JP2010198336A - Touch panel and display apparatus including the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a touch panel suppressing reduction in accuracy of position detection by a simple configuration and having high reliability, and to provide a display apparatus including the touch panel. <P>SOLUTION: The touch panel 20 includes: an insulating substrate 10; a touch detection electrode 11 rectangularly provided on the insulating substrate 10; and a linearization pattern 12 provided along each side of the touch detection electrode 11, on the touch detection electrode 11. The pitch of the linearization pattern 12 provided along the long side 11a of the touch detection electrode 11 is set to ≤7.1 mm. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a touch panel, and more particularly, to a capacitive touch panel and a display device including the same.

  In recent years, electronic devices such as vending machines, ATMs, portable game machines, car navigation systems, and the like have been provided with a touch panel that is an apparatus for operating electronic devices by touching a screen. This touch panel is an apparatus that inputs information interactively to an electronic device by touching (pressing) with a finger or a pen.

  This touch panel is classified into a resistance film method, a capacitance method, an infrared method, an ultrasonic method, an electromagnetic inductive coupling method, and the like according to the operation principle. In addition, since a resistive film type and capacitive coupling type touch panel can be mounted on a display device or the like at a low cost, it has been widely used in recent years, but in particular, it has a high transmittance and a durable static. Capacitive touch panels are attracting attention.

  This capacitive touch panel includes an insulating substrate, a touch detection electrode on a rectangle provided on the insulating substrate, a frame wiring provided in a frame shape along the periphery of the touch detection electrode, It is connected to the frame wiring and has a plurality of lead wirings that are pulled out to connect to the position detection circuit for detecting the touch position. For example, it is used by being attached to the front of the display screen of the liquid crystal display panel. The

  In addition, in the liquid crystal display panel including the capacitive coupling type touch panel, the touch detection electrode is touched by touching the front surface of the display screen, that is, the surface of the substrate constituting the touch panel. The resistance value between the four corners of the frame wiring and the grounding point is changed by being grounded through the electrostatic capacitance, and the position detection circuit detects the touched position based on the change in the resistance value. It has become.

  In addition, in a surface-type capacitive touch panel having a large-area single element structure, a predetermined linearization pattern is formed along each side of the touch detection electrode in order to improve position detection accuracy. Thus, parallel electrolysis is formed in the touch detection electrode. The linearization pattern is generally formed by screen printing a metal paste such as a silver paste (see, for example, Patent Document 1).

Special table 2007-524174 gazette

  However, if the linearization pattern is formed with a metal paste such as silver paste using the screen printing method, the variation in the width and thickness of the linearization pattern increases, and thus there is a variation in resistance value in the linearization pattern. Will occur. Then, in the touch panel, the resistance value between the four corners of the linearization pattern and the ground point varies, and the detected position is shifted inward from the actually touched position on the touch panel, for example. There is a problem that the position detection accuracy is lowered.

  Further, when the linearization pattern is formed with a metal paste such as silver paste, there is a problem that the position detection accuracy varies depending on the type of silver paste used, and the reliability is lowered.

  Accordingly, the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a touch panel having high reliability and a touch panel that can suppress a decrease in position detection accuracy with a simple configuration. An object of the present invention is to provide a display device including

  In order to achieve the above object, an invention according to claim 1 is directed to an insulating substrate, a touch detection electrode provided on the insulating substrate in a rectangular shape, and each side of the touch detection electrode on the touch detection electrode. A capacitance type touch panel provided with a linearization pattern provided along the line, and the pitch of the linearization pattern provided along the long side of the touch detection electrode is 7.1 mm or less It is characterized by.

  According to this configuration, since the pitch of the linearization pattern provided along the long side of the touch detection electrode is 7.1 mm or less, the resistance variation difference between the touch detection electrode and the linearization pattern is reduced. can do. Accordingly, it is possible to reduce the difference between the detection position and the position actually touched on the touch panel, and thus it is possible to effectively suppress a decrease in position detection accuracy.

  In addition, for example, even when the linearization pattern is formed using a metal paste such as silver paste, fluctuations in position detection accuracy can be effectively suppressed without depending on the type of silver paste. Therefore, it is possible to provide a touch panel with high reliability.

  A second aspect of the present invention is the touch panel according to the first aspect, wherein the pitch is 4.9 mm or less.

According to this configuration, since the pitch of the linearization pattern provided along the long side of the touch detection electrode is 4.9 mm or less, the resistance variation difference between the touch detection electrode and the linearization pattern is further increased. Can be relaxed.
Accordingly, it is possible to further reduce the deviation between the detection position and the actually touched position on the touch panel, so that it is possible to more effectively suppress a decrease in position detection accuracy.

