Touch sensor comprising a fingerprint sensor

Abstract

The present invention relates to a touch sensor including a fingerprint sensor. The present invention is provided in order to eliminate a brightness difference of a portion in which the touch sensor and the fingerprint sensor are applied to provide a display having uniform brightness in the touch sensor including the fingerprint sensor, characterized in that the transmittance of the fingerprint sensor and the touch sensor is made the same or similar by changing a structure, that is, applying a dummy electrode to a portion in which the touch sensor is constituted, or the brightness of a portion in which the fingerprint sensor is located in the entire area of a light emitting layer is made greater than the remaining portion by control of a control unit of a touch display device to which the fingerprint sensor is applied according to various embodiments of the present invention, so that the display can output uniform brightness.

Description

Technical Field

[0001] This invention relates to a touch sensor that includes a fingerprint sensor. Background Technology

[0002] In recent years, mobile device screens have trended towards larger sizes, leading to a trend towards minimizing or eliminating physical buttons such as the home button. This trend of eliminating physical buttons is accelerating the development of buttons integrated with the display. Furthermore, the emergence of fingerprint-enabled buttons necessitates the development of fingerprint sensors integrated with the display.

[0003] Fingerprint sensors typically employ capacitive methods and can be broadly categorized into single-cell driven and matrix driven methods. Single-cell driven sensors consist of multiple individual cells that drive the sensor itself for fingerprint recognition. They can utilize various materials such as indium tin oxide (ITO) or silicon and offer advantages such as low noise. However, their complex manufacturing process involves many layers and suffers from reduced transparency, thus limiting their application as transparent electrodes.

[0004] The matrix-driven method involves alternating upper electrodes extending along the x-axis and lower electrodes extending along the y-axis in a line-by-line configuration. This method offers a simple structure, as it can be fabricated using only the upper and lower electrodes, resulting in high transmittance. However, it suffers from high noise, necessitating high-frequency operation above 10kHz. Indium tin oxide (InTO), widely used in transparent electrodes, has high resistance, making it difficult to drive at frequencies above 10kHz. Furthermore, its lack of flexibility hinders its application in stretchable displays. Therefore, fingerprint sensors require transparent electrodes with both high transmittance and high conductivity.

[0005] A conventional transparent electrode for a fingerprint sensor has been disclosed in Korean Patent Publication No. 10-2018-0127259 (“Transparent electrode structure for a fingerprint sensor and fingerprint sensor including the transparent electrode structure”, publication date 2018.11.28, hereinafter referred to as Prior Art 1).

[0006] Figure 1 A cross-section of a transparent electrode structure 1 for a fingerprint sensor disclosed in prior art 1 is shown. (Refer to...) Figure 1 The existing transparent electrode structure 1 may include a first electrode 11, a dielectric layer 13, a second electrode 12, and a cover 14 stacked in one direction.

[0007] Figure 2 The upper plane of the transparent electrode structure 1 for a fingerprint sensor disclosed in prior art 1 is shown. For example... Figure 2As shown, the first electrode 11 includes a first wire 21 extending along a first direction, and the second electrode 12 includes a second wire 22 extending along a second direction. The transparent electrode structure 1 for a fingerprint sensor is constructed by comprising a first electrode 11 and a second electrode 12, as described above, each including wires extending in different directions. This is because, in order to identify a user's fingerprint by utilizing the capacitance difference at the points where the wires intersect, the density of the intersecting portions of the wires is higher than that of a typical touch sensor. As described above, since the density of the pattern included in a touch sensor is lower than that of the transparent electrode structure 1, it is typically constructed using only a single-layer electrode, rather than by intersecting the first electrode 11 and the second electrode 12 as in the transparent electrode structure 1.

[0008] In order to Figure 1 and Figure 2 The conventional transparent electrode structure 1 for fingerprint sensors shown is used on a display together with a regular touch sensor. The structure constituting the touch sensor and the transparent electrode structure 1 need to be arranged together. However, since the touch sensor, which is composed of a single layer, and the transparent electrode structure 1, which is composed of two different electrodes overlapping each other, have different light transmittance, there is a problem that the part where the transparent electrode structure 1 is located becomes dark.

