Touch display device including a fingerprint sensor

Abstract

The present invention relates to a touch display device including a fingerprint sensor. The present invention is provided to eliminate a brightness difference of a portion in which a touch sensor and a fingerprint sensor are applied to provide a display with uniform brightness in a touch display device in which a touch sensor and a fingerprint sensor are applied, characterized in that, by individually controlling the brightness of a portion in which the fingerprint sensor and the touch sensor are located, or changing the structure so that the light transmittance of the fingerprint sensor and the touch sensor is the same or similar, it is possible to enable the display to output uniform brightness.

Description

TECHNICAL FIELD

[0001] The present application relates to a touch display device including a fingerprint sensor. BACKGROUND

[0002] In recent years, there is a tendency for the screen of a mobile device to be large, and thus, there is a development trend of minimizing or removing physical buttons such as a home button. In accordance with the trend of removing such physical buttons, there is an accelerated development of buttons integrated with a display. In addition, in accordance with the trend of the appearance of buttons using fingerprints, there is a need to develop a fingerprint sensor integrated with a display.

[0003] A fingerprint sensor generally adopts a capacitive method, and can be roughly classified into a unit cell driving method and a matrix driving method. The unit cell driving method is configured of a plurality of unit cells individually driving a sensor for recognizing a fingerprint, can use various materials such as indium tin oxide or silicon, and has an advantage of low noise, but has a complex process and includes many layers, has a disadvantage of reduced transparency, and thus, is limited in application as a transparent electrode.

[0004] The matrix driving method is configured in a line-by-line shape by crossing an upper electrode extending along an x-axis and a lower electrode extending along a y-axis, and has a simple element structure, can be manufactured using only the upper electrode and the lower electrode, and thus, has an advantage of high transmittance, but has a disadvantage of high noise, and thus, requires high frequency driving of 10 kHz or more. Indium tin oxide widely used as a transparent electrode has a high resistance value, and thus, it is difficult to drive in a high frequency band of 10 kHz or more. In addition, indium tin oxide is difficult to apply to a stretchable display due to insufficient flexibility. Thus, a transparent electrode for a fingerprint sensor is required to have high transmittance and high conductivity.

[0005] A conventional transparent electrode for a fingerprint sensor has been disclosed in Korean Patent Laid-Open Publication No. 10-2018-0127259 ("Transparent electrode structure for fingerprint sensor and fingerprint sensor including the same", publication date November 28, 2018, 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 the prior art 1 is illustrated. Referring to Figure 1 , the existing transparent electrode structure 1 can include a first electrode 11, a dielectric layer 13, a second electrode 12, and a cover 14 stacked in one direction.

[0007] Figure 2 An upper plane of the transparent electrode structure 1 for a fingerprint sensor disclosed in the prior art 1 is illustrated. As Figure 2As shown, the first electrode 11 includes first conductive lines 21 extending in a first direction, and the second electrode 12 includes second conductive lines 22 extending in a second direction. The reason why the transparent electrode structure 1 for a fingerprint sensor is configured of the first electrode 11 and the second electrode 12 each including conductive lines extending in different directions as described above is to recognize a user's fingerprint using a capacitance difference of portions where the conductive lines cross each other, and thus the density of portions where the conductive lines cross each other is higher than that of a general touch sensor. As described above, since the density of a pattern included in the touch sensor is lower than that of the transparent electrode structure 1, it is generally configured only with an electrode composed of a single layer without being configured by crossing the first electrode 11 and the second electrode 12 as in the transparent electrode structure 1.

[0008] In order to apply the transparent electrode structure 1 for a fingerprint sensor shown in FIG. 1 to a display together with a general touch sensor, it is necessary to arrange the structure configuring the touch sensor and the transparent electrode structure 1 together, but since the touch sensor composed of a single layer and the transparent electrode structure 1 composed of two different electrodes overlapping each other have a difference in light transmission amount, there is a problem that a portion where the transparent electrode structure 1 is located becomes dark. Figure 1 and Figure 2 In order to apply the transparent electrode structure 1 for a fingerprint sensor shown in FIG. 1 to a display together with a general touch sensor, it is necessary to arrange the structure configuring the touch sensor and the transparent electrode structure 1 together, but since the touch sensor composed of a single layer and the transparent electrode structure 1 composed of two different electrodes overlapping each other have a difference in light transmission amount, there is a problem that a portion where the transparent electrode structure 1 is located becomes dark.

