Touch screen panel

A touch screen panel includes a plurality of first connection patterns formed on a substrate; an insulation layer having a plurality of contact holes that exposes portions of the plurality of first connection patterns; and a plurality of first electrodes and a plurality of second electrodes formed on the insulating layer, wherein at least one of the plurality of first connection patterns connects at least one adjacent pair of the plurality of first electrodes through at least two of the plurality of contact holes that expose respective portions of the at least one of the plurality of first connection patterns, and at least one hollow is formed by portions of the at least one adjacent pair of the plurality of first electrodes being formed in the at least two of the plurality of contact holes.

This application claims the priority and the benefit of Korea Patent Application No. 10-2010-012617 filed on Feb. 11, 2010, the entire content of which is incorporated herein by reference for all purposes as if fully set forth herein.

BACKGROUND OF THE INVENTION

1. Field of the Invention

Embodiments of this invention relate to a capacitive type touch screen panel.

2. Discussion of the Related Art

Along with the development of the electronics industry, display devices, such as a liquid crystal display, an electroluminescent display, and a plasma display panel having a quick response speed, low power consumption, and an excellent color reproduction rate, have been in the spotlight. The display device is used for various electronic products such as a television, a monitor for a computer, a notebook computer, a mobile phone, a display unit of a refrigerator, a personal digital assistant, and an automated teller machine. In general, the display device interfaces with various input devices such as a keyboard, a mouse, and a digitizer. However, when a separate input device such as a keyboard, a mouse a digitizer is used, a user is required to know how to use the separate input device, and as the separate input device occupies space, the display device that is separate from the various input devices is inconvenient in view of customer satisfaction. Therefore, need for a convenient and simple input device that can reduce erroneous operation has gradually increased. According to such request a touch screen panel in which a user can input information by directly contacting with a screen by a finger or a pen is suggested.

Because the touch screen panel has a simple configuration while occurring little or no erroneous operations, can perform an input action without a separate input device, and has convenience in which the user can quickly and easily manipulate through contents displayed on a screen, the touch screen panel is applied to various display devices.

Touch screen panels are classified into a resistive type, a capacitive type, an electromagnetic type and so on according to a detection method of a touched portion. The resistive type touch screen panel determines a touched position by a voltage gradient according to resistance in a state that a DC voltage is applied to metal electrodes formed on an upper plate or a lower plate. The capacitive type touch screen panel senses a touched position according to a difference in capacitance created in an upper or lower plate when the user physically contacts with a conductive film formed on the upper or lower plate. The electromagnetic type touch screen panel detects a touched portion by reading an LC value induced as an electromagnetic pen touches a conductive film.

Hereinafter, a conventional capacitive type touch screen panel will be described with reference toFIGS. 1 and 2.FIG. 1is a top plan view illustrating a conventional capacitive type touch screen panel, andFIG. 2is a cross-sectional view illustrating the touch screen panel taken along line I-I′ and line II-II′ ofFIG. 1.

Referring toFIGS. 1 and 2, the conventional capacitive type touch screen panel includes an electrode forming part20, a routing wire forming part40, a pad part60, and a protective layer50.

The electrode forming part20is formed on a substrate10and includes a plurality of first electrodes21arranged in parallel in a first direction (for example, an X-axis direction) and a plurality of second electrodes22arranged to intersect in a direction (for example, an Y-axis direction) perpendicular to the first electrodes21. The first electrodes21and the second electrodes22intersect each other, but sustain an electrical insulation state by an insulation film30. Further, neighboring first electrodes21arranged in the first direction are connected to each other by a bridge41. That is, the bridge41connects the neighboring first electrodes21to each other through contact holes30aand30bformed in the insulation film30covering the first and second electrodes21and22.

The routing wire forming part40is formed on the substrate10at positions outside the electrode forming part20and includes a plurality of first routing wires42connected to the plurality of first electrodes21, respectively, and a plurality of second routing wires43connected to the plurality of second electrodes22, respectively.

The pad part60includes a plurality of first pads connected to the plurality of first electrodes21through the plurality of first routing wires42, respectively, and a plurality of second pads62connected to the plurality of second electrodes22through the plurality of second routing wires43, respectively.

The protective layer50covers the electrode forming part20and the routing wire forming part40and prevents the first and second electrodes21and22and the first and second routing wires42and43from being exposed to the outside.

Hereinafter, a method of manufacturing a conventional capacitive type touch screen panel will be described with reference toFIGS. 3A to 3D.