[0009] Existing technical documents

[0010] Patent documents

[0011] Korean Patent Publication No. 10-2018-0127259 (“Transparent Electrode Structure for Fingerprint Sensor and Fingerprint Sensor Including the Transparent Electrode Structure”, Publication Date: 2018.11.28) Summary of the Invention

[0012] (a) Technical problems to be solved

[0013] The present invention was proposed to solve the problems described above. The purpose of the touch sensor including a fingerprint sensor according to the present invention is to eliminate the brightness difference between the parts where the touch sensor and the fingerprint sensor are applied in a display device that simultaneously applies a touch sensor and a fingerprint sensor, so as to provide a touch sensor including a fingerprint sensor that outputs uniform brightness across the entire display.

[0014] (II) Technical Solution

[0015] A touch sensor including a fingerprint sensor according to the present invention for solving the problems described above may include: a lower electrode layer including a plurality of first touch sensor electrodes, a first virtual electrode, and at least one first fingerprint sensor electrode arranged in two dimensions; a dielectric layer formed on one side of the lower electrode layer; and an upper electrode layer formed on one side of the dielectric layer, and including a plurality of second touch sensor electrodes, a second virtual electrode, and at least one second fingerprint sensor electrode arranged in two dimensions, wherein the first fingerprint sensor electrodes and the second fingerprint sensor electrodes are arranged facing each other at the same position to constitute a fingerprint sensor, and the first touch sensor electrodes and the second virtual electrode are arranged facing each other at the same position, and the second touch sensor electrodes and the first virtual electrode are arranged facing each other at the same position.

[0016] In addition, the light transmittance of the first touch sensor composed of the first touch sensor electrode and the second virtual electrode, the second touch sensor composed of the second touch sensor electrode and the first virtual electrode, and the fingerprint sensor can be the same, or the difference in their light transmittance is within a predetermined range.

[0017] In addition, multiple patterns in the first fingerprint sensor electrode can be formed separately in a first direction, and multiple patterns in the second fingerprint sensor electrode can be formed separately in a second direction that intersects the first direction at a predetermined angle.

[0018] In addition, the spacing between adjacent patterns can be 0.1 to 30 μm.

[0019] In addition, the width of the pattern can be 0.1 to 100 μm.

[0020] In addition, the fingerprint sensor can be located on the periphery of the display.

[0021] Additionally, the fingerprint sensor can be positioned such that at least one of the first touch sensor electrodes or the second touch sensor electrodes is separated from the periphery of the display by the inward side.

[0022] In addition, the first touch sensor composed of the first touch sensor electrode and the second virtual electrode, the second touch sensor composed of the second touch sensor electrode and the first virtual electrode, and the fingerprint sensor can have the same shape.

[0023] In addition, the first touch sensor electrode and the first virtual electrode can be arranged to cross each other.

[0024] In addition, a single first fingerprint sensor electrode may be arranged in place of at least one of the first virtual electrodes.

[0025] In addition, the second touch sensor electrode and the second virtual electrode can be arranged crosswise.

[0026] In addition, a single second fingerprint sensor electrode may be arranged in place of at least one of the second virtual electrodes.

[0027] Additionally, the lower electrode layer may include a first wire connecting the first touch sensor electrodes adjacent to each other in a third direction, and the upper electrode layer may include a second wire connecting the second touch sensor electrodes adjacent to each other in a fourth direction intersecting the third direction.

[0028] Additionally, the touch sensor, including the fingerprint sensor, may further include: a base film formed on the other side of the lower electrode layer; and a capping layer formed on one side of the upper electrode layer.

[0029] (III) Beneficial Effects

[0030] According to the present invention, which includes a fingerprint sensor, a virtual electrode can be used to make the light transmittance of the touch sensor and the fingerprint sensor the same or similar within a predetermined range, thereby enabling the display to output uniformly and eliminating the brightness difference (spots) that may occur in a display that simultaneously uses a fingerprint sensor and a touch sensor.

[0031] Furthermore, according to the present invention, even without the use of virtual electrodes, the control unit performs control to make the output of the portion of the surface of the light-emitting layer where the touch sensor is applied different from the output of the rest, thereby enabling the display to output uniformly and eliminating the brightness difference (spots) that may occur in displays that simultaneously apply fingerprint sensors and touch sensors. Attached Figure Description

[0032] Figure 1 This is a cross-sectional view of a transparent electrode structure for a fingerprint sensor disclosed in prior art 1.

