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EP-3798804-B1 - FINGERPRINT SENSOR AND DISPLAY DEVICE INCLUDING THE SAME

EP3798804B1EP 3798804 B1EP3798804 B1EP 3798804B1EP-3798804-B1

Inventors

  • LEE, SUN HWA
  • LEE, KI JUNE
  • JEON, MU KYUNG

Dates

Publication Date
20260506
Application Date
20200923

Claims (13)

  1. A fingerprint sensor comprising: a substrate (SUB1); a circuit element layer (BPL) disposed on a first surface of the substrate, the circuit element layer including a semiconductor layer, conductive layers, and at least one opening portion (LTH1); a light emitting element layer (LDL) disposed on the circuit element layer, the light emitting element layer including at least one light emitting element (LD); and a sensor layer (PSL) disposed on a second surface of the substrate, the sensor layer including at least one light sensor (PHS) corresponding to the at least one opening portion, wherein the at least one opening portion is defined by non-overlapping of the semiconductor layer and the conductive layers, wherein the at least one opening portion has a closed loop shape in plan view, wherein the conductive layers comprise: a first conductive layer including first electrodes extending in a first direction; a second conductive layer disposed on the first conductive layer, the second conductive layer including second electrodes extending in the first direction; and a third conductive layer disposed on the second conductive layer, the third conductive layer including third electrodes extending in a second direction perpendicular to the first direction, wherein the at least one opening portion is positioned between the first electrodes, between the second electrodes, and between the third electrodes in plan view, wherein the first electrodes include a first wire (Ei) extending in the first direction, wherein the second electrodes include a second wire (IPL) spaced apart from the first wire in plan view by a preset distance, the second wire extending in the first direction, wherein the third electrodes include a third wire (PL) extending in the second direction and a bridge pattern (BRP) spaced apart from the third wire, wherein the at least one opening portion is defined by a portion of the first wire, a portion of the second wire, a portion of the third wire, and a portion of the bridge pattern, and wherein: at least a portion of the closed loop shape includes a curve, wherein the first wire includes at least one fourth protrusion (PRT4) portion protruding in the second direction, and wherein the fourth protrusion portion includes a curve portion corresponding to the curve of the closed loop shape; or an internal angle of at least a portion of the closed loop shape is an obtuse angle, wherein the third wire includes at least two first protrusion portions (PRT1-1, PRT1-2) protruding toward the bridge pattern in plan view, and wherein the at least a portion of the closed loop shape is defined by the at least two first protrusion portions.
  2. The fingerprint sensor according to claim 1, wherein the at least one opening portion comprises a hole in the circuit element layer.
  3. The fingerprint sensor according to claim 1, wherein the first protrusion portions partially overlap the first wire and the second wire, respectively.
  4. The fingerprint sensor according to claim 3, wherein the internal angle of the closed loop shape corresponding to each of the first protrusion portions is an obtuse angle; optionally wherein one side of each of the first protrusion portions extends in a direction crossing each of the first direction and the second direction; optionally wherein at least one of the first protrusion portions has a trapezoidal planar shape.
  5. The fingerprint sensor according to claim 1, wherein the second wire includes at least one second protrusion portion (PRT2) protruding toward the first wire in plan view, wherein the second protrusion portion does not overlap the third wire, and wherein the first and second protrusion portions correspond to the at least a portion of the closed loop shape; optionally wherein the bridge pattern includes at least one third protrusion portion (PRT3) protruding toward the third wire in plan view, wherein the third protrusion portion overlaps the first wire and wherein the first to third protrusion portions correspond to the at least a portion of the closed loop shape.
  6. The fingerprint sensor according to claim 5, wherein the at least one opening portion has an octagonal planar shape.
  7. The fingerprint sensor according to claim 1, wherein the second wire includes a fifth protrusion portion (PRT5) protruding in a direction opposite to the second direction, and wherein the fifth protrusion portion includes a curve portion that faces the fourth protrusion portion and corresponds to the curve of the closed loop shape.
  8. The fingerprint sensor according to claim 7, wherein the at least one opening portion has a planar shape of a circle or an ellipse.
  9. The fingerprint sensor according to claim 1, wherein the third wire includes at least two groove portions (GRV1, GRV2), wherein the groove portions partially overlap the first wire and the second wire, respectively, and wherein the internal angle of the closed loop shape corresponding to the groove portions is an acute angle; optionally wherein the second wire does not overlap the bridge pattern.
  10. The fingerprint sensor according to claim 1, wherein the semiconductor layer includes active patterns (ACT) including each of a source electrode (SE) and a drain electrode (DE), and wherein the at least one opening portion is further defined by a portion of the active patterns.
  11. A display device comprising: a substrate (SUB) on which a pixel (PXL) is disposed; a circuit element layer (BPL) disposed on a first surface of the substrate, the circuit element layer including conductive layers on which circuit elements of the pixel are disposed; a light emitting element layer (LDL) disposed on the circuit element layer, the light emitting element layer including at least one light emitting element (LD) configuring the pixel; and a sensor layer (PSL) disposed on a second surface of the substrate, the sensor layer including at least one light sensor (PHS), wherein at least one opening portion (LTH1) having a closed loop shape in plan view is defined by non-overlapping of the conductive layers, wherein the conductive layers comprise: a first conductive layer including first electrodes extending in a first direction; a second conductive layer disposed on the first conductive layer, the second conductive layer including second electrodes extending in the first direction; and a third conductive layer disposed on the second conductive layer, the third conductive layer including third electrodes extending in a second direction perpendicular to the first direction, wherein the at least one opening portion is positioned between the first electrodes, between the second electrodes, and between the third electrodes in plan view, wherein the first electrodes include a first wire (Ei) extending in the first direction, wherein the second electrodes include a second wire (IPL) spaced apart from the first wire in plan view by a preset distance, the second wire extending in the first direction, wherein the third electrodes include a third wire (PL) extending in the second direction and a bridge pattern (BRP) spaced apart from the third wire, wherein the at least one opening portion is defined by a portion of the first wire, a portion of the second wire, a portion of the third wire, and a portion of the bridge pattern, and wherein: at least a portion of the closed loop shape includes a curve, wherein the first wire includes at least one fourth protrusion portion (PRT4) protruding in the second direction, and wherein the fourth protrusion portion includes a curve portion corresponding to the curve of the closed loop shape; or an internal angle of the at least a portion of the closed loop shape is an obtuse angle, wherein the third wire includes at least two first protrusion portions (PRT1-1, PRT1-2) protruding toward the bridge pattern in plan view, and wherein the at least a portion of the closed loop shape is defined by the at least two first protrusion portions.
  12. The display device according to claim 11, wherein the first conductive layer includes a light emission control line extending in a first direction; and the second conductive layer is spaced apart from the light emission control line at a preset distance in plan view, and includes an initialization power line extending in the first direction, the third conductive layer includes a power line extending in a second direction perpendicular to the first direction and a bridge pattern spaced apart from the power line, wherein the at least one opening portion is defined by a portion of the light emission control line, a portion of the initialization power line, a portion of the power line, and a portion of the bridge pattern.
  13. The display device according to claim 12, wherein the initialization power line includes at least one second protrusion portion protruding toward the light emission control line in plan view, wherein the power line includes at least two first protrusion portions protruding toward the bridge pattern in plan view, wherein the bridge pattern includes at least one third protrusion portion protruding toward the power line in plan view, and wherein the first to fourth protrusion portions configure the at least a portion of the closed loop shape.

