application, the distance calculation section 610 of the control section 600 can calculate a first distance DS1 (referring to Figure 6a ) in the unfolded state of the display panel 100 and a second distance DS2 (referring to Figure 8 ) in the folded state. The image division section 620 can correct the image obtained by the second input sensor 300 based on the difference between the first distance DS1 (referring to Figure 6a ) and the second distance DS2 (referring to Figure 8 ). The difference can be the same as the second protrusion distance WD2. The control section 600 can obtain the fingerprint information by correcting the image obtained in the state in which the display device 100 is folded. The control section 600 can correct the image considering the second protrusion distance WD2. Accordingly, the display device 1000 having improved fingerprint identification performance can be provided.

[0147] The above has been described with reference to preferred embodiments of the present application, but it will be understood by those skilled in the art or those having ordinary knowledge in the art that various modifications and changes can be made thereto without departing from the spirit and scope of the present application as recited in the claims attached hereto. Accordingly, the technical scope of the present application is not limited by the contents described in the detailed description, but by the scope of the claims.

Claims

1. A display device comprising: a display panel defining a folding region and a non-folding region, and including a base layer, a circuit layer disposed above the base layer, a display element layer disposed above the circuit layer, and a light-blocking layer disposed below the display element layer and defining an opening portion; an input sensor disposed below the display panel and overlapping the non-folding region, and including a first sensing element, a second sensing element, and a third sensing element; and a control portion that, when the display panel is in a first state, calculates a first distance between the first sensing element and the second sensing element overlapping the opening portion, when the display panel is in a second state different from the first state, calculates a second distance between the first sensing element and the third sensing element overlapping the opening portion, and corrects an image obtained by the input sensor based on a difference between the first distance and the second distance. 2.The display device according to claim 1, wherein the first sensing element is disposed adjacent to an edge of the input sensor. 3.The display device according to claim 1, wherein the first state is a state in which the display panel is unfolded, the second state is a state in which the display panel is folded, the image is an image obtained by the input sensor in the second state. 4.The display device according to claim 1, wherein a plurality of holes are further defined in the light-blocking layer, and the plurality of holes and the opening portion have the same shape as each other. 5.The display device according to claim 1, wherein a plurality of holes are further defined in the light-blocking layer, and the opening portion has a shape different from a shape of each of the plurality of holes. 6.The display device according to claim 1, wherein the first sensing element, the second sensing element, and the third sensing element are spaced apart in a first direction. 7.The display device according to claim 1, wherein the control portion divides the image into a plurality of sub-images based on the difference between the first distance and the second distance, and rotates each of the plurality of sub-images, and provides a fingerprint image by combining the rotated plurality of sub-images. 8.The display device according to claim 1, wherein the control portion stores the difference between the first distance and the second distance, and divides the image into a plurality of sub-images using the difference when the display panel is in the second state. 9.The display device according to claim 1, wherein the light-blocking layer overlaps the input sensor. 10.The display device according to claim 1, wherein the control portion obtains fingerprint information by dividing the image into a plurality of sub-images using a cutting line calculated based on the difference between the first distance and the second distance when the display panel is in the second state. 11.A display device comprising: ​ A display panel defining a folding area and a non-folding area, and including a base layer, a circuit layer disposed above the base layer, a display element layer disposed above the circuit layer, and a light-blocking layer disposed below the display element layer and defining an opening portion; An input sensor disposed below the non-folding area of the display panel, and including a first sensing element disposed adjacent to an edge of the input sensor, a second sensing element overlapping the opening portion in an unfolded state, and a third sensing element overlapping the opening portion in a folded state; and A control section obtaining fingerprint information by dividing a first image obtained by the input sensor into a plurality of first sub-images using a first cutting line when the display panel is in the unfolded state, and obtaining fingerprint information by dividing a second image obtained by the input sensor into a plurality of second sub-images using a second cutting line different in position from the first cutting line when the display panel is in the folded state, the control section calculating a first distance between the first sensing element and the second sensing element and a second distance between the first sensing element and the third sensing element, the second cutting line being displaced from the first cutting line by a difference between the first distance and the second distance.

12. The display device according to claim 11, wherein the first sensing element, the second sensing element, and the third sensing element are spaced apart in a first direction.

13. The display device according to claim 11, wherein the control section stores the difference, determines the second cutting line using the difference when the display panel is in the folded state, and divides the second image based on the second cutting line.

14. The display device according to claim 11, wherein the control section rotates each of the plurality of second sub-images, and provides a fingerprint image by combining the rotated plurality of second sub-images.

15. The display device according to claim 11, wherein a plurality of holes are further defined in the light-blocking layer, and the plurality of holes and the opening portion have the same shape as each other.

16. The display device according to claim 11, wherein a plurality of holes are further defined in the light-blocking layer, the opening portion has a shape different from a shape of each of the plurality of holes.

17. The display device according to claim 11, wherein the light-blocking layer overlaps the input sensor.

Images