[0033] Figure 2 This is a top plan view of the transparent electrode structure for a fingerprint sensor disclosed in prior art 1.

[0034] Figure 3 This is an exploded perspective view of a touch sensor including a fingerprint sensor according to a first embodiment of the present invention.

[0035] Figure 4 This is an upper plan view of the base film and lower electrode layer of a touch sensor including a fingerprint sensor according to a first embodiment of the present invention.

[0036] Figure 5This is a top plan view of the dielectric layer and the upper electrode layer of a touch sensor including a fingerprint sensor according to a first embodiment of the present invention.

[0037] Figure 6 This is a top plan view of a touch sensor including a fingerprint sensor according to a first embodiment of the present invention, excluding the cover layer.

[0038] Figure 7 This is an upper plan view of the base film and lower electrode layer of a touch sensor including a fingerprint sensor according to a second embodiment of the present invention.

[0039] Figure 8 This is a top plan view of the dielectric layer and upper electrode layer of a touch sensor including a fingerprint sensor according to a second embodiment of the present invention.

[0040] Figure 9 This is a top plan view of a touch sensor including a fingerprint sensor according to a second embodiment of the present invention, excluding the cover layer.

[0041] Figure 10 This is an exploded perspective view of a touch display device that applies a touch sensor including a fingerprint sensor according to a second embodiment of the present invention.

[0042] Explanation of reference numerals in the attached figures

[0043] 1: Transparent electrode structure for fingerprint sensors

[0044] 11: First electrode 12: Second electrode

[0045] 13: Dielectric layer 14: Cap

[0046] 100: Light-emitting layer; 200: Touch sensor

[0047] 210: Base film; 220: Lower electrode layer

[0048] 221: First touch sensor electrode; 222: First fingerprint sensor electrode

[0049] 223: First wire; 224: First virtual electrode

[0050] 230: Dielectric layer; 240: Upper electrode layer

[0051] 241: Second touch sensor electrode; 242: Second fingerprint sensor electrode

[0052] 243: Second wire; 244: Second virtual electrode

[0053] 310: Fingerprint sensor; 321: First touch sensor

[0054] 322: Second touch sensor; R1: First candidate area

[0055] R2: Second candidate region Detailed Implementation

[0056] Hereinafter, a preferred embodiment of the touch sensor including a fingerprint sensor of the present invention will be described in detail with reference to the accompanying drawings.

[0057] [First Embodiment]

[0058] Figure 3 The disassembled state of a touch sensor including a fingerprint sensor according to a first embodiment of the present invention is shown.

[0059] Figure 3 The components of the touch sensor including the fingerprint sensor shown in the first embodiment of the present invention may not be as follows: Figure 3 The method of disassembly / assembly shown is used for manufacturing. Figure 3 It is shown merely to aid understanding.

[0060] like Figure 3 As shown, the touch sensor including a fingerprint sensor according to the first embodiment of the present invention may include a base film 210, a lower electrode layer 220, a dielectric layer 230, an upper electrode layer 240, and a capping layer 250.

[0061] like Figure 3 As shown, the base film 210, the lower electrode layer 220, the dielectric layer 230, the upper electrode layer 240, and the capping layer 250 can be formed on one side.

[0062] Figure 3 The base film 210 shown is used to form the lower electrode layer 220 located on one side. The base film 210 can be formed of a material with a certain level or higher transmittance, and can be formed of a material with a certain level or higher transmittance and a certain level or higher elasticity. The base film 210 can be formed of a material typically containing polyimide (PI).

[0063] like Figure 3 As shown, the lower electrode layer 220 is formed on one side of the base film 210 for sensing user touch input and user fingerprints. Since the lower electrode layer 220 is formed on one side of the base film 210, the base film 210 and the lower electrode layer 220 are not shown separately.

[0064] like Figure 3 As shown, the lower electrode layer 220 may include a first touch sensor electrode 221, a first fingerprint sensor electrode 222, and a first virtual electrode 224, which will be described later. The lower electrode layer 220 as a whole may have a certain level of light transmittance.

[0065] like Figure 3 As shown, a dielectric layer 230 is formed on one side of the lower electrode layer 220 between the lower electrode layer 220 and the upper electrode layer 240 to electrically insulate the lower electrode layer 220 and the upper electrode layer 240. The dielectric layer 230 may be formed of a material having a certain level or higher transmittance, and may also be formed of a material that selectively transmits light of a desired wavelength. For example, the dielectric layer 230 may include glass, quartz, silicon oxide, aluminum oxide, hafnium oxide, or a polymer.