Referring toFIG. 3A, a first conductive layer for forming first and second electrodes is deposited on the substrate10including an electrode forming part20, a routing wire forming part40, and the pad part60through a deposition process such as a sputtering method. As the first conductive layer, an indium tin oxide (ITO) layer is generally used. After a photoresist is coated on the substrate10in which the first conductive layer is formed, a first photoresist pattern for exposing the first conductive layer is formed in the electrode forming part20by performing a photolithography process using a first mask. After removing the first conductive layer exposed by the first photoresist pattern through wet etching, a plurality of first electrodes21and a plurality of second electrodes22intersecting the first electrodes21are formed on the substrate10by ashing the remaining first photoresist pattern.

Referring toFIG. 3B, after the first insulation film30is formed on the substrate10in which the plurality of first and second electrodes21and22are formed, the first insulation film30of the pad part60and the routing wire forming part40is removed and first and second contact holes30aand30bpenetrating the first insulation film30of the electrode20are formed with a photolithography process and an etching process using a second mask. The first and second contact holes30aand30bexpose a portion of the neighboring first electrodes21. The first insulation film30includes silicon nitride, silicon oxide, or organic resin.

Referring toFIG. 3C, a second conductive layer is formed on an entire surface of the substrate10in which the first and second contact holes30aand30bare formed through a deposition process such as a sputtering method. The second conductive layer includes aluminum (Al) or molybdenum (Mo). After coating a photoresist on the substrate in which the second conductive layer is formed, first and second routing wires42and43are formed in a routing wire forming portion on the substrate10and a connection electrode41is formed on the first insulation film30of the electrode forming part20by performing a photolithography process and an etching process using a third mask. The connection electrode41connects the neighboring first electrodes21to each other through the first and second contact holes30aand30bformed in the first insulation film30.

Referring toFIG. 3D, after a second insulation film50as a protective film is formed on an entire surface of the substrate10in which the connection electrode41and the first and second routing wires42and43are formed, a through hole50afor penetrating the second insulation film50is formed to expose the first and second routing wires42and43of the pad60with a photolithography process and an etching process using a fourth mask.

However, the conventional capacitive type touch screen panel is manufactured with4mask processes, as described above, and each mask process accompanies a photolithography process requiring a series of continuous processes such as photoresist (PR), coating, alignment, exposure, development, and cleaning and thus it is necessary to reduce a number of a mask process. Further, because the first insulation film of an intersecting portion of the first electrode and the second electrode has a wide area and uses silicon nitride, silicon oxide, and organic resin, there is a problem that the first insulation film is viewed or apparent from the outside due to a color difference between the first insulation film and a periphery thereof. Further, the second insulation film formed as a protective film at the top of the touch screen panel is made of the same material as that of the first insulation film, and adhesive strength is weakened by gas used when depositing the first and second insulation films and thus surface hardness is weakened. Therefore, after a touch screen panel is manufactured, when a next process of forming a display device is performed, an additional problem of a scratch occurs.FIG. 4is a drawing illustrating states before and after performing a scratch test of the touch screen panel manufactured in the related art, wherein the left picture illustrates a state before a scratch test and the right picture illustrates a state after a scratch test.

SUMMARY OF THE INVENTION

An object of this invention is to provide a touch screen panel that can improve productivity by reducing a process tact time through reducing mask process number of a capacitive type touch screen panel.

Another object of this invention is to provide a touch screen panel that can solve a visibility problem occurring due to a color difference between a first insulation layer for covering a first electrode and a second electrode used as a touch electrode and having a wide area and a periphery thereof and that can improve a transmittance and a color transition characteristic.

Another object of this invention is to provide a touch screen panel that can solve a problem of a scratch occurring due to low surface hardness of a second insulation layer formed as a protective layer at the top of the touch screen panel.

