WO2015182875A1

WO2015182875A1 - Touch panel and display device

Info

Publication number: WO2015182875A1
Application number: PCT/KR2015/003897
Authority: WO
Inventors: 이기성; 김기환; 김광현; 안균; 강준식
Original assignee: 일진디스플레이(주)
Priority date: 2014-05-29
Filing date: 2015-04-17
Publication date: 2015-12-03
Also published as: KR20150138472A; KR101577199B1

Abstract

A touch panel according to an embodiment comprises: a sensing electrode formed on a substrate; a wire electrode formed on at least one end of the sensing electrode; and an auxiliary electrode formed on the wire electrode, wherein the first region of the auxiliary electrode is in contact with the sensing electrode and the second region of the auxiliary electrode is in contact with the wire electrode.

Description

Touch Panel and Display

An embodiment relates to a touch panel.

An embodiment relates to a display device.

Recently, various electronic products have been applied to a touch panel for inputting by touching an input device such as a finger or a stylus to an image displayed on a display device.

The touch panel may be largely classified into a resistive touch panel and a capacitive touch panel. In the resistive touch panel, the glass and the electrode are short-circuited by the pressure of the input device to detect the position. The capacitive touch panel detects a change in capacitance between electrodes when a finger touches and detects a position thereof.

The resistive touch panel may be degraded due to repeated use, and scratches may occur. Accordingly, interest in capacitive touch panels with excellent durability and long lifespan is increasing.

The capacitive touch panel is defined as an effective area capable of inputting a touch command and an invalid area outside the effective area. The sensing electrode formed in the effective region is formed of a transparent conductive material, and the wiring electrode formed in the ineffective region is formed of an opaque metal material.

Conventionally, the sensing electrode is formed of indium tin oxide (ITO). The indium tin oxide has a high sheet resistance, a high material cost, and an instability of indium supply and demand in the raw material market, and has a problem that cannot be used in a flexible display device which is a recent trend.

Recently, research has been made on transparent electrode materials such as nanowires replacing indium-tin oxides.

When the sensing electrode is formed of nanowires, a problem of electrical contact between the sensing electrode and the wiring electrode occurs. That is, the contact area between the nanowires and the wiring electrode formed of the metal material is small, so that the contact resistance is high, and an electrical shock is generated between the sensing electrode and the wiring electrode due to an external impact, thereby causing a defect.

The embodiment provides a touch panel that prevents signal distortion during touch detection.

The embodiment provides a display device for improving reliability against external shocks.

Touch panel according to the embodiment, the sensing electrode formed on the substrate; A wiring electrode formed on at least one end of the sensing electrode; And an auxiliary electrode formed on the wiring electrode, wherein the first region of the auxiliary electrode contacts the sensing electrode, and the second region of the auxiliary electrode contacts the wiring electrode.

The touch panel according to the embodiment forms an auxiliary electrode having different particles from the wiring electrode to reduce the resistance between the sensing electrode and the wiring electrode to prevent signal distortion when exchanging signals between the sensing electrode and the wiring electrode.

In the display device according to the embodiment, an auxiliary electrode is formed in the contact region of the wiring electrode and the sensing electrode to enhance the bonding force in the contact region, thereby preventing the detachment of the wiring electrode during external shock, thereby reducing the defective rate.

1 is an exploded perspective view of a touch panel according to a first embodiment.

2 is a top view of the touch panel according to the first embodiment.

3 is an enlarged view of the contact area of FIG. 2.

4 is a cross-sectional view taken along the line BB ′ of FIG. 3.

5 is an enlarged view of a contact area of a touch panel according to a second embodiment.

FIG. 6 is a cross-sectional view taken along the line CC ′ of FIG. 7.

7 is a perspective view of a display device to which the touch panels according to the first and second embodiments are applied.

Hereinafter, with reference to the drawings will be described in detail a specific embodiment of the present invention. However, the spirit of the present invention is not limited to the embodiments presented, and those skilled in the art who understand the spirit of the present invention may deteriorate other inventions or the present invention by adding, modifying, or deleting other elements within the scope of the same idea. Other embodiments that fall within the scope of the inventive concept may be readily proposed, but they will also be included within the scope of the inventive concept.

In addition, the components with the same functions within the scope of the same idea shown in the drawings of each embodiment will be described using the same reference numerals.

Referring to FIG. 1, the touch panel 1 according to the first embodiment may include a cover substrate 10, a first substrate 20, a second substrate 30, and a printed circuit board 40.