[0066] like Figure 3 As shown, the upper electrode layer 240 can be formed on one side of the dielectric layer 230. Since the upper electrode layer 240 is formed on one side of the dielectric layer 230, therefore... Figure 3 The dielectric layer 230 and the upper electrode layer 240 are not shown separately, but rather as an integral unit. The upper electrode layer 240 may include a second touch sensor electrode 241, a second fingerprint sensor electrode 242, and a second virtual electrode 244, which will be described later. Additionally, the upper electrode layer 240 may have a certain level of light transmittance.

[0067] like Figure 3 As shown, the capping layer 250 is formed on one side of the upper electrode layer 240 to protect the upper electrode layer 240. Additionally, the capping layer 250 can have a certain level of light transmittance.

[0068] Figure 4 The image shows the integrated base film 210 and lower electrode layer 220 as viewed from above.

[0069] like Figure 4 As shown, the first touch sensor electrode 221 included in the lower electrode layer 220 is formed for sensing the user's touch in the touch sensor including the fingerprint sensor according to this embodiment, and the first touch sensor electrode 221 constitutes a touch sensor. A plurality of first touch sensor electrodes 221 are arranged two-dimensionally on the surface of the base film 210. However, the plurality of first touch sensor electrodes 221 can be arranged parallel to each other to ensure a certain space between two adjacent first touch sensor electrodes 221. In this case, the width of the space between two adjacent first touch sensor electrodes 221 can be greater than or equal to the width of a single first touch sensor electrode.

[0070] In this invention, at least one first fingerprint sensor electrode 222 may be formed on the surface of the base film 210. Figure 4In the illustrated embodiment, a total of four first fingerprint sensor electrodes 222 are formed on the surface of the base film 210. The first fingerprint sensor electrodes 222 can be disposed around the first touch sensor electrodes 221 disposed on the surface of the base film 210. This is because, in order to transmit the signal sensed by the first fingerprint sensor electrodes 222 to the outside, it is necessary to form a wire connecting the first fingerprint sensor electrodes 222 to the outside; therefore, it is advantageous to form the first fingerprint sensor electrodes 222 around the first touch sensor electrodes 221. However, the position of the first fingerprint sensor electrodes 222 in this invention is not limited to the following. Figure 4 The periphery of the base film 210 shown can be connected with Figure 4 As shown, the first fingerprint sensor electrode 222 can be positioned at a location that is spaced apart from at least one first touch sensor electrode 221 from the periphery of the base film 210 inwards.

[0071] like Figure 4 As shown, multiple patterns P are formed parallel to each other in a single first fingerprint sensor electrode 222. In this case, the spacing between two adjacent patterns P constituting the single first fingerprint sensor electrode 222 can be 0.1–30 μm, and the width of a single pattern P can be 0.1–100 μm. The fine width of the patterns and the fine spacing between the patterns can be used as criteria to distinguish between touch sensor electrodes and fingerprint sensor electrodes. As described above, the difference between touch sensor electrodes and fingerprint sensor electrodes lies in the different uses of the touch sensor and fingerprint sensor formed by each electrode.

[0072] Figure 4 The multiple patterns P that constitute the first fingerprint sensor electrode 222 shown are... Figure 4 The first fingerprint sensor electrode extends along the upper left diagonal direction, and is spaced apart in a direction perpendicular to this direction. The direction in which the upper left diagonal direction is referred to as the first direction. The direction in which the second fingerprint sensor electrode, described later, extends is referred to as the second direction.

[0073] like Figure 4 As shown, multiple first touch sensor electrodes 221 arranged in a two-dimensional manner are connected to each other by first wires 223 extending in a vertical direction. The vertical direction is a third direction, and the multiple first touch sensor electrodes 221 are electrically connected to each other via the first wires 223, thus forming a row.