[0009] Prior Art Documents

[0010] Patent Documents

[0011] Korean Patent Laid-Open Publication No. 10-2018-0127259 ("Transparent electrode structure for fingerprint sensor and fingerprint sensor including the same", publication date: November 28, 2018) SUMMARY

[0012] (I) Technical Problem to be Solved

[0013] The present application has been made to solve the problems as described above, and the object of a touch display device including a fingerprint sensor according to the present application is to eliminate a luminance difference of a portion where a touch sensor and a fingerprint sensor are applied in a touch display applying the touch sensor and the fingerprint sensor at the same time, in order to provide a display device having uniform luminance.

[0014] (II) Technical Solution

[0015] A touch display device including a fingerprint sensor according to the present application for solving the problems as described above can include: a light emitting layer; a lower electrode layer formed on one side of the light emitting layer and including a plurality of first touch sensor electrodes and at least one first fingerprint sensor electrode arranged two-dimensionally; a dielectric layer formed on one face of the lower electrode layer; an upper electrode layer formed on one side of the dielectric layer and including a plurality of second touch sensor electrodes and at least one second fingerprint sensor electrode arranged two-dimensionally; and a control unit controlling a local luminance of the light emitting layer, the first fingerprint sensor electrode and the second fingerprint sensor electrode being arranged to face each other at the same position to constitute a fingerprint sensor, a light transmittance of the fingerprint sensor being less than that of the first touch sensor electrode and the second touch sensor electrode, the control unit being capable of controlling an output of the light emitting layer at each position or area on a display based on the light transmittance of the fingerprint sensor, the first touch sensor, and the second touch sensor.

[0016] In addition, the control unit can perform control such that the output of the light emitting layer of the fingerprint sensor area is greater than that of the light emitting layer of the first touch sensor area or the second touch sensor area for the same display request signal.

[0017] In addition, the first touch sensor electrode and the second touch sensor electrode can be arranged at different positions.

[0018] In addition, a width between two of the first touch sensor electrodes arranged adjacent to each other can be greater than or equal to a width of a single first touch sensor electrode, and a width between two of the second touch sensor electrodes arranged adjacent to each other can be greater than or equal to a width of a single second touch sensor electrode.

[0019] In addition, a part of the first touch sensor electrodes can be arranged between two of the second touch sensor electrodes arranged adjacent to each other, and a part of the second touch sensor electrodes can be arranged between two of the first touch sensor electrodes arranged adjacent to each other.

[0020] In addition, the touch display device can further include a storage unit which can store a light transmittance of each of the first touch sensor constituted by the first touch sensor electrode, the second touch sensor constituted by the second touch sensor electrode, and the fingerprint sensor, and the control unit can locally control the luminance of the light emitting layer using the light transmittance of each of the first touch sensor, the second touch sensor, and the fingerprint sensor stored in the storage unit.

[0021] In addition, the first touch sensor electrode and the first fingerprint sensor electrode can have the same light transmittance or be within a predetermined range.

[0022] In addition, the second touch sensor electrode and the second fingerprint sensor electrode can have the same light transmittance or be within a predetermined range.

[0023] In addition, the plurality of patterns in the first fingerprint sensor electrode can be spaced apart in a first direction, and the plurality of patterns in the second fingerprint sensor electrode can be spaced apart in a second direction intersecting the first direction at a predetermined angle.

[0024] In addition, a pitch between the patterns adjacent to each other can be 0.1 to 30 μm.

[0025] In addition, a width of a single pattern can be 0.1 to 100 μm.

[0026] In addition, the fingerprint sensor can be disposed at a periphery of the display.

[0027] In addition, the fingerprint sensor can be disposed inward from the periphery of the display by at least one of the first touch sensor electrode or the second touch sensor electrode.

[0028] In addition, the first touch sensor electrode, the second touch sensor electrode, and the fingerprint sensor can have the same shape.