The second substrate 30 is located under the cover substrate 10, and the first substrate 20 is located under the second substrate 30.

The cover substrate 10 may be attached to the second substrate 30. The cover substrate 10 and the second substrate 30 may be bonded using an adhesive material such as an optical clear adhesive (OCA).

The first substrate 20 may be attached to the second substrate 30. The first substrate 20 may be bonded to the second substrate 30 using an adhesive material such as an optical clear adhesive (OCA).

The cover substrate 10 may include glass or plastic. The cover substrate 10 may include tempered glass, semi-tempered glass, soda-lime glass, tempered plastic or soft plastic.

The first substrate 20 and the second substrate 30 may include plastic such as polyethylene terephthalate (PET).

A sensing electrode and a wiring electrode may be formed on the first substrate 20 and the second substrate 30.

The first sensing electrode 21 and the first wiring electrode 23 may be formed on the first substrate 20, and the second sensing electrode 31 and the second wiring electrode () may be formed on the second substrate 30. 33) can be formed.

The first sensing electrode 21 may be formed in a first direction. The first sensing electrode 21 may be electrically connected to the first wiring electrode 23.

The second sensing electrode 31 may be formed in a second direction. The second direction may be a direction crossing the first direction. The second sensing electrode 31 may be formed in a direction crossing the first sensing electrode 21. The second sensing electrode 31 may be electrically connected to the second wiring electrode 33.

The printed circuit board 40 may be attached to the first substrate 20 and the second substrate 30. The printed circuit board 40 may be attached to one side of the first substrate 20 and the second substrate 30. The printed circuit board 40 may be attached to one side of the first substrate 20 and the second substrate 30 to be electrically connected to the first wiring electrode 23 and the second wiring electrode 33. An anisotropic conductive film (ACF) may be applied to one side of the first substrate 20 and the second substrate 30 attached to the printed circuit board 40. The printed circuit board 40 may apply a voltage to the first wiring electrode 23 and the second wiring electrode 33 by the anisotropic conductive film.

Grooves 41 may be formed in the printed circuit board 40. The groove 41 may be formed in the printed circuit board 40 so that the printed circuit board 40 may be attached to the first substrate 20 and the second substrate 30 without any gap. The printed circuit board 40 may be deformed by the groove part 41 so as to correspond to a step due to the stacking of the first substrate 20 and the second substrate 30. The adhesion between the first substrate 20 and the second substrate 30 can be prevented.

The printed circuit board 40 may be a flexible printed circuit board (FPCB) that can be flexed well. The printed circuit board 40 may be provided with a controller for receiving and controlling a sensing signal from the first and

second sensing electrodes

21 and 31 through the first and

second wiring electrodes

23 and 33. have.

2 is a top view of the touch panel according to the first embodiment.

2, the touch panel according to the first embodiment may include an effective area AA and an invalid area UA.

The effective area AA refers to an area in which a user's touch command can be input, and the invalid area UA is not activated even when a user's touch located outside the effective area AA is activated. This means an area that is not made.

When the touch panel is attached to the display panel and used, the effective area AA and the invalid area UA of the touch panel may correspond to the display area and the non-display area of the display device. The display area is an area for displaying an image and the non-display area is an area for not displaying an image. Therefore, the effective area AA of the touch panel should be configured as an area that can transmit light, and the invalid area UA of the touch panel can be configured as an area that does not transmit light.

A plurality of sensing electrodes may be formed in the effective area AA. A plurality of first sensing electrodes 21 may be formed in the effective area AA of the first substrate 20, and a plurality of second sensing electrodes may be formed in the effective area AA of the second substrate 30. 31) can be formed.

A plurality of wiring electrodes may be formed in the ineffective region UA. A plurality of first wiring electrodes 23 may be formed in the non-effective region UA of the first substrate 20, and a plurality of second wirings may be formed in the non-effective region UA of the second substrate 30. The electrode 33 can be formed.

The first sensing electrode 21 may be electrically connected to the first wiring electrode 23. The first sensing electrode 21 may be formed integrally with the first wiring electrode 23, and the first sensing electrode 21 may be formed separately from the first wiring electrode 23.

The second sensing electrode 31 may be electrically connected to the second wiring electrode 33. The second sensing electrode 31 may be integrally formed with the second wiring electrode 33, and the second sensing electrode 31 may be formed separately from the second wiring electrode 33.

The first and

second sensing electrodes

21 and 31 and the first and

second wiring electrodes

23 and 33 may include a conductive material. The first and

second sensing electrodes

21 and 31 may be formed of a transparent conductive material.