[0074] like Figure 4As shown, a first dummy electrode 224 is disposed in the space between adjacent first touch sensor electrodes 221, or in the space adjacent to the first touch sensor electrodes 221. The first dummy electrode 224 is configured to face the second touch sensor electrode 241 included in the upper electrode layer 240 when the base film 210, the lower electrode layer 220, the dielectric layer 230, and the upper electrode layer 240 are stacked. However, the first dummy electrodes 224 are not electrically connected to each other via the first wire 223, and the first dummy electrode 224 is an electrode used to make the overall light transmittance uniform in touch sensors according to various embodiments of the present invention.

[0075] Figure 5 The diagram shows the integrated dielectric layer 230 and upper electrode layer 240 as viewed from above. Similar to the first touch sensor electrode 221 described above, the upper electrode layer 240 includes a plurality of second touch sensor electrodes 241 arranged at predetermined intervals, with the width between adjacent second touch sensor electrodes 241 being greater than or equal to the width of a single second touch sensor electrode 241. The second touch sensor electrodes 241 are electrically connected in the horizontal direction via second wires 243, allowing the electrically connected second touch sensor electrodes to form a row. The horizontal direction formed by the second wires 243 is referred to as the fourth direction. The third and fourth directions may intersect each other at predetermined angles.

[0076] like Figure 5 As shown, a second virtual electrode 244 is disposed in the space between adjacent second touch sensor electrodes 241 or in the space adjacent to the second touch sensor electrodes 241. The second virtual electrode 244 is configured to face the first touch sensor electrode 221 included in the lower electrode layer 220 when the base film 210, the lower electrode layer 220, the dielectric layer 230 and the upper electrode layer 240 are stacked. However, the second virtual electrodes 244 are not electrically connected to each other through the second wire 243. The second virtual electrode 244 is an electrode used to make the overall light transmittance uniform in the touch sensor of various embodiments of the present invention.

[0077] The second fingerprint sensor electrode 242 and the first fingerprint sensor electrode 222 are disposed at the same position with respect to the stacking direction, so that the second fingerprint sensor electrode 242 and the first fingerprint sensor electrode 222 face each other, and the second fingerprint sensor electrode 242 and the first fingerprint sensor electrode 222 together constitute a fingerprint sensor. A single pattern included in the second fingerprint sensor electrode 242 is formed along the upper right diagonal direction, i.e., the second direction, and multiple patterns are arranged at predetermined intervals in a direction perpendicular to the direction in which the patterns extend. In this invention, the pattern direction of the first fingerprint sensor electrode 222 (the first direction) and the pattern direction of the second fingerprint sensor electrode 242 (the second direction) are shown to intersect each other perpendicularly; however, this invention is not limited to this, and the first direction and the second direction can be configured to intersect at a predetermined angle. Furthermore, similar to the first fingerprint sensor electrode 222, the width of the pattern included in the second fingerprint sensor electrode 242 can be 0.1 to 100 μm, and the spacing between adjacent patterns included in the second fingerprint sensor electrode 242 can be 0.1 to 30 μm.

[0078] The first touch sensor electrode 221, the second touch sensor electrode 241, the first fingerprint sensor electrode 222, the second fingerprint sensor electrode 242, the first virtual electrode 224, and the second virtual electrode 244 described above may each have the same or similar light transmittance within a predetermined range. Furthermore, the overall shape and area occupied by each electrode may be the same.

[0079] Figure 6 Showing the view from above Figure 4 and Figure 5 The base film 210, lower electrode layer 220, dielectric layer 230 and upper electrode layer 240 shown are integrated into one unit.

[0080] like Figure 6 As shown, the first fingerprint sensor electrode 222 and the second fingerprint sensor electrode 242 overlap at the same position to face each other to form a fingerprint sensor 310. The first touch sensor electrode 221 and the second virtual electrode 244 form a first touch sensor 321, and the second touch sensor electrode 241 and the first virtual electrode 224 form a second touch sensor 322. Since the fingerprint sensor 310, the first touch sensor 321, and the second touch sensor 322 are all composed of two overlapping electrodes, the transmittance of each sensor is the same or similar within a predetermined range. Therefore, the touch sensors according to this embodiment have the same or similar transmittance overall. Thus, when this embodiment is applied to one side of the light-emitting layer, the entire display can output uniform brightness.