[0029] In addition, the lower electrode layer can include first conductive lines connecting the first touch sensor electrodes adjacent to each other in a third direction, and the upper electrode layer can include second conductive lines connecting the second touch sensor electrodes adjacent to each other in a fourth direction.

[0030] In addition, the touch display device can further include a base film formed on the other face of the lower electrode layer, and a cover layer formed on the face of the upper electrode layer.

[0031] (III) Advantageous Effects

[0032] According to the touch display device including a fingerprint sensor according to the present application as described above, the control unit performs control to make the output of a portion of a surface of a light emitting layer to which a touch sensor is applied and the output of the remaining portion different, thereby enabling the display to uniformly output, to eliminate a luminance difference (a spot) that can occur in a display in which a fingerprint sensor and a touch sensor are simultaneously applied.

[0033] In addition, according to the present application, even if the control unit does not locally control the brightness of the light emitting layer, the light transmittance of the touch sensor and the fingerprint sensor can be made the same or similar within a predetermined range using a dummy electrode, thereby enabling the display to uniformly output, so as to eliminate a brightness difference (a spot) that can occur in a display in which a fingerprint sensor and a touch sensor are simultaneously applied. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a cross-sectional view of a transparent electrode structure for a fingerprint sensor disclosed in the prior art 1.

[0035] Figure 2 is a top plan view of a transparent electrode structure for a fingerprint sensor disclosed in the prior art 1.

[0036] Figure 3 is a partially exploded perspective view of a touch display device including a fingerprint sensor according to a first embodiment of the present application.

[0037] Figure 4 is an exploded perspective view of a sensing array of a touch display device including a fingerprint sensor according to the first embodiment of the present application.

[0038] Figure 5 is a top plan view of a base film and a lower electrode layer of a touch display device including a fingerprint sensor according to the first embodiment of the present application.

[0039] Figure 6 is a top plan view of a dielectric layer and an upper electrode layer of a touch display device including a fingerprint sensor according to the first embodiment of the present application.

[0040] Figure 7 is a top plan view of a touch display device including a fingerprint sensor according to the first embodiment of the present application, except for a cover layer.

[0041] Figure 8 is a top plan view of a base film and a lower electrode layer of a touch display device including a fingerprint sensor according to a second embodiment of the present application.

[0042] Figure 9 is a top plan view of a dielectric layer and an upper electrode layer of a touch display device including a fingerprint sensor according to the second embodiment of the present application.

[0043] REFERENCE NUMERALS

[0044] 1: Transparent electrode structure for a fingerprint sensor

[0045] 11: First electrode 12: Second electrode

[0046] 13: Dielectric layer 14: Cover

[0047] 100: light emitting layer 200: sensing array

[0048] 210: base film 220: lower electrode layer

[0049] 221: first touch sensor electrode 222: first fingerprint sensor electrode

[0050] 223: first wire 224: first dummy electrode

[0051] 230: dielectric layer 240: upper electrode layer

[0052] 241: second touch sensor electrode 242: second fingerprint sensor electrode

[0053] 243: second wire 244: second dummy electrode

[0054] 310: fingerprint sensor 321: first touch sensor

[0055] 322: second touch sensor R1: first candidate area

[0056] R2: second candidate area DETAILED DESCRIPTION

[0057] Hereinafter, preferred embodiments of a touch display device including a fingerprint sensor according to the present application will be described in detail with reference to the accompanying drawings.

[0058] [First Embodiment]

[0059] Figure 3 An exploded state of a touch display device including a fingerprint sensor according to the first embodiment of the present application is shown.

[0060] Figure 3 The components of the touch display device including a fingerprint sensor according to the first embodiment of the present application shown can not be manufactured in a manner of being exploded / assembled with each other as shown, Figure 3 Figure 3 are merely shown for the purpose of helping understanding.

[0061] As shown, Figure 3 the touch display device including a fingerprint sensor according to the first embodiment of the present application can include a light emitting layer 100 and a sensing array 200.