The first and

second sensing electrodes

21 and 31 and the first and

second wiring electrodes

23 and 33 may be formed of indium tin oxide (ITO), copper oxide, and carbon nano tube (CNT). ), And may include at least one conductive material selected from the group consisting of nano wires, conductive polymers, and graphene. In addition, the first and

second sensing electrodes

21 and 31 may include at least one conductive material selected from the group consisting of silver nanowires and carbon nanowires. In addition, the first wiring electrode 23 and the second wiring electrode 33 may include a metal material such as copper (Cu) and silver (Ag).

In the first embodiment, for example, the first and

second sensing electrodes

21 and 31 include nanowires, and the first and

second wiring electrodes

23 and 33 include silver (Ag). Explain. Since the first and

second wiring electrodes

23 and 33 include silver, the first and

second wiring electrodes

23 and 33 do not transmit light.

Since the first and

second sensing electrodes

21 and 31 are formed of the same material, the first sensing electrode 21 will be described as an example.

The first sensing electrode 21 may include a nanowire 21a and a matrix 21b.

The nanowires 21a refer to nanoscale structures having electrical conductivity, and the width of the at least one nanowire 21a may be less than 30 nm.

The nanowires 21a are formed of a metallic material including an elemental metal (eg transition metals) or a metal compound (eg metal oxide). The metal material may also be a bimetallic material or metal alloy comprising two or more types of metals. The metal may include silver, gold, copper, nickel, gold-plated silver, platinum and palladium.

The nanowires 21a using the silver as the conductive material may be defined as silver nanowires. The silver nanowire may be a silver salt [eg, in the presence of polyols (eg ethylene glycol) and poly (vinyl pyrrolidone). Silver nitrate] may be synthesized through solution-phase reduction.

The matrix 21b constitutes a main body of the first sensing electrode 21 and refers to a solid state material in which the nanowires 21a are dispersed or embedded therein. A portion of the nanowire 21a may protrude from the matrix 21b.

The matrix 21b prevents the nanowires 21a from being corroded and worn out. The matrix 21b may provide an adhesive force to the first substrate 20.

The matrix 21b may be a polymer. The matrix 21b is made up of polymethacrylates, polyacrylates and polyacrylonitriles, polyvinyl alcohols, polyesters, polyesters Polyester naphthalate, polycarbonates, polymers with high degree of aromaticity, cellulosics, silicones, other silicon-containing polymers containing polymers, polyvinylchloride (PVC), polyacetates, polynorbornene, synthetic rubbers, and fluoropolymers, but It is not limited to.

A first pad 27 may be formed at one side of the first wiring electrode 23. The first wiring electrode 23 may electrically connect the first pad 27 and the first sensing electrode 21.

A second pad 37 may be formed on one side of the second wiring electrode 33. The second wiring electrode 33 may electrically connect the second pad 37 and the second sensing electrode 31.

The first and

second pads

27 and 37 may be electrically connected to the printed circuit board 40 to exchange signals with the printed circuit board 40. The first and

second pads

27 and 37 may have a wider width than the first wiring electrode 23 and the second wiring electrode 33 for connection with the printed circuit board 40.

The first and

second pads

27 and 37 may be formed of the same material as the first and

second wiring electrodes

23 and 33 or may be formed of different materials. The first and

second pads

27 and 37 may include a metal material such as silver (Ag). The first pad 27 may be coated on the first wiring electrode 23, and the second pad 37 may be formed on the second wiring electrode 33.

3 is an enlarged view of the contact region of FIG. 2, and FIG. 4 is a cross-sectional view taken along the line B-B ′ of FIG. 3.

3 and 4, an area in which the first sensing electrode 21 and the first wiring electrode 23 come into contact with the ineffective area UA of the first substrate 20 according to the first embodiment. This exists.

An area where the first sensing electrode 21 and the first wiring electrode 23 meet may be defined as a contact area 25. Since the first wiring electrode 23 includes silver that does not transmit light, the contact region 25 may be formed in the ineffective region UA.

The area of the first sensing electrode 21 is widened in the contact region 25. In the contact region 25, the width of the first sensing electrode 21 may be widened, thereby increasing the area of the first sensing electrode 21. The width of the first sensing electrode 21 may extend in the second direction in the contact region. The width of the first sensing electrode 21 may extend in a direction perpendicular to the arrangement direction of the first sensing electrode 21 in the contact region.