Description

BACKGROUND FIELD Exemplary embodiments of the invention relate generally to a fingerprint sensor and a display device including the same. DISCUSSION OF THE BACKGROUND In recent years, as a display device such as a smartphone or a tablet PC has been widely used, a biometric information authentication method using a fingerprint of a user has been widely used. In order to provide a fingerprint sensing function, a fingerprint sensor may be provided in a form embedded or attached to a display device. For example, the fingerprint sensor may be configured with a sensor using a light sensing method. The fingerprint sensor for the light sensing method may include a light source, a lens, and a light sensor array. When such a fingerprint sensor is attached to a display panel, a thickness of the display device may increase and a manufacturing cost may increase. The above information disclosed in this Background section is only for understanding of the background of the inventive concepts, and, therefore, it may contain information that does not constitute prior art. CN 110211975 discloses an array substrate, a display panel and a display device, and relates to the technical field of display. The accuracy of line identification can be improved. The array substrate has a display area, and comprises a substrate, and a pixel circuit, a first insulating layer and a conductive light-shielding layer which are sequentially arranged on the substrate and located in the display area; the pixel circuit comprises a first thin film transistor and a second thin film transistor; the conductive light-shielding layer comprises a light-transmitting hole; the orthographic projection of a region between the first thin film transistor and the second thin film transistor on the substrate, and the orthographic projection of the light-transmitting hole on the substrate have an overlapped region, and imaging holes are formed in the part of the overlapped orthographic projection on the substrate; the array substrate further comprises a plurality of line identification units arranged on one side, deviating from the first insulating layer, of the pixel circuit, and each line identification unit is at least corresponding to one imaging hole; the first thin film transistor comprises a first source drain pattern; the first insulating layer comprises a first via hole; and the conductive light-shielding layer is electrically connected with the first source drain pattern through the first via hole. SUMMARY Devices constructed according to exemplary embodiments of the invention are capable of providing a fingerprint sensor using a light sensing method that is capable of reducing a thickness of a module and improving reliability, and a display device including the fingerprint sensor. In addition, devices constructed according to exemplary embodiments of the invention are capable of providing a fingerprint sensor capable of minimizing incident light diffraction at an edge of an opening portion provided for controlling incident light in a display panel, and a display device including the fingerprint sensor. Additional features of the inventive concepts will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the inventive concepts. According to an embodiment, there is provided a fingerprint sensor as set out in claim 1. Additional features are set out in claims 2 to 10. According to an embodiment, there is provided a display device as set out in claim 11. Additional features are set out in claims 12 and 13. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention, and together with the description serve to explain the inventive concepts. FIGS. 1 and 2 are plan views schematically illustrating a display device according to an exemplary embodiment of the inventive concepts.FIGS. 3A, 3B, 3C, 3D, and 3E are plan views illustrating various embodiments of a disposition structure of pixels and light sensors.FIG. 4A shows an unclaimed embodiment. Fig. 4A is a cross-sectional view of a display device.FIG. 4B shows an unclaimed embodiment. Fig. 4B is a cross-sectional view of a display device..FIG. 5 is a plan view illustrating a light blocking layer according to an exemplary embodiment of the inventive concepts.FIGS. 6A, 6B, 6C, and 6D are plan views illustrating various embodiments of a disposition structure of pixels, pinholes, and light sensors.FIGS. 7, 8, 9, 10, 11, 12A, 12B, and 12C are cross-sectional views of a display device according to other embodiments of the inventive concepts.