Additional features and advantages of this invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of this invention. The objectives and other advantages of this invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

To achieve these and other advantages and in accordance with the purpose of this invention, as embodied and broadly described, a touch screen panel includes a substrate; an electrode forming part comprising a plurality of first electrode serials and a plurality of second electrode serials formed on the substrate, the plurality of first electrode serials being arranged in parallel in a first direction, and the plurality of second electrode serials being arranged to intersect the first electrode serials; a routing wire forming part formed on the substrate at positions outside the electrode forming part and comprising a plurality of first routing wires connected to the plurality of first electrode serials, respectively, and a plurality of second routing wires connected to the plurality of second electrode serials, respectively; a plurality of first connection patterns formed on the same layer with the pluralities of first and second routing wires; and an insulation layer formed between the pluralities of first and second electrode serials and the substrate, and having a plurality of contact holes to expose portions of the plurality of first connection patterns, wherein each of the plurality of first electrode serials comprises a plurality of first electrode patterns and each of the plurality of second electrode serials comprises a plurality of second electrode patterns, and the plurality of first electrode patterns is formed as separated plurality of patterns, and the separated plurality of patterns are connected to each other through the plurality of contact holes and by the plurality of first connection patterns.

Another embodiment of the invention includes a method of manufacturing a touch screen panel, the method including a first process of forming a plurality of first connection patterns, a plurality of first routing wires, and a plurality of second routing wires simultaneously on a substrate; a second process of forming an insulation layer on an entire surface of the substrate and a plurality of contact holes in the insulating layer for exposing portions of at least one of the plurality of first connection patterns; and a third process of forming a plurality of first electrode serials and a plurality of second electrode serials on the insulation layer in which the plurality of contact holes are formed, the plurality of first electrode serials being arranged in parallel in a first direction, and the plurality of second electrode serials being arranged in parallel in a second direction intersecting the first direction.

Another embodiment of the invention includes a touch screen panel including a substrate; a plurality of first connection patterns formed on the substrate; an insulation layer formed on the substrate to cover the plurality of first connection patterns, and having a plurality of contact holes that exposes portions of the plurality of first connection patterns; and a plurality of first electrodes and a plurality of second electrodes formed on the insulating layer, the plurality of first electrodes being arranged in parallel in a first direction, and the plurality of second electrodes being arranged in a second direction that intersects the first direction, wherein at least one of the plurality of first connection patterns connects at least one adjacent pair of the plurality of first electrodes through at least two of the plurality of contact holes that expose respective portions of the at least one of the plurality of first connection patterns, and at least one hollow is formed by portions of the at least one adjacent pair of the plurality of first electrodes being formed in the at least two of the plurality of contact holes.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Hereinafter, example embodiments of this invention will be described in detail with reference toFIGS. 5 to 16. Like reference numerals designate like elements throughout the specification.

An array substrate for a liquid crystal display according to an example embodiment of this invention will be described with reference toFIGS. 5 and 6.FIG. 5is a top plan view illustrating a touch screen panel according to an example embodiment of this invention, andFIG. 6is a cross-sectional view illustrating the touch screen panel taken along line I-I′ and line II-II′ ofFIG. 5.

Referring toFIGS. 5 and 6, a capacitive type touch screen panel according to an example embodiment of this invention includes an electrode forming part A, a routing wire forming part B, and a pad part C.

The electrode forming part A includes a plurality of first electrode serials130optionally arranged in parallel in a first direction (for example, an X-axis direction) and a plurality of second electrode serial135optionally arranged in a second direction (for example, an Y-axis direction) to intersect the first electrode serials130. Each of the first electrode serials130includes first electrode patterns131having a triangle, a quadrangle, a diamond shape, a polygon, and so on, and first connection patterns110for connecting neighboring first electrode patterns131. Each of the second electrode serials135includes second electrode patterns136having a triangle, a quadrangle, a diamond shape, a polygon, and so on, similar to the first electrode patterns131and second connection patterns137for connecting neighboring second electrode patterns136.

In an example embodiment of this invention, the first connection patterns110are formed separately from the first electrode patterns131, and the second connection patterns137are integrally formed with the second electrode patterns136. Alternatively, the first connection patterns110may be integrally formed with the first electrode patterns131, and the second connection patterns137may be formed separately from the second electrode patterns136.

The routing wire forming part B is formed on the substrate100at positions outside the electrode forming part A, and includes a plurality of first routing wires112connected to the plurality of first electrode serials130, respectively and a plurality of second routing wires114connected to the plurality of second electrode serials135, respectively.

The pad part C includes a plurality of first pads116connected to the plurality of first electrode serials130through the plurality of first routing wires112, respectively, and a plurality of second pads118connected to the plurality of second electrode serials135through the plurality of second routing wires114, respectively.