An auxiliary electrode 51 may be formed on at least a portion of the first sensing electrode 21. The auxiliary electrode 51 may be formed on at least one end of the first sensing electrode 21. The auxiliary electrode 51 may be formed at both ends of the first sensing electrode 21. The auxiliary electrode 51 may be formed on the first sensing electrode 21 in the contact region 25.

The first wiring electrode 23 may be formed on at least a portion of the first sensing electrode 21. The first wiring electrode 23 may be formed on at least one end of the first sensing electrode 21. The first wiring electrode 23 may be formed at both ends of the first sensing electrode 21. The first wiring electrode 23 may be formed on the first sensing electrode 21 in the contact region 25.

The first wiring electrode 23 may be formed on the auxiliary electrode 51. An end of the first wiring electrode 23 may be formed to coincide with an end of the auxiliary electrode 51. The first wiring electrode 23 may extend to the first region. The first wiring electrode 23 may extend in a direction opposite to the effective area AA.

An area of the first wiring electrode 23 formed on the auxiliary electrode 51 may be the same as that of the auxiliary electrode 51. The first wiring electrode 23 formed on the auxiliary electrode 51 may be larger than the width of the first wiring electrode 23 formed on the first substrate 20.

The first wiring electrode 23 and the auxiliary electrode 51 may be formed of the same material, and the first wiring electrode 23 and the auxiliary electrode 51 may be formed of different materials.

Even when the first wiring electrode 23 and the auxiliary electrode 51 are formed of the same material, particle sizes of the first wiring electrode 23 and the auxiliary electrode 51 may be different. The particle size of the auxiliary electrode 51 may be smaller than the particle size of the first wiring electrode 23.

The auxiliary electrode 51 and the first wiring electrode 23 may have different shapes of particles.

Hereinafter, a case in which the first wiring electrode 23 and the auxiliary electrode 51 include silver (Ag) material will be described.

When the first wiring electrode 23 and the auxiliary electrode 51 include a silver material, the particle size of the first wiring electrode 23 may be 1 μm to 2 μm. The particle size of the auxiliary electrode 51 may be 0.2 μm to 1 μm.

The particle size of the auxiliary electrode 51 is smaller than the particle size of the first wiring electrode 23 so that the first wiring electrode 23 is formed on the first sensing electrode 21. The electrical contact can be improved in relation to the first sensing electrode 21.

Since the first sensing electrode 21 includes the nanowire 21a, when the first wiring electrode 23 having a relatively large particle size is formed on the first sensing electrode 21, the nano The contact point between the wire 21a and the particles of the first wiring electrode 23 is reduced, thereby increasing the contact resistance between the first sensing electrode 21 and the first wiring electrode 23. In addition, the contact point between the nanowires 21a and the particles of the first wiring electrode 23 is reduced, so that the first sensing electrode 21 and the first wiring electrode 23 are electrically opened due to an external impact, thereby causing a defect. This can happen.

When the auxiliary electrode 51 is formed between the first sensing electrode 21 and the first wiring electrode 23, the auxiliary electrode 51 has a smaller particle size than the first wiring electrode 23. Therefore, when the auxiliary electrode 51 is formed on the first sensing electrode 21, the contact point between the nanowires 21a of the sensing electrode 21 and the particles of the auxiliary electrode 51 increases, thereby. Accordingly, the contact resistance between the first sensing electrode 21 and the auxiliary electrode 51 decreases.

In addition, since the change of the contact resistance value by the contact point between the first wiring electrode 23 and the auxiliary electrode 51 having a relatively small particle size difference is insignificant, the first sensing electrode 21 and the first electrode are changed. Contact resistance is reduced by forming the auxiliary electrode 51 between the wiring electrodes 23 so that signal distortion due to RC delay may occur during signal exchange between the first sensing electrode 21 and the first wiring electrode 23. Can be prevented.

In addition, the contact point between the nanowire 21a of the first sensing electrode 21 and the auxiliary electrode 51 increases, so that the first sensing electrode 21 and the auxiliary electrode 51 are electrically connected by an external shock. It can prevent the opening to reduce the defective rate.

The particles of the first wiring electrode 23 may have a spherical shape, and the particles of the auxiliary electrode 51 may include a rod shape having directivity. The particle shape of the auxiliary electrode 51 may have a spherical shape and a flake shape.

Since the auxiliary electrode 51 includes the flake particles, the contact resistance between the first sensing electrode 21 and the auxiliary electrode 51 may be reduced. Since the auxiliary electrode 51 is formed in the flake shape, the contact point of the first sensing electrode 21 with the nanowire 21a is increased to increase the contact resistance between the first sensing electrode 21 and the auxiliary electrode 51. Decreases.