[0081] The lower electrode layer 220 and upper electrode layer 240 of the present invention can be formed on one side of the base film 210 and dielectric layer 230 respectively using a transparent electrode material, and then patterned in various ways to form the electrodes included in each electrode layer. In this case, the transparent electrode material may contain at least one of metal nanowires, metal nanofibers, metal meshes, and metal oxides; in particular, the transparent electrode material must contain at least one of metal nanowires and metal nanofibers. Methods for forming layers using transparent electrode material include vacuum deposition, spraying, spin coating, and deposition printing. Methods for forming the electrodes included in each electrode layer include photoresist (PR) processes, laser patterning, electron beam (E-beam) patterning, and transfer printing. However, the method for forming the lower electrode layer 220 and upper electrode layer 240 of the present invention is not limited to the above methods; the lower electrode layer 220 and upper electrode layer 240 can also be formed on one side of the base film 210 and dielectric layer 230 respectively using methods other than those described above.

[0082] [Second Embodiment]

[0083] The touch display device incorporating a touch sensor including a fingerprint sensor according to a second embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0084] The lower electrode layer and upper electrode layer of the touch sensor according to the first embodiment of the present invention described above respectively include a first virtual electrode and a second virtual electrode, thereby achieving uniform light transmittance. However, in the touch display device including a fingerprint sensor according to the second embodiment of the present invention described below, the brightness of the touch display device is made uniform by adjusting the local brightness of the light-emitting layer by a separate control unit, without using virtual electrodes. The touch display device including a fingerprint sensor according to the second embodiment of the present invention may include a light-emitting layer, a base film, a lower electrode layer, a dielectric layer, an upper electrode layer, and a control unit. The base film and dielectric layer of this embodiment are the same as those of the touch sensor of the first embodiment of the present invention described above, and are the same as those of the touch sensor of the first embodiment of the present invention except that the lower electrode layer and the upper electrode layer do not include virtual electrodes. Therefore, detailed descriptions of this are omitted.

[0085] Figure 7 The image shows the state of the base film 210 and the lower electrode layer 220 of the touch sensor according to the second embodiment of the present invention, viewed from above.

[0086] like Figure 7As shown, the lower electrode layer 220 does not include the first virtual electrode, and in the first embodiment, the portion where the first virtual electrode is located is represented as the first candidate region R1. The first candidate region R1 is the portion facing the second touch sensor electrode 241 when the base film 210, the lower electrode layer 220, the dielectric layer 230, and the upper electrode layer 240 are stacked.

[0087] Figure 8 The image shows the state of the dielectric layer 230 and the upper electrode layer 240 of the touch sensor according to the second embodiment of the present invention, viewed from above.

[0088] like Figure 8 As shown, the upper electrode layer 240 does not include the second virtual electrode, and in the first embodiment, the portion where the second virtual electrode is located is represented as the second candidate region R2. The second candidate region R2 is the portion facing the first touch sensor electrode 221 when the base film 210, the lower electrode layer 220, the dielectric layer 230, and the upper electrode layer 240 are stacked.

[0089] Figure 9 It is shown Figure 7 and Figure 8 The figure shows the base film 210, lower electrode layer 220, dielectric layer 230, and upper electrode layer 240 integrated and viewed from above. The fingerprint sensor 310 is formed by overlapping the first fingerprint sensor electrode 222 and the second fingerprint sensor electrode 242. Therefore, the light transmittance of the fingerprint sensor 310 can be lower than that of the first touch sensor 321 and the second touch sensor 322, which are composed of a single electrode.

[0090] Figure 10 The diagram shows an exploded view of a touch display device employing a touch sensor according to a second embodiment of the present invention. The touch display device may include a light-emitting layer 100 and a touch sensor 200 according to a second embodiment of the present invention.

[0091] A touch display device employing a touch sensor according to a second embodiment of the present invention may include a control unit capable of controlling the local brightness of the light-emitting layer 100. The control unit may execute control such that the brightness of a separate control area S, within the entire area of ​​the light-emitting layer where the fingerprint sensor 310 is located, is greater than the brightness of the remaining portion where the first touch sensor 321 and the second touch sensor 322 are located, based on the direction in which the light-emitting layer 100 and the touch sensor 200 are stacked. This compensates for any speckling that may occur when the fingerprint sensor 310 is applied, resulting in a more uniform output from the display device. The control unit may also execute control such that the output of the light-emitting layer for the same display requirement signal is greater than the output of the light-emitting layer in the area where the first touch sensor 321 or the second touch sensor 322 is located.