In the example embodiment of this invention, the first connection patterns110, and the first and second routing wires112and114are formed on a substrate100through a same process and are made of a same material. In other embodiments, the first connection patterns110, and the first and second routing wires112and114are formed of different materials. The first connection patterns110and the first and second routing wires112and114include one of Al, AlNd, Mo, MoTi, Cu, and Cr. Because these materials have a low resistivity, it is possible to lower contact resistance between the first and second electrode patterns131and136and the first connection pattern110or routing wires112and114. Because ITO has high resistivity and should have a thick thickness, it is difficult to use ITO as a routing wire, and thus ITO is not used in the embodiment. However, the ITO may be used if desired.

Further, it is preferable, though not necessary, that the first connection patterns110connecting the neighboring first electrode patterns are formed to have a thickness of about 2,000 Å to about 3,000 Å and a width of about 3 μm to about 10 μm. If a thickness of the first connection patterns110is less than 2,000 Å, the resistance of the first connection patterns110is high, and if a thickness of the first connection patterns110is larger than 3,000 Å, a step difference of a pattern increases. Also, if a width of the first connection patterns110is less than 3 μm, the resistance of the first connection patterns110is high, and if a width of the first connection patterns110is larger than 10 μm, the pattern is visible.

Further, in the example embodiment, because the first connection patterns110and the first and second routing wires112and114are formed through one same mask process, one mask process can be omitted, compared with the related art that forms a connection pattern for connecting electrode patterns and routing wires in a two mask processes. Accordingly, it is possible to reduce a cost and a tact time (manufacturing time required per product unit for achieving a daily production target amount).

In the example embodiment of this invention, an insulation layer120is formed on the substrate100in which the first connection patterns110and the first and second routing wires112and114are formed, and in the insulation layer120, first and second contact holes120aand120bfor exposing portions of each of the first connection patterns110, a third contact hole120cfor exposing one portion of the first routing wires112and a fourth contact hole120d(seeFIG. 8A) for exposing one portion of the second routing wires114are formed. The insulation layer120includes silicon nitride (SiNx). If a thickness of the insulation layer120is less than 5,000 Å, the insulation layer120may be destroyed or damaged by a voltage applied to the first electrode serial130and the second electrode serial135. Therefore, in order to prevent or reduce a phenomenon in which a failure occurs due to destruction or damage of the insulation layer120while using the touch screen panel, it is preferable, though not required, to form the insulation layer so that a thickness of the insulation layer is about 5,000 Å or more.

Further, if a thickness of the insulation layer120is about 6,000 Å, a saturation state in which a transmittance no longer increases is observed and a color transition phenomenon becomes a minimum. That is, in view of a transmittance and chromaticity expression, when a thickness of the insulation layer120is 6,000 Å or more, a transmittance becomes a maximum and a color transition phenomenon becomes a minimum and thus it is most preferable that the insulation layer120has a thickness of 6,000 Å or more. However, if a thickness of the insulation layer120exceeds 7,000 Å, it is difficult to form a contact hole and much more process time is required due to a characteristic of a silicon nitride layer used as a material of the insulation layer120. Accordingly, it is not preferable, though not required, that a thickness of the insulation layer120exceeds 7,000 Å. Therefore, when considering stability of the insulation layer120, a good light transmittance, and chromaticity expression ability together, it is preferable, though not required, to form a thickness of the insulation layer120in a range of 5,000 Å to 7,000 Å.

Further, a plurality of first electrode serials130and a plurality of second electrode serials135are formed on the insulation layer120in which the first to fourth contact holes120a,120b,120c, and120d(seeFIG. 8A) are formed. Each of the plurality of first electrode serials130includes a plurality of first electrode patterns131and is optionally arranged in a first direction (for example, an x-axis direction). Each of the plurality of second electrode serials135includes a plurality of second electrode patterns136and is optionally arranged in a second direction (for example, a y-axis direction) intersecting the first direction. Because the first electrode patterns131forming the first electrode serial130are separated from each other, the first electrode patterns131are connected to the portions of the first connection pattern110exposed through the first and second contact holes120aand120bformed in the insulation layer120, and the first electrode patterns131positioned at the outermost side are connected to the first routing wires112exposed through the third contact hole120c.

As shown inFIG. 6, portions of the plurality of first electrode patterns131are formed in the contact holes120a,120band120cso that the portions of the plurality of first electrode patterns131are partially filled in the contact holes120a,120band120c. For example, portions of the plurality of first electrode patterns131are formed on side walls of the contact holes120a,120band120c, and on exposed portions of the first connection patterns110and the first routing wires112. Accordingly, hollows or cavities122a,122b, and122care respectively formed by the portions of the plurality of first electrode patterns131being partially filled in the contact holes120a,120band120c.