[0062] Figure 3 ​The light-emitting layer 100 shown is the portion that emits light for the output of the display device. The light-emitting layer 100 can use various types of light-emitting devices, and the light-emitting layer 100 can be a typical organic light-emitting diode (OLED).

[0063] The sensing array 200 is the portion of the touch display device including a fingerprint sensor according to a first embodiment of the present invention, which applies both a fingerprint sensor and a touch sensor. In various embodiments of the touch display device including a fingerprint sensor according to the present invention, the sensing array 200 may be located on one side of the light-emitting layer 100; in this embodiment, the sensing array 200 is located on one side of the light-emitting layer 100. The sensing array 200 may be formed from multiple layers.

[0064] Figure 4 This is an exploded view showing the layers that make up the sensing array 200.

[0065] like Figure 4 As shown, the sensing array 200 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.

[0066] like Figure 4 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.

[0067] Figure 4 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 both 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).

[0068] like Figure 4 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.

[0069] like Figure 4 As shown, the lower electrode layer 220 may include a first touch sensor electrode 221 and a first fingerprint sensor electrode 222, which will be described later. The lower electrode layer 220 as a whole may have a certain level of light transmittance.

[0070] like Figure 4As 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.

[0071] like Figure 4 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 4 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 and a second fingerprint sensor electrode 242, which will be described later. Additionally, the upper electrode layer 240 may have a certain level of light transmittance.

[0072] like Figure 4 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.

[0073] Figure 5 The image shows the integrated base film 210 and lower electrode layer 220 as viewed from above.

[0074] like Figure 5 As shown, the first touch sensor electrode 221 included in the lower electrode layer 220 is formed for sensing user touches in the touch display 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.

[0075] In this invention, at least one first fingerprint sensor electrode 222 may be formed on the surface of the base film 210. Figure 5In the present embodiment, four first fingerprint sensor electrodes 222 are formed on the surface of the base film 210. The first fingerprint sensor electrodes 222 can be arranged on the periphery of the first touch sensor electrodes 221 formed 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, a wire connecting the first fingerprint sensor electrodes 222 to the outside needs to be formed, and thus it is advantageous to form the first fingerprint sensor electrodes 222 on the periphery of the first touch sensor electrodes 221. However, the position of the first fingerprint sensor electrodes 222 according to the present embodiment is not limited to being on the periphery of the base film 210 as shown in Figure 5 but can be arranged at a position spaced inward from the periphery of the base film 210 by at least one first touch sensor electrode 221 as shown in Figure 5

[0076] As shown in Figure 5 the plurality of patterns P in the single first fingerprint sensor electrode 222 are formed spaced apart from each other in parallel. In this case, the pitch between two patterns P arranged adjacent to each other among the plurality of patterns P constituting the single first fingerprint sensor electrode 222 can be 0.1 to 30 μm, and the width of the single pattern P can be 0.1 to 100 μm. The fine width of the pattern and the fine pitch between the patterns can be a criterion for distinguishing between the touch sensor electrodes and the fingerprint sensor electrodes. As described above, the distinction between the touch sensor electrodes and the fingerprint sensor electrodes is that the purpose of the touch sensor and the fingerprint sensor constituted by each electrode is different.

[0077] Figure 5 The plurality of patterns P constituting the first fingerprint sensor electrode 222 are formed extending in a left upper diagonal direction as a reference, and are formed spaced apart in a direction perpendicular to the direction, which is referred to as a first direction. The direction in which the second fingerprint sensor electrode to be described later is formed extending is referred to as a second direction. Figure 5

[0078] As shown in Figure 5 the plurality of first touch sensor electrodes 221 arranged two-dimensionally are connected to each other by the first wires 223 formed extending in a vertical direction. The vertical direction is a third direction, and the plurality of first touch sensor electrodes 221 are electrically connected to each other by the first wires 223, so that a row can be formed.

[0079] As shown in Figure 5 ​​The first candidate region R1 is provided in a space between the first touch sensor electrodes 221 adjacent to each other, or in a space adjacent to the first touch sensor electrodes 221. The first candidate region R1 is a portion facing the second touch sensor electrodes 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.