The contact resistance between the first sensing electrode 21 and the first auxiliary electrode 51 is defined as a first resistance, and the contact resistance between the first sensing electrode 21 and the first wiring electrode 23 is defined. 2 can be defined as resistance.

The first resistor and the second resistor may have different values from each other. The first resistor may have a smaller value than the second resistor. That is, the contact resistance value between the first sensing electrode 21 and the first auxiliary electrode 51 may be smaller than the contact resistance value between the first sensing electrode 21 and the first wiring electrode 23. .

The auxiliary electrode 51 having a smaller contact resistance value in relation to the first sensing electrode 21 is formed between the first sensing electrode 21 and the first wiring electrode 23, thereby forming the first electrode. The resistance between the first sensing electrode 21 and the first wiring electrode 23 can be reduced.

Table 1 shows a case in which the first wiring electrode 23 is directly formed on the first sensing electrode 21 without the auxiliary electrode 51 and the first wiring electrode 23 and the first sensing electrode 21. Is a table showing the contact resistance and the presence or absence of defects in the case where the auxiliary electrode 51 is formed therebetween.

Table 1

	Auxiliary electrode	First wiring electrode	Remarks
Contact resistance (Ω)	500	645	22.5% reduction
Poor (reliability check)	Good	Bad after 120 hours

Referring to Table 1, the contact resistance value when the auxiliary electrode 51 is formed on the first sensing electrode 21 is 500Ω. That is, the first resistor is 500 Ω.

The contact resistance value when the first wiring electrode 23 is directly formed on the first sensing electrode 21 is 645Ω. That is, the second resistor is 645 Ω.

Since the auxiliary electrode 51 and the first wiring electrode 23 are made of the same material, the contact resistance between the auxiliary electrode 51 and the first wiring electrode 23 can be referred to as zero, so that the auxiliary electrode Since 51 is formed on the first sensing electrode 21 and the first wiring electrode 23, the contact resistance is reduced by 22.5%. The RC delay is reduced by the effect of reducing the contact resistance between the first sensing electrode 21 and the first wiring electrode 23, and thus, between the first sensing electrode 21 and the first wiring electrode 23. There is an effect that can prevent the distortion of the signal exchanged in the.

In addition, when the first wiring electrode 23 is directly formed on the first sensing electrode 21 without the auxiliary electrode 51 and the first wiring electrode 23 and the first sensing electrode 21. In the case where the auxiliary electrode 51 was formed therebetween, the defect inspection was performed under the condition of high temperature (85 ° C.) and high humidity (85%). After 120 hours, the failure occurred when the auxiliary electrode 51 was not present. . The touch panel in which the auxiliary electrode 51 and the first wiring electrode 23 were formed on the first sensing electrode 21 under the same condition did not generate a defect.

In the result of Table 1, when the auxiliary electrode 51 is formed between the first sensing electrode 21 and the first wiring electrode 23, it can be confirmed that no defect occurs.

The first wiring electrode 23 and the auxiliary electrode 51 may be formed of different materials. The first wiring electrode 23 may include a silver material, and the auxiliary electrode 51 may be formed of gold (Au), nickel (Ni), platinum (Pt), carbon series, polyaniline, or a combination thereof. Can be.

The carbon series may be a carbon paste, a carbon nano tube, a carbon nano fiber, or graphene.

Hereinafter, a case in which the first wiring electrode 23 includes a silver material and the auxiliary electrode 51 is formed of carbon paste will be described.

The particle size of the first wiring electrode 23 may be 1 μm to 2 μm. The particle size of the auxiliary electrode 51 may be 0.4 μm.

Since the particle size of the auxiliary electrode 51 is smaller than the particle size of the first wiring electrode 23, the above-described auxiliary electrode 51 includes a silver material having a particle size of 0.2 μm to 1 μm. It can have the same effect as

In addition, when the auxiliary electrode 51 is formed of the viscous carbon paste, the adhesion force with the first wiring electrode 23 may be strengthened to prevent the first wiring electrode 23 from being separated. That is, the first wiring electrode 23 is strengthened by the auxiliary electrode 51 to the first sensing electrode 21, and thus the first sensing electrode 21 and the first wiring by external impact. The electrode 23 can be prevented from being electrically opened, and the impact reliability can be improved.

Although the first embodiment has described the particle size and the contact resistance, the first wiring electrode 23 and the auxiliary electrode 51 may be described as an electrical conductivity.