The second electrode patterns136forming the second electrode serial135are integrally formed with the second connection patterns137and are connected to the second routing wires114exposed through the fourth contact hole120d(seeFIG. 8A).

The first and second electrode patterns131and136and the second connection patterns137are made of the same material through the same process. The first and second electrode patterns131and136and the second connection patterns137are made of a transparent metal material such as ITO or IZO. In the example embodiment, because the first and second electrode serials130and135and the second connection patterns137using ITO are formed in a top layer of the touch screen panel and ITO has very high hardness, a scratch does not occur in a subsequent process of forming a display device on the other surface of the substrate100of the touch screen panel, and thus a touch screen panel of a good quality is obtained.

Hereinafter, a method of manufacturing a capacitive type touch screen panel according to the example embodiment of this invention will be described with reference toFIGS. 7A to 9B.

FIGS. 7A to 7Bare a top plan view and a cross-sectional view illustrating a first mask process in the method of manufacturing the capacitive type touch screen panel according to the example embodiment of this invention.

Referring toFIGS. 5,7A, and7B, a first conductive pattern group including first connection patterns110, first routing wires112, and second routing wires114is formed on the substrate100including an electrode forming part A, the routing wire forming part B, and the pad part C using the first mask process.

In more detail, a first conductive layer is deposited on the substrate100through a deposition process such as a sputtering method. As the first conductive layer is patterned with a photolithography process and an etching process using a first mask, the first conductive pattern group including the first connection patterns110, the first routing wires112, and the second routing wires114is formed. Here, as a material forming the first conductive pattern group, Al, AlNd, Mo, MoTi, Cu, Cr, ITO and so on are used. The first connection pattern110formed in the electrode forming area A (seeFIG. 5) is formed to have a thickness of about 2,000 Å to about 3,000 Å and a width of about 3 μm to about 10 μm.

In another embodiment, the first conductive pattern group including the first connection patterns110, the first routing wires112, and the second routing wires114may be formed by being printed on the substrate100. Subsequent drying and/or heating process may be performed. In such a case, the photolithography process and the etching process using the first mask may be skipped. In other embodiments, other pattern forming processes may be used.

FIGS. 8A to 8Dare a top plan view and cross-sectional views illustrating a second mask process in a method of manufacturing a capacitive type touch screen panel according to the example embodiment of this invention. The first and second routing wires112and114indicated by dotted lines inFIG. 8Abecause they are covered by the insulation layer120, and the first and second routing wires112and114are portions that are not displayed in a top plan view, however for a better understanding, in this invention, the first and second routing wires112and114are indicated by dotted lines.

Referring toFIGS. 8A and 8B, the insulation layer120is formed through a deposition method such as sputtering on an entire surface of the substrate100in which the first conductive pattern group including the first connection patterns110, the first routing wires112, and the second routing wires114is formed. As a material of the insulation layer120, an inorganic insulation material such as silicon nitride (SiNx) is used. A thickness of the insulation layer120is preferably set to a range of about 5,000 Å to about 10,000 Å, more preferably, though not required, to a range of about 5,000 Å to about 7,000 Å.

After the insulation layer120is formed, as shown inFIG. 8C, a photoresist pattern210is formed on a portion in which the insulation layer120should exist by a photolithography process using a second mask. First to fourth contact holes120a,120b,120c, and120d(seeFIG. 8A) penetrating the insulation layer120are formed with a dry etching process using the photoresist pattern210. Next, when the photoresist pattern210is removed, as shown inFIG. 8D, first to fourth contact holes120a,120b,120c, and120dfor exposing the first conductive patterns110,112, and114are formed. Here, the first contact hole120aexposes a portion of the first connection pattern110, the second contact hole120bexposes another portion of the first connection pattern110, the third contact hole120cexposes a portion of the first routing wire112, and the fourth contact hole120d(seeFIG. 8A) exposes a portion of the second routing wire114.

FIGS. 9A to 9Bare a top plan view and a cross-sectional view illustrating a third mask process in the method of manufacturing the capacitive type touch screen panel according to the example embodiment of this invention.FIG. 9Ais a top plan view illustrating the third mask process in the method of manufacturing the capacitive type touch screen panel according to the example embodiment of this invention, and for a better understanding, inFIG. 9A, the insulation layer120formed between the first conductive pattern group and the second conductive pattern group is not depicted.