[0080] Figure 6 The state in which the dielectric layer 230 and the upper electrode layer 240 are integrated with each other is shown as viewed from above. Like the first touch sensor electrodes 221 described above, the plurality of second touch sensor electrodes 241 included in the upper electrode layer 240 are arranged at predetermined intervals, and the width between the adjacent second touch sensor electrodes 241 is 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 by the second conductive lines 243, so that the second touch sensor electrodes electrically connected to each other can form a row. The horizontal direction formed by the second conductive lines 243 is referred to as a fourth direction. The third direction and the fourth direction can intersect at a predetermined angle with each other.

[0081] The second candidate region R2 is also provided between the second touch sensor electrodes 241 adjacent to each other. The second candidate region R2 is a portion facing the first touch sensor electrodes 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. That is, in the touch display of various embodiments of the present application, the first touch sensor electrodes 221 and the second touch sensor electrodes 241 are provided at different positions with reference to the direction in which each layer is stacked.

[0082] 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.

[0083] Figure 7 Showing the view from above Figure 5 and Figure 6 The base film 210, lower electrode layer 220, dielectric layer 230 and upper electrode layer 240 shown are integrated into one unit.

[0084] like Figure 7 As shown, the first fingerprint sensor electrode 222 and the second fingerprint sensor electrode 242 overlap at the same location to face each other to form a fingerprint sensor 310. The first touch sensor electrode 221 forms the first touch sensor 321, and the second touch sensor electrode 241 forms the second touch sensor 322. However, as described in the background art, in the fingerprint sensor 310, the first fingerprint sensor electrode 222 and the second fingerprint sensor electrode 242 overlap, therefore, the light transmittance of the fingerprint sensor 310 may be less than the light transmittance of each of the first touch sensors 321 and the second touch sensors 322. Therefore, the control unit that controls the local brightness of the light-emitting layer 100 performs control so that the brightness of the portion of the light-emitting layer where the fingerprint sensor 310 is located, based on the stacking direction of the light-emitting layer and the sensing array, is brighter than the remaining portion where the first touch sensors 321 and the second touch sensors 322 are located, thereby making the display output more uniform by compensating for the speckles of the display caused by the application of the fingerprint sensor 310. (Refer to...) Figure 3The control unit can perform control to make the brightness of a separate control area S in which the first touch sensor 321 is located brighter than the rest of the surface of the light emitting layer 100, and can perform control to make the output of the light emitting layer greater than the output of the light emitting layer of an area in which the first touch sensor 321 or the second touch sensor 322 is provided for the same display request signal.

[0085] The present application can further include a storage unit (not shown). The storage unit can be hardware such as a memory. The transmittance of each of the first touch sensor 321, the second touch sensor 322, and the fingerprint sensor 310 can be stored in the storage unit. The control unit can locally control the brightness of the light emitting layer using the transmittance information stored in the storage unit, and thus can uniformly control the overall brightness of the display.

[0086] In the touch display according to various embodiments of the present application, the transmittance of each of the first touch sensor electrode 221, the second touch sensor electrode 241, the first fingerprint sensor electrode 222, and the second fingerprint sensor electrode 242 can be the same, or similar within a predetermined range. In addition, the size and shape of the space occupied by each of the first touch sensor electrode 221, the second touch sensor electrode 241, the first fingerprint sensor electrode 222, and the second fingerprint sensor electrode 242 can be the same.

[0087] The lower electrode layer 220 and the upper electrode layer 240 of the present application can be patterned by various methods after forming a layer using a transparent electrode material on one side of the base film 210 and the dielectric layer 230, respectively, to form the electrodes included in each of the electrode layers. At this time, the transparent electrode material can include at least one of a metal nanowire, a metal nanofiber, a metal mesh, and a metal oxide, and in particular, the transparent electrode material must include at least one of a metal nanowire and a metal nanofiber. The method of forming a layer using a transparent electrode material includes vacuum deposition, spraying, spin coating, and deposition printing, and the method of forming the electrodes included in each of the electrode layers includes a photoresist (PR) process, laser patterning, electron beam (E-beam) patterning, and transfer printing. However, the method of forming the lower electrode layer 220 and the upper electrode layer 240 of the present application is not limited to the above-described methods, and the lower electrode layer 220 and the upper electrode layer 240 can be formed on one side of the base film 210 and the dielectric layer 230, respectively, by other methods in addition to the above-described methods.