[0092] The touch display device using the touch sensor according to the second embodiment of the present invention may further include a storage unit (not shown). The storage unit may be hardware such as a memory. The storage unit may store the light transmittance of each of the first touch sensor 321, the second touch sensor 322, and the fingerprint sensor 310. The control unit may use the light transmittance information stored in the storage unit to control the local brightness of the light-emitting layer, thereby uniformly controlling the brightness of the entire display.

[0093] The technical concept of this invention should not be construed as limited to the embodiments described above. This invention has a wide range of applications, and those skilled in the art can implement various modifications without departing from the spirit of the invention as protected by the claims. Therefore, any modifications and alterations that are obvious to those skilled in the art are within the scope of protection of this invention.

Claims

1. A touch sensor including a fingerprint sensor, comprising: The lower electrode layer includes a plurality of first touch sensor electrodes, a first virtual electrode, and at least one first fingerprint sensor electrode arranged in two dimensions. as well as An upper electrode layer is formed on one side of the lower electrode layer and includes a plurality of second touch sensor electrodes, a second virtual electrode, and at least one second fingerprint sensor electrode arranged in two dimensions. The first fingerprint sensor electrode and the second fingerprint sensor electrode are arranged facing each other and overlapping at the same location to form a fingerprint sensor. In the lower electrode layer, the first fingerprint sensor electrode is arranged around the first touch sensor electrode and the first virtual electrode; in the upper electrode layer, the second fingerprint sensor electrode is arranged around the second touch sensor electrode and the second virtual electrode. The first touch sensor electrode and the second virtual electrode are arranged facing each other and overlapping each other at the same location, and the second touch sensor electrode and the first virtual electrode are arranged facing each other and overlapping each other at the same location.

2. The touch sensor including a fingerprint sensor according to claim 1, wherein, The first touch sensor, composed of the first touch sensor electrode and the second virtual electrode, the second touch sensor, composed of the second touch sensor electrode and the first virtual electrode, and the fingerprint sensor have the same light transmittance, or the difference in their light transmittance is within a predetermined range.

3. The touch sensor including a fingerprint sensor according to claim 1, wherein, Multiple patterns are formed in the first fingerprint sensor electrode, spaced apart in a first direction. In the second fingerprint sensor electrode, multiple patterns are formed spaced apart in a second direction that intersects the first direction at a predetermined angle.

4. The touch sensor including a fingerprint sensor according to claim 3, wherein, The spacing between adjacent patterns is 0.1~30μm.

5. The touch sensor including a fingerprint sensor according to claim 3, wherein, The width of the pattern is 0.1~100μm.

6. The touch sensor including a fingerprint sensor according to claim 1, wherein, The fingerprint sensor is located on the periphery of the display.

7. The touch sensor including a fingerprint sensor according to claim 1, wherein, The fingerprint sensor is positioned such that at least one of the first touch sensor electrodes or the second touch sensor electrodes is spaced inward from the periphery of the display.

8. The touch sensor including a fingerprint sensor according to claim 1, wherein, The first touch sensor, composed of the first touch sensor electrode and the second virtual electrode, the second touch sensor, composed of the second touch sensor electrode and the first virtual electrode, and the fingerprint sensor have the same shape.

9. The touch sensor including a fingerprint sensor according to claim 1, wherein, The first touch sensor electrode and the first virtual electrode are arranged to cross each other.

10. The touch sensor including a fingerprint sensor according to claim 9, wherein, A single first fingerprint sensor electrode is arranged in place of at least one of the first virtual electrodes.

11. The touch sensor including a fingerprint sensor according to claim 1, wherein, The second touch sensor electrode and the second virtual electrode are arranged to cross each other.

12. The touch sensor including a fingerprint sensor according to claim 11, wherein, A single second fingerprint sensor electrode is arranged in place of at least one of the second virtual electrodes.

13. The touch sensor including a fingerprint sensor according to claim 1, wherein, The lower electrode layer includes a first wire that connects the first touch sensor electrodes, which are adjacent to each other, upwards from a third direction. The upper electrode layer includes a second wire connecting the second touch sensor electrodes adjacent to each other in a fourth direction that intersects with the third direction.

14. The touch sensor including a fingerprint sensor according to claim 1, further comprising: A base film is formed on the other side of the lower electrode layer; as well as A capping layer is formed on one side of the upper electrode layer.

Images