Referring toFIGS. 9A and 9B, the second conductive pattern groups including a plurality of first electrode serials130and a plurality of second electrode serials135formed on the insulation layer120in which the first to fourth contact holes120a,120b,120c, and120d(seeFIG. 8A) are formed using the third mask process. The plurality of first electrode serials130are optionally arranged in parallel in a first direction (for example, an x-direction). And the plurality of second electrode serials135are optionally arranged in parallel in a second direction (for example, a y-direction) intersecting the first direction.

In more detail, the second conductive layer is deposited through a deposition process such as sputtering on an entire surface of the insulation layer120in which the first to fourth contact holes120a,120b,120c, and120d(seeFIG. 8A) are formed. Thereafter, the second conductive layer is patterned with a photolithography process and an etching process using a third mask to form the second conductive pattern group including a plurality of first electrode serials130arranged parallel in the first direction (for example, an x-direction) and a plurality of second electrode serials135arranged parallel in the second direction (for example, an y-direction) intersecting the first direction. Here, each of the first electrode serials130includes the plurality of first electrode patterns131, and each of the second electrode serials135includes the plurality of second electrode patterns136and the second connection patterns137for connecting neighboring second electrode patterns136. As a material of the second conductive layer, ITO is used, and if a thickness thereof is about 1,200 Å to about 1,600 Å, a maximum transmittance can be obtained.

Also, as shown inFIG. 9B, portions of the plurality of first electrode patterns131are deposited in the contact holes120a,120band120cso that the portions of the plurality of first electrode patterns131are partially filled in the contact holes120a,120band120c. For example, portions of the plurality of first electrode patterns131are deposited on side walls of the contact holes120a,120band120c, and on exposed portions of the first connection patterns110and the first routing wires112. Accordingly, hollows or cavities122a,122b, and122care respectively formed by the portions of the plurality of first electrode patterns131being partially filled in the contact holes120a,120band120c.

In embodiments of the invention, a cross section that is perpendicular to an axial direction of at least one of the first to fourth contact holes120a,120b,120c, and120dmay be any shape. A rectangular shape is shown inFIG. 8A, but embodiments of the invention includes having circular, oval, polygonal, or irregular shapes. Additionally, at least one of the hollows or cavities122a,122b, and122cmay be formed to extend in an axial direction of at least one of the first to fourth contact holes120a,120b,120c, and120d(seeFIG. 8A). Additionally, a depth of at least one of the hollows or cavities122a,122b, and122cmay be about 2,000 Å to about 9,000 Å in the axial direction depending on a thickness of the insulation layer120and at thickness of the pluralities of first and second electrode patterns.

Here, each of the first and second electrode patterns131and136is formed in a triangle, a quadrangle, a diamond, a polygon shape and so on, but a shape of the first and second electrode patterns131and136is not limited thereto and may include other random shapes. Further, in the example embodiment of this invention, the first electrode patterns131formed on the insulation layer120are separated, and the second electrode patterns136are integrally formed with the second connection pattern137, but the first electrode patterns131may be integrally formed with a connection pattern on the insulation layer120, and the second electrode patterns136may be separated. In this later instance, the second electrode patterns136are electrically connected by another connection pattern formed between the insulation layer120and the substrate100.

Next, a pad part C including a plurality of first pads116and a plurality of second pads118is formed. The plurality of first pads116are connected to the plurality of first electrode serials130through the plurality of first routing wires112, respectively, and the plurality of second pads118are connected to the plurality of second electrode serials135through the plurality of second routing wires114, respectively.

According to the example embodiment of this invention, because the first connection patterns110and the first and second routing wires112and114are formed through the same process, at least one mask process may be omitted. Therefore, a cost can be reduced and a tact time can be reduced according to reduction of the number of masks.

Further, in the example embodiment, because silicon nitride (SiNx) is used as the insulation layer120, a visibility problem occurring due to a color difference between the insulation layer120and a periphery can be solved or reduced. Because a thickness of the insulation layer120is set to a range of 5,000 Å to 7,000 Å, a transmittance becomes a maximum and a color transition phenomenon becomes a minimum and thus a destruction or damage phenomenon of the insulation layer120can be suppressed. Therefore, stability of the touch screen panel can be remarkably improved.

FIGS. 10 to 12are simulation graphs illustrating a breakdown voltage, a transmittance, and a color transition characteristic according to a thickness of silicon nitride in the touch screen panel formed by using ITO as the first and second electrode patterns131and136and using silicon nitride as the insulation layer120.