[0088] [Second Embodiment]

[0089] Hereinafter, a touch display according to a second embodiment of the present application will be described in detail with reference to the accompanying drawings.

[0090] As described above, the control unit of the touch display according to the first embodiment of the present invention achieves uniform brightness of the display by adjusting the local brightness of the light-emitting layer, while the touch display according to the second embodiment of the present invention achieves uniform brightness of the display by changing its structure. The touch display according to the second embodiment of the present invention may include only a base film, a lower electrode layer, a dielectric layer, and an upper electrode layer. The base film and dielectric layer included in the touch display according to the second embodiment of the present invention have the same structure as those included in the touch display according to the first embodiment of the present invention, therefore, detailed descriptions thereof are omitted.

[0091] Figure 8 The image shows the state of the base film 210 and the lower electrode layer 220 integrated with each other in a touch display according to the second embodiment of the present invention, viewed from above.

[0092] like Figure 8 As shown, in this embodiment, the lower electrode layer 220 includes a first touch sensor electrode 221, a first fingerprint sensor electrode 222, a first wire 223, and a first virtual electrode 224. The first touch sensor electrode 221, the first fingerprint sensor electrode 222, and the first wire 223 have the same structure as in the first embodiment described above, so their description is omitted.

[0093] like Figure 8 As shown, the first virtual electrode 224 is arranged in the space between adjacent first touch sensor electrodes 221. The structure of the first virtual electrode 224 is the same as that of the first touch sensor electrodes 221, but it is not electrically connected by the first wire 223. That is, the first virtual electrode 224 is not used as a touch sensor, and it is located in the first candidate area mentioned in the first embodiment above.

[0094] Figure 9 The image shows the state of the dielectric layer 230 and the upper electrode layer 240 integrated with each other in a touch display according to the second embodiment of the present invention, viewed from above.

[0095] like Figure 9 As shown, in this embodiment, the upper electrode layer 240 includes a second touch sensor electrode 241, a second fingerprint sensor electrode 242, a second wire 243, and a second virtual electrode 244. The second touch sensor electrode 241, the second fingerprint sensor electrode 242, and the second wire 243 have the same structure as in the first embodiment, so their description is omitted.

[0096] like Figure 9As shown, the second dummy electrode 244 is arranged in spaces between the second touch sensor electrodes 241 adjacent to each other. The structure of the second dummy electrode 244 is the same as that of the second touch sensor electrode 241, but is not electrically connected with the second conductive wire 243, so that the first dummy electrode 224 does not function as a touch sensor, which is disposed in the second candidate area mentioned in the above first embodiment. Thus, the first dummy electrode 224 is located at the same position as the second touch sensor electrode 241 to face each other, and the second dummy electrode 244 is located at the same position as the first touch sensor electrode 221 to face each other. The first dummy electrode 224 can have the same light transmittance as the first touch sensor electrode 221 and the first fingerprint sensor electrode 222 included in the same layer, and the second dummy electrode 244 can have the same light transmittance as the second touch sensor electrode 241 and the second fingerprint sensor electrode 242 included in the same layer, and by such a configuration, the first touch sensor constituted by the first touch sensor electrode 221 and the second dummy electrode 244 overlapping each other, the second touch sensor constituted by the second touch sensor electrode 241 and the first dummy electrode 224 overlapping each other, and the fingerprint sensor all have the same or similar light transmittance within a predetermined range, so that the light from the light emitting layer located on the other side of the base film 210 is reduced and transmitted to the one side of the upper electrode layer 240 to the same or similar degree, thereby making it possible to make the output of the display uniform without a separate control.

[0097] The technical idea of the present application should not be construed as being limited to the above-described embodiments. The present application has a wide range of applications, and those skilled in the art can implement various modifications without departing from the spirit of the present application protected in the claims. Therefore, as long as such modifications and changes are obvious to those skilled in the art, they belong to the scope of protection of the present application.