The first wiring electrode 23 and the auxiliary electrode 51 may have different conductivity. The auxiliary electrode 51 may have a first conductivity, and the first wiring electrode 23 may have a second conductivity. The first conductivity and the second conductivity may have different values. The first conductivity may have a value greater than the second conductivity. That is, the auxiliary electrode 51 has a faster charge transfer than the wiring electrode 23.

The first sensing electrode 21 and the first wiring electrode 23 are formed by forming the auxiliary electrode 51 having a relatively high conductivity between the first sensing electrode 21 and the first wiring electrode 23. Signal exchange between them becomes easy. Accordingly, the signal distortion can be prevented.

FIG. 5 is an enlarged view of a contact region of a touch panel according to a second embodiment, and FIG. 6 is a cross-sectional view taken along the line C-C ′ of FIG. 5.

Compared to the first embodiment, the second embodiment has the same configuration except that the auxiliary electrodes are formed at different positions. Therefore, in describing the second embodiment, the same reference numerals are assigned to the components common to the first embodiment, and detailed description thereof will be omitted.

5 and 6, a contact between the first sensing electrode 21 and the first wiring electrode 23 is in contact with the ineffective area UV of the first substrate 20 according to the second embodiment. Region 25 is present.

In the contact region 25, the first sensing electrode 21 may be electrically connected to the first wiring electrode 23.

The first wiring electrode 23 may be formed on at least a portion of the first sensing electrode 21. The first wiring electrode 23 may be formed at at least one end of the first sensing electrode 21. The first wiring electrode 23 may be formed at both ends of the first sensing electrode 21. The first wiring electrode 23 may be formed on the first sensing electrode 21 in the contact region 25.

An auxiliary electrode 151 may be formed in the contact region 25. The auxiliary electrode 151 may be formed to cover a part of the first sensing electrode 21 and a part of the first wiring electrode 23. The auxiliary electrode 151 may include first to

third regions

151a, 151b, and 151c.

The first region 151a may be connected to an upper portion of the first wiring electrode 23. The first region 151a may contact the upper portion of the first wiring electrode 23. The first region 151a may be formed to cover the first wiring electrode 23.

The second region 151b may be connected to the first sensing electrode 21. The second region 151b may contact the upper portion of the first sensing electrode 21. The second region 151b may be formed to cover the first sensing electrode 21.

The third region 151c may contact the first substrate 20. The third region 151c may be formed to cover the first substrate 20.

The third region 151c may be formed at both sides of the first region 151a. The third region 151c may be formed at both sides of the second direction crossing the array direction of the sensing electrode 21 with respect to the first region 151a.

The second region 151b may be formed between the first region 151a and the third region 151c. The second region 151b may be formed surrounding the first region 151a.

The first to third regions 151a to 151c may be integrally formed. The first to third regions 151a to 151c are defined according to the configuration in which the auxiliary electrode 151 contacts, and the auxiliary electrode 151 is integrally formed.

The auxiliary electrode 151 is formed to cover the first sensing electrode 21 and the first wiring electrode 23 in the contact region 25 so that the first sensing electrode 21 and the first wiring electrode are formed. The contact resistance between 23 decreases.

Since the second region 151b of the auxiliary electrode 151 is integrally formed with the first region 151a, the region of the first sensing electrode 21 that does not contact the first wiring electrode 23 is formed. Charge at may move to the first wiring electrode 23 through the auxiliary electrode 151. As a result, the contact resistance between the first sensing electrode 21 and the first wiring electrode 23 is reduced.

As described above in the first embodiment, the first wiring electrode 23 and the auxiliary electrode 151 may be formed of the same material, and the first wiring electrode 23 and the auxiliary electrode 151 may be It may be formed of different materials.

Even when the first wiring electrode 23 and the auxiliary electrode 151 are formed of the same material, particle sizes of the first wiring electrode 23 and the auxiliary electrode 151 may be different. The particle size of the auxiliary electrode 151 may be smaller than the particle size of the first wiring electrode 23. The auxiliary electrode 151 and the first wiring electrode 23 may have different shapes of particles.

Hereinafter, a case in which the first wiring electrode 23 and the auxiliary electrode 151 include silver (Ag) material will be described.

When the first wiring electrode 23 and the auxiliary electrode 151 include a silver material, the particle size of the first wiring electrode 23 may be 1 μm to 2 μm. The particle size of the auxiliary electrode 51 may be 0.2 μm to 1 μm.