  A third aspect of the present invention is the touch panel according to the first or second aspect, wherein the linearization pattern includes a first segment and a second segment arranged adjacent to the first segment. The width of the first segment and the second segment is 200 μm or more, and the distance between the first segment and the second segment is 200 μm or more.

  According to this configuration, the width of the first segment and the second segment constituting the linearization pattern is 200 μm or more, and the interval between the first segment and the second segment is 200 μm or more. It is possible to further alleviate the resistance fluctuation difference with the lysation pattern. Accordingly, it is possible to further reduce the deviation between the detected position and the actually touched position on the touch panel, so that it is possible to more effectively suppress a decrease in position detection accuracy.

  Invention of Claim 4 is a touchscreen of any one of Claims 1-3, Comprising: The linearization pattern is formed with the metal paste or the organic electrically conductive film, It is characterized by the above-mentioned. To do.

  According to this configuration, the linearization pattern is formed at a low temperature on a plastic substrate formed of a resin such as polyethylene terephthalate resin, polycarbonate resin, and acrylic resin, as well as a high heat resistance insulating substrate such as a glass substrate. It becomes possible to form. Further, the roll-to-roll method makes it possible to produce a large amount continuously by making the unwinding portion and the winding portion of the long substrate relatively compact, thereby improving the productivity. Further, for example, a linearization pattern can be directly formed on a resin cover that can be molded into a lightweight and three-dimensional shape or a liquid crystal display panel substrate after liquid crystal injection at a low temperature of 130 ° or less, for example. It becomes possible.

  The invention described in claim 5 is the touch panel according to claim 4, wherein the metal paste and the organic conductive film are formed by a screen printing method.

  According to this configuration, it is possible to easily form a linearization pattern as compared with other manufacturing methods such as a vacuum film forming method.

  The invention described in claim 6 is the touch panel according to claim 4 or 5, wherein the metal paste is a silver paste.

  According to this configuration, the silver paste has a relatively high adhesion strength with the electrode material of the touch panel, is highly reliable, and has many varieties compared to other metal pastes. Easy to select and easy to design.

  Moreover, the touch panel of Claims 1-6 of this invention is equipped with the outstanding characteristic that the fall of a position detection precision can be suppressed effectively. Therefore, like the invention of Claim 7, it is suitably used for a display device comprising a display panel and the touch panel according to any one of Claims 1 to 6 provided on the display panel. The Further, as in the invention according to claim 8, the display device according to claim 7 is preferably used for a display device in which the display panel is a liquid crystal display panel.

  ADVANTAGE OF THE INVENTION According to this invention, in an electrostatic capacitance type touch panel, the shift | offset | difference of a detection position and the position actually touched on a touch panel can be made small, and the fall of position detection accuracy can be suppressed effectively. become.

It is a top view of the touch panel which comprises the liquid crystal display device which concerns on embodiment of this invention. It is a figure which shows schematic structure of the liquid crystal display device which concerns on embodiment of this invention, and is AA sectional drawing of FIG. It is a plane schematic diagram which shows one side of the linearization pattern which comprises the touchscreen which concerns on embodiment of this invention. FIG. 4 is a partially enlarged view of FIG. 3. It is a plane schematic diagram which shows one side of the linearization pattern which comprises the touchscreen which concerns on embodiment of this invention. It is a plane schematic diagram which shows one side of the linearization pattern which comprises the touchscreen which concerns on embodiment of this invention. It is the elements on larger scale of FIG. It is sectional drawing which shows schematic structure of the modification of the liquid crystal display device which concerns on embodiment of this invention. It is sectional drawing which shows schematic structure of the modification of the liquid crystal display device which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, a liquid crystal display device is exemplified as the display device. FIG. 1 is a plan view of a touch panel constituting a liquid crystal display device according to an embodiment of the present invention, and FIG. 2 is a diagram showing a schematic configuration of the liquid crystal display device according to the embodiment of the present invention. It is AA sectional drawing. 3 is a schematic plan view showing one side of the linearization pattern constituting the touch panel according to the embodiment of the present invention, and FIG. 4 is a partially enlarged view of FIG. FIG. 5 is a schematic plan view showing one side of the linearization pattern constituting the touch panel according to the embodiment of the present invention. 6 is a schematic plan view showing one side of the linearization pattern constituting the touch panel according to the embodiment of the present invention, and FIG. 7 is a partially enlarged view of FIG.

  As shown in FIG. 2, the liquid crystal display device 40a includes, for example, an active matrix driving type liquid crystal display panel 30 and a surface-type capacitive touch panel 20 provided on the liquid crystal display panel 30 via an adhesive layer 25a. And.