FIG. 10is a graph illustrating an electric field value of a breakdown point in which an insulation layer is destroyed or damaged according to a thickness of silicon nitride used as an insulation layer when a thickness of ITO used as first and second electrode patterns is about 1,400 Å. InFIG. 10, a horizontal axis represents a thickness (Å) of silicon nitride and a vertical axis represents intensity (MV/cm) of an electric field. As shown inFIG. 10, it is very important to appropriately adjust a thickness of silicon nitride because silicon nitride is destroyed or damaged when an electric field of 10 megavolt/cm or more is applied. In a condition in which a voltage (this value is a reliability condition of a touch screen panel manufacturer) of 500 volts or less is applied between the first and second electrode patterns131and136of the touch screen panel, when a thickness of silicon nitride is about 5,000 Å or less, insulation of silicon nitride was destroyed or damaged. Therefore, silicon nitride as the insulation layer120should be formed in a thickness of 5,000 Å or more.

FIG. 11is a graph illustrating a transmittance of a touch screen panel according to a thickness of silicon nitride used as the insulation layer120when a thickness of ITO using as the first and second electrode patterns131and136is about 1,400 Å. InFIG. 11, a horizontal axis represents a thickness (Å) of silicon nitride and a vertical axis represents a transmittance (%), “AIR” represents a transmittance of an instance in which a polarization sheet is not attached to the touch screen panel, and “POL” represents a transmittance of instance in which a polarization sheet is attached to the touch screen panel. As can be seen fromFIG. 11, in a thickness of 5,000 Å or more in which the insulation layer120is not destroyed or damaged, a transmittance gradually increases in a thickness of about 5,000 Å, arrives at a peak value in a thickness of about 6,000 Å, falls again to a thickness of about 6,500 Å, and increases again to a thickness of about 7,000 Å. That is, in an insulation layer thickness of 6,000 Å or more, because a transmittance is saturated, even if a thickness deviation occurs, there is no or little change of transmittance.FIG. 11shows that a single touch screen panel has a transmittance of about 89%, and when a polarization sheet is attached to the touch screen panel, a transmittance of about 93% was obtained.

FIG. 12is a graph illustrating a color transition characteristic of the touch screen panel according to a thickness of silicon nitride used as an insulation layer when a thickness of ITO used as first and second electrode patterns is 1,400 Å. InFIG. 12, a horizontal axis represents a thickness (Å) of silicon nitride and a vertical axis represents a chrominance, “AIR” represents a chrominance of an instance in which a polarization sheet is not attached to the touch screen panel, and “POL” represents a chrominance of an instance in which a polarization sheet is attached to the touch screen panel. As can be seen fromFIG. 12, similarly to an instance of a transmittance, in a thickness of 5,000 Å or more in which the insulation layer120is not destroyed or damaged, a color transition characteristic is similar to a transmittance characteristic.

FIGS. 13 and 14are simulation graphs of a transmittance characteristic and a color transition characteristic according to a thickness of an ITO layer in the touch screen panel formed by using ITO as the first and second electrode patterns131and136and using silicon nitride as an insulation layer120.

FIG. 13is a graph illustrating a characteristic of transmittance according to a thickness of ITO used as the first and second electrode patterns131and136when a thickness of silicon nitride formed as an insulation layer120is 6,000 Å. InFIG. 13, a horizontal axis represents a thickness (Å) of an ITO layer, a vertical axis represents a transmittance (%), “AIR” represents a transmittance of an instance in which a polarization sheet is not attached to the touch screen panel, and “POL” represents a transmittance of an instance in which a polarization sheet is attached to the touch screen panel. As can be seen fromFIG. 13, a thickness of silicon nitride is fixed to 6,000 Å and a light transmittance according to an ITO thickness has a minimum value in 700 Å and has a maximum value in 1400 Å.

FIG. 14is a graph illustrating a color transition characteristic according to a thickness of ITO used as first and second electrode patterns when a thickness of silicon nitride formed as an insulation layer is 6,000 Å. InFIG. 14, a horizontal axis represents a thickness (Å) of an ITO layer and a vertical axis represents a chrominance, “AIR” represents a color transition degree of an example in which a polarization sheet is not attached to the touch screen panel, and “POL” represents a color transition degree of an instance in which a polarization sheet is formed in the touch screen panel. As can be seen fromFIG. 14, when a thickness of silicon nitride is fixed to 6,000 Å and a color transition degree according to an ITO thickness is measured, the color transition degree has a minimum value in about 700 Å, and thus an optimum ITO thickness is obtained in about 100 Å or about 1400 Å. However, in a display of a notebook computer size or more, due to a resistance problem, an optimum ITO thickness is obtained in about 1400 Å. In a consideration of a thickness range of silicon nitride used in the example embodiment, when a thickness of ITO is about 1,200 Å to about 1,600 Å, a maximum transmittance is obtained.