The size of the particles of the auxiliary electrode 151 is smaller than the particle size of the first wiring electrode 23, so that the electrical contact is possible in the second region 151b with the first sensing electrode 21. This is improved.

Since the first sensing electrode 21 includes the nanowire 21a, a contact point between the particles of the auxiliary electrode 151 having a relatively small particle size and the nanowire 21a in the second region 151b is provided. As a result, the contact resistance between the first sensing electrode 21 and the auxiliary electrode 151 decreases.

The auxiliary electrode 151 forms a new charge transfer path between the first sensing electrode 21 and the first wiring electrode 23, and the first sensing electrode 21 is formed by the auxiliary electrode 151. The contact resistance between the first wiring electrodes 23 is reduced. The contact resistance between the first sensing electrode 21 and the first wiring electrode 23 is reduced by the auxiliary electrode 151, so that the signal between the first sensing electrode 21 and the first wiring electrode 23 is reduced. It is possible to prevent signal distortion due to RC delay that may occur during exchange.

In addition, the auxiliary electrode 151 is formed to cover the first sensing electrode 21 and the first wiring electrode 23 in the contact region 25, so that the first wiring electrode 23 is affected by an external impact. ) May be prevented from being separated from the first sensing electrode 21.

In addition, the third region 151c of the auxiliary electrode 151 is formed in contact with the upper surface of the first substrate 20 having a relatively strong adhesive force, so that the auxiliary electrode 151 is separated even if there is an external impact. As a result, electrical opening of the first sensing electrode 21 and the first wiring electrode 23 can be prevented.

The shape of the particles of the first wiring electrode 23 may be spherical, and the particles of the auxiliary electrode 151 may include a rod shape having directivity. Particle shapes of the auxiliary electrode 151 may have a spherical shape and a flake shape.

Since the auxiliary electrode 151 includes the flake particles, the contact resistance between the first sensing electrode 21 and the auxiliary electrode 151 may be reduced. Since the auxiliary electrode 151 is formed in the flake shape, the contact point of the first sensing electrode 21 with the nanowire 21a is increased to increase the contact resistance between the first sensing electrode 21 and the auxiliary electrode 151. Decreases.

As the contact resistance between the first sensing electrode 21 and the auxiliary electrode 151 decreases, the auxiliary electrode 151 has a new charge transfer path between the first sensing electrode 21 and the first wiring electrode 23. Accordingly, the contact resistance between the first sensing electrode 21 and the first wiring electrode 23 decreases.

Table 2 is a table showing contact resistances and whether or not defects occur when the auxiliary electrode 151 is formed in the contact region 25 and when the auxiliary electrode 151 is not formed.

TABLE 2

	Auxiliary Electrode Formation	Excluding auxiliary electrode	Remarks
Contact resistance (Ω)	554	645	14.1% decrease
Poor (reliability check)	Good	Bad after 120 hours

Referring to Table 2, the contact resistance value when the auxiliary electrode 151 is formed on the first sensing electrode 21 and the first wiring electrode 23 is 554Ω. In contrast, the contact resistance when the auxiliary electrode 151 is not formed is 645Ω.

When the auxiliary electrode 151 having the same material as that of the first wiring electrode 23 and having different sizes of particles is formed on the first sensing electrode 21 and the first wiring electrode 23, the first electrode is formed. The contact resistance between the sensing electrode 21 and the first wiring electrode 23 is reduced. The auxiliary electrode 151 reduces the contact resistance of 14.1% between the first sensing electrode 21 and the first wiring electrode 23.

In addition, after 120 hours have elapsed as a result of poor inspection under the conditions of high temperature (85 ° C.) and high humidity (85%) when the auxiliary electrode 151 is formed or not in the contact region 25. If the auxiliary electrode 151 is absent, a defect occurs. Under the same conditions, in the case of the touch panel in which the auxiliary electrode 151 is formed in the contact region 25, no defect occurred.

Hereinafter, a case in which the first wiring electrode 23 includes a silver material and the auxiliary electrode 151 is formed of carbon paste will be described.

The particle size of the first wiring electrode 23 may be 1 μm to 2 μm. The particle size of the auxiliary electrode 151 may be 0.4 μm.

Since the particle size of the auxiliary electrode 151 is smaller than that of the first wiring electrode 23, the auxiliary electrode 151 described above includes a silver material having a particle size of 0.2 μm to 1 μm. It can have the same effect as

Table 3 is a table showing contact resistances and the occurrence of defects when the auxiliary electrode 151 is formed in the contact region 25 and when the auxiliary electrode 151 is not formed.