Claims

1. A touch display device, characterized by comprising: comprises: a light emitting layer; a lower electrode layer formed on one side of the light emitting layer and including a plurality of first touch sensor electrodes, a first dummy electrode, and at least one first fingerprint sensor electrode arranged two-dimensionally; an upper electrode layer formed on one side of the lower electrode layer and including a plurality of second touch sensor electrodes, a second dummy electrode, and at least one second fingerprint sensor electrode arranged two-dimensionally; and a control unit that controls a local luminance of the light emitting layer, the first fingerprint sensor electrode and the second fingerprint sensor electrode are arranged to face each other at the same position to constitute a fingerprint sensor, the control unit controls an output of the light emitting layer at each position or area on a display based on a light transmittance of the fingerprint sensor, a first touch sensor, and a second touch sensor, wherein the first dummy electrode is located at the same position as the second touch sensor electrode to face each other, the second dummy electrode is located at the same position as the first touch sensor electrode to face each other, the first dummy electrode has the same light transmittance as the first touch sensor electrode and the first fingerprint sensor electrode included in the same layer, and the second dummy electrode has the same light transmittance as the second touch sensor electrode and the second fingerprint sensor electrode included in the same layer. 2.The touch display device of claim 1, wherein the control unit performs control such that an output of the light emitting layer of the fingerprint sensor area is greater than an output of the light emitting layer of the first touch sensor area or the second touch sensor area for the same display request signal. 3.The touch display device of claim 1, wherein the first touch sensor electrode and the second touch sensor electrode are arranged at different positions. 4.The touch display device of claim 3, wherein a width between two of the first touch sensor electrodes arranged adjacent to each other is greater than or equal to a width of a single one of the first touch sensor electrodes, a width between two of the second touch sensor electrodes arranged adjacent to each other is greater than or equal to a width of a single one of the second touch sensor electrodes. 5.The touch display device of claim 4, wherein a portion of the first touch sensor electrodes are arranged between two of the second touch sensor electrodes arranged adjacent to each other, a portion of the second touch sensor electrodes are arranged between two of the first touch sensor electrodes arranged adjacent to each other. 6.The touch display device of claim 1, further comprising: a storage unit that stores a light transmittance of each of the first touch sensor constituted by the first touch sensor electrode, the second touch sensor constituted by the second touch sensor electrode, and the fingerprint sensor, the control unit locally controls the luminance of the light emitting layer using the light transmittance of each of the first touch sensor, the second touch sensor, and the fingerprint sensor stored in the storage unit. 7.The touch display device of claim 1, wherein ​ The first touch sensor electrode and the first fingerprint sensor electrode have the same light transmittance or a light transmittance within a predetermined range. 8.The touch display device of claim 1, wherein, The second touch sensor electrode and the second fingerprint sensor electrode have the same light transmittance or a light transmittance within a predetermined range. 9.The touch display device of claim 1, wherein, The plurality of patterns in the first fingerprint sensor electrode are spaced apart in a first direction, The plurality of patterns in the second fingerprint sensor electrode are spaced apart in a second direction crossing the first direction at a predetermined angle. 10.The touch display device of claim 9, wherein, The pitch between the patterns adjacent to each other is 0.1 to 30 μm. 11.The touch display device of claim 9, wherein, The width of the single pattern is 0.1 to 100 μm. 12.The touch display device of claim 1, wherein, The fingerprint sensor is disposed at a periphery of the display. 13.The touch display device of claim 1, wherein, The fingerprint sensor is disposed inward from the periphery of the display by at least one of the first touch sensor electrode or the second touch sensor electrode. 14.The touch display device of claim 1, wherein, The first touch sensor electrode, the second touch sensor electrode, and the fingerprint sensor have the same shape. 15.The touch display device of claim 1, wherein, The lower electrode layer includes first conductive lines connecting the first touch sensor electrodes adjacent to each other in a third direction, The upper electrode layer includes second conductive lines connecting the second touch sensor electrodes adjacent to each other in a fourth direction. 16.The touch display device of claim 1, further comprising: a base film formed on the other face of the lower electrode layer; and a cover layer formed on the face of the upper electrode layer. ​

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