  As shown in FIG. 2, the liquid crystal display panel 30 is provided between an active matrix substrate 31 and a counter substrate 32 provided as a pair of substrates arranged to face each other, and between the active matrix substrate 31 and the counter substrate 32. Liquid crystal layer (not shown). Note that polarizing plates (not shown) are respectively attached to the upper and lower surfaces of the liquid crystal display panel 30.

  The active matrix substrate 31 includes, for example, a plurality of gate lines (not shown) provided so as to extend in parallel with each other on a glass substrate, a gate insulating film (not shown) provided so as to cover each gate line, A plurality of source lines (not shown) provided on the gate insulating film so as to extend in parallel to each other in a direction orthogonal to the gate lines, and a plurality of source lines provided at each gate line and each intersection of the source lines. TFT (Thin Film Transistor, not shown), an interlayer insulating film (not shown) provided so as to cover each TFT and each source line, and provided in a matrix on the interlayer insulating film and connected to each TFT A plurality of pixel electrodes (not shown) and an alignment film (not shown) provided so as to cover each pixel electrode are provided. Here, each pixel electrode constitutes a pixel which is the minimum unit of an image, and constitutes a display area for displaying an image as a whole by arranging in a matrix.

  The counter substrate 32 includes, for example, a black matrix (not shown) provided in a frame shape on the glass substrate and in a lattice shape in the frame, and a red layer, a green layer, and a black layer provided between the lattices of the black matrix, respectively. A colored layer (not shown) such as a blue layer, a common electrode (not shown) provided so as to cover the black matrix and each colored layer, and an alignment film (not shown) provided so as to cover the common electrode I have.

  As shown in FIG. 2, the touch panel 20 is provided on the front surface of the liquid crystal display panel 30. Thereby, the touch panel 20 can input various information by pressing the surface of the touch panel 20 while seeing through the liquid crystal display panel 30 of the liquid crystal display device 40a.

  Further, as shown in FIGS. 1 and 2, the touch panel 20 extends along, for example, a rectangular insulating substrate 10 such as a glass substrate and one edge (the right side in FIG. 1) of the insulating substrate 10. A T-shaped substrate 15a such as an FPC (flexible printed circuit) fixed to the region via an ACF (Anisotropic Conductive Film, not shown) or the like is provided.

  As shown in FIGS. 1 and 2, the touch detection electrode 11 is provided in a rectangular shape on the upper surface of the insulating substrate 10. Further, a linearization pattern 12 is provided on the touch detection electrode 11 so as to extend along each side of the touch detection electrode 11. More specifically, the linearization pattern 12 includes a first linearization pattern 12a extending along the long side 11a of the touch detection electrode 11 and a short side 11b of the touch detection electrode 11. The second linearization pattern 12b is provided.

  The linearization pattern 12 is connected to the periphery of the touch detection electrode 11, and is formed in a frame shape by connecting the first linearization pattern 12a and the second linearization pattern 12b. This linearization pattern 12 is for forming parallel electrolysis in the touch detection electrode 11, and is for uniformizing the electric field distributed on the touch detection electrode 11 and improving the linearity thereof.

  Further, one edge of the insulating substrate 10 (the right side in FIG. 1) is drawn from each corner of the touch detection electrode 11 (or the four corners of the linearization pattern 12) and along the periphery of the insulating substrate 10. ) Is provided with a pair of first lead wires 13a and a pair of second lead wires 13b.

  The insulating substrate 10 is a glass substrate, a plastic substrate, or the like. As the glass substrate, for example, soda lime glass, quartz glass, alkali glass, borosilicate glass, plate glass and the like are used. The plastic substrate is formed of, for example, polyethylene terephthalate resin, polycarbonate resin, acrylic resin, or the like.

  The touch detection electrode 11 is formed of, for example, a transparent conductive film or a colored translucent conductive film made of ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), an organic conductive material, or the like.

  The linearization pattern 12 is formed of a conductive material, and for example, a metal paste or an organic conductive film can be used as the conductive material. As the metal paste, for example, silver paste, gold paste, copper paste, carbon paste, etc. can be used. As the organic conductive film, for example, Clevios V3 made by Starck, HK series made by Nissan Chemical Industries (polyanine dispersion type) Or a transparent conductive film under development by Cambrios. Note that these materials may be used alone or in combination of two or more.

  In addition, the first lead wiring 13a and the second lead wiring 13b are, for example, a single-layer or multi-layer relatively thin metal film made of a simple substance such as aluminum, titanium, copper, molybdenum, tantalum, or an alloy thereof, or A relatively thick metal film made of a metal paste such as silver, palladium, silver-palladium, or copper is used.