TABLE 3

	Auxiliary Electrode Formation	Excluding auxiliary electrode	Remarks
Contact resistance (Ω)	598	645	7.3% decrease
Poor (reliability check)	Good	Bad after 120 hours

Referring to Table 3, the contact resistance value when the auxiliary electrode 151 is formed on the first sensing electrode 21 and the first wiring electrode 23 is 598 Ω. In contrast, the contact resistance when the auxiliary electrode 151 is not formed is 645Ω.

When the auxiliary electrode 151 having a material different from that of the first wiring electrode 23 is formed on the first sensing electrode 21 and the first wiring electrode 23, the first sensing electrode 21 and the first wiring electrode 23 are formed. The contact resistance between the first wiring electrodes 23 is reduced. The auxiliary electrode 151 reduces the contact resistance of 7.3% between the first sensing electrode 21 and the first wiring electrode 23.

That is, even when the auxiliary electrode 151 is formed of carbon paste, there is a significant reduction in contact resistance.

In addition, when the auxiliary electrode 151 is formed of the carbon paste having viscosity, adhesion to the first substrate 20, the sensing electrode 21, and the first wiring electrode 23 is enhanced. Separation of the first wiring electrode 23 and the auxiliary electrode 151 can be prevented. That is, the first sensing electrode 21 and the first wiring electrode 23 are electrically opened by external shock by preventing the first wiring electrode 23 from being separated by the auxiliary electrode 151. Can be prevented and the impact reliability can be improved.

In the first and second embodiments, the auxiliary electrode is formed on the first substrate. However, the auxiliary electrode is also formed on the contact regions of the second sensing electrode and the second wiring electrode formed on the second substrate. The effect can be obtained.

Referring to FIG. 7, the display device 200 may include an input button 210 for inputting a command from the outside, a camera 220 for capturing still images and videos, and a speaker 230 for outputting voice.

The display device 200 may include the touch panel 1 and the display panel (not shown) described above. The touch panel 1 may be formed on the front surface of the display panel (not shown) and exposed on the top surface of the display device 200. The display panel (not shown) may be attached to the touch panel 1.

The display panel (not shown) may display an image. The display panel may be a liquid crystal display panel or an organic light emitting display panel, and may be applied to various products such as a mobile phone, a TV, and a navigation device.

Although the display device is described as an apparatus to which the touch panel according to the embodiments of the present invention is applied as an example, the apparatus to which the touch panel according to the embodiments of the present invention is applied is not limited thereto. It can be used in various products such as a vehicle touch input device.

In the above description of the configuration and features of the present invention based on the embodiment according to the present invention, the present invention is not limited thereto, and various changes or modifications can be made within the spirit and scope of the present invention. It will be apparent to those skilled in the art that such changes or modifications fall within the scope of the appended claims.

Claims

A sensing electrode formed on the substrate;

A wiring electrode formed on at least one end of the sensing electrode; And

An auxiliary electrode formed on the wiring electrode;

And a first region of the auxiliary electrode contacts the sensing electrode and a second region of the auxiliary electrode contacts the wiring electrode.
The method of claim 1,

The sensing electrode may include at least one of silver nanowires, carbon nanowires, conductive polymers, carbon nanotubes, and graphene.
The method of claim 1,

And a third region of the auxiliary electrode contacts the substrate.
The method of claim 1,

The second region is a touch panel positioned outside the first region.
The method of claim 3,

The third region is a touch panel positioned outside the second region.
The method of claim 1,

The auxiliary electrode is formed in a region where the sensing electrode and the wiring electrode is connected.
The method of claim 1,

And the wiring electrode and the auxiliary electrode are made of the same material having different particle sizes.
The method of claim 7, wherein

And the wiring electrode and the auxiliary electrode include silver (Ag).
The method of claim 7, wherein

The particle size of the wiring electrode is larger than the particle size of the auxiliary electrode.
The method of claim 7, wherein

The particle size of the wiring electrode is 1㎛ to 2㎛,

The particle size of the auxiliary electrode is 0.2㎛ 1㎛ touch panel.
The method of claim 7, wherein

The auxiliary electrode includes a flake-shaped particle.
The method of claim 1,

And the wiring electrode and the auxiliary electrode are formed of different materials.
The method of claim 12,

The auxiliary electrode is formed of a carbon-based touch panel.
The touch panel of claim 1; And

And a display panel attached to the touch panel to display an image.