Further, in the example embodiment, because the first and second electrode serials130and135and the second connection patterns137are formed on a top layer of the touch screen panel, a scratch does not occur in a subsequent process.

FIG. 15is a drawing illustrating a result before and after performing a scratch test of an area A in which the top of a touch screen panel is an insulation layer and an area B in which the top of a touch screen panel is ITO. In the result after performing a scratch test, a scratch occurs in the area A of the insulation layer, but a scratch does not occur in the area B of ITO.

Further, as a thickness of the first connection pattern formed between the insulation layer and the substrate to connect the first electrode patterns is formed in about 2,000 Å to about 3,000 Å, good proccessability and an appropriate resistance value can be obtained, and as a width is set to a range of about 3 μm to about 10 μm, a pattern is not visible.

FIG. 16is a cross-sectional view illustrating a touch screen panel according to another embodiment of the invention. Similar to the touch screen panel shown in FIG.6, the touch screen panel ofFIG. 16includes a substrate100, first connection patterns110and first routing wires112formed on a substrate100, an insulation layer121formed over the substrate100, first and second contact holes121aand121bfor exposing portions of the first connection patterns110and a third contact hole121cfor exposing one portion of the first routing wires112and a fourth contact hole (not shown but similar to120dofFIG. 8A) for exposing one portion of second routing wires114. In the embodiment ofFIG. 16, at least one of the first to fourth contact holes are formed in the insulating layer121at an angle so that the contact hole narrows in a depth-wise (or axial) direction. In other embodiments, the contact hole may widen in the depth-wise (or axial) direction. The angle between the a side of at least one of the contact holes, and a surface of the substrate110, for example, may be acute or obtuse. In an embodiment of the invention, the angle may be between about 30° to about 90°.

Further, a plurality of first electrode serials130and a plurality of second electrode serials135are formed on the insulation layer121in which the first to fourth contact holes are formed. Each of the plurality of first electrode serials130includes a plurality of first electrode patterns131aand is optionally arranged in a first direction (for example, an x-axis direction). Each of the plurality of second electrode serials135includes a plurality of second electrode patterns (not shown) and is optionally arranged in a second direction (for example, a y-axis direction) intersecting the first direction. Because the first electrode patterns131aforming the first electrode serial130are separated from each other, the first electrode patterns131aare connected to the portions of the first connection pattern110exposed through the first and second contact holes121aand121bformed in the insulation layer121, and the first electrode patterns131apositioned at the outermost side are connected to the first routing wires112exposed through the third contact hole121c.

As shown inFIG. 16, portions of the plurality of first electrode patterns131aare formed in the contact holes121a,121band121cso that the portions of the plurality of first electrode patterns131are partially filled in the contact holes121a,121band121c. For example, portions of the plurality of first electrode patterns131aare formed on side walls of the contact holes121a,121band121c, and on exposed portions of the first connection patterns110and the first routing wires112. Accordingly, at least one of hollows or cavities123a,123b, and123care respectively formed by the portions of the plurality of first electrode patterns131abeing partially filled in the contact holes121a,121band121c. Additionally, a surface of the first electrode patterns131aexposed to the at least one of the hollows or cavities123a,123b, and123c, may have an angle with respect to the substrate110that may be acute or obtuse. In an embodiment of the invention, at least one of the angles may be between about 30° to about 90.

In an embodiment of the invention, the hollows or cavities need not be opened at one end. That is, an opening of at least one of the hollows or cavities may be plugged by a portion of at least one of first electrode patterns.

The touch screen panels according to the example embodiments of this invention may be applied to display devices such as a liquid crystal display, a field emission display, a plasma display panel, an electroluminescence device, an electrophoresis display and a flexible display. In these cases, the substrates of the touch screen panels may be also used as substrates of the display devices.

Although example embodiments have been described with reference to a number of illustrative examples, it should be understood that numerous other modifications and changes can be devised by those skilled in the art that will fall within the scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.