  As shown in FIG. 3, the first linearization pattern 12 a includes a first segment 40 and a second segment 41 arranged adjacent to the first segment 40.

  In the present embodiment, from the viewpoint of suppressing a decrease in position detection accuracy, as shown in FIG. 4, the pitch of the first linearization pattern 12a (that is, the length direction of the first linearization pattern 12a). The distance between the adjacent first segment 40 and the second segment 41 in P) is set to 7.1 mm or less. In this case, as shown in FIG. 3, the linear number (that is, the total number of the first segment 40 and the second segment 41) in the first linearization pattern 12a is seven.

  In general, the silver paste that forms the linearization pattern 12 has a smaller resistance variation than the ITO that forms the touch detection electrode 11, and therefore, due to the difference in resistance variation between the silver paste and ITO, The balance in the distribution of the current flowing in parallel is lost, and the position detection accuracy is lowered.

  On the other hand, in this embodiment, as described above, since the pitch P of the first linearization pattern 12a is set to 7.1 mm or less, the linear number increases and the current flows between the silver paste and the ITO interface. The number of passes increases. As a result, since the resistance fluctuation difference between the silver paste and ITO is relaxed, it is possible to effectively suppress a decrease in position detection accuracy.

  Note that, from the viewpoint of further suppressing a decrease in position detection accuracy, it is preferable to set the pitch P of the first linearization pattern 12a to 4.9 mm or less. In this case, in the present embodiment, the linear number in the first linearization pattern 12a is 11 as shown in FIG.

  In addition, the width W of the first segment 40 and the second segment 41 is not particularly limited, but the width W is preferably set to 200 μm or more from the viewpoint of further suppressing a decrease in position detection accuracy.

  Similarly, the interval between the first segment 40 and the second segment 41 (that is, the adjacent first segment 40 and second segment 41 in the direction Y orthogonal to the length direction X of the first linearization pattern 12a). The distance S is not particularly limited, but the distance S is preferably set to 200 μm or more from the viewpoint of further suppressing a decrease in position detection accuracy.

  In addition, as shown in FIG. 3, the current flowing in the touch detection electrode 11 is made parallel at both ends of the first linearization pattern 12a in the length direction X of the first linearization pattern 12a to detect the detection positions. In order to improve accuracy, a high resistance pattern 42 for distributing current is formed.

  Similarly to the first linearization pattern 12a, as shown in FIG. 6, the second linearization pattern 12b includes a first segment 40 and a second segment arranged adjacent to the first segment 40. 41.

  The second linearization pattern 12b is designed as the same linear number as the first linearization 12a because there is no clear design rule at present. Further, the pitch (that is, the distance between the adjacent first segment 40 and second segment 41 in the length direction x of the second linearization pattern 12b) p of the second linearization pattern 12b is set to 5.7 mm. The number of linear elements in the second linearization pattern 12b is seven.

  In the present embodiment, the width w of the first segment 40 and the second segment 41 in the second linearization pattern 12b is 100, 150, 200, and 300 mm. It can be said that it is preferable. Further, the distance between the first segment 40 and the second segment 41 in the second linearization pattern 12b (that is, the adjacent first segment 40 in the direction y orthogonal to the length direction x of the second linearization pattern 12b). As for the distance (s) of the second segment 41), as a result of studying at 150, 200, and 300 mm, it can be said that 200 mm or more is preferable because of high detection accuracy.

  Similarly to the first linearization pattern 12a, as shown in FIG. 6, high resistance patterns are formed at both ends of the second linearization pattern 12b in the length direction x of the second linearization pattern 12b. 42 is formed.

  As shown in FIG. 1, the first lead-out wiring 13 a is led out clockwise from the upper left corner and upper right corner of the touch detection electrode 11.

  As shown in FIG. 1, the second lead-out wiring 13 b is led out counterclockwise from the lower left corner and the lower right corner of the touch detection electrode 11.

  As shown in FIG. 1, a linear connection is provided at each end of the first lead-out wiring 13a and the second lead-out wiring 13b so as to extend along one end edge (the right side in FIG. 1) of the insulating substrate 10. Terminals T are provided respectively. The interval between the connection terminals T is, for example, about several hundred μm.

  In each of the first lead wires 13a and each second lead wire 13b, the connection terminals T are provided adjacent to each other as shown in FIG.

  As shown in FIG. 1, between the region where the connection terminal T of each first lead wire 13a is provided and the region where the connection terminal T of each second lead wire 13b is provided, the insulating substrate 10 and A pair of alignment marks M for aligning with the second substrate 15a is provided so as to be separated in a direction perpendicular to one end edge (the right side in FIG. 1) of the insulating substrate 10.

  On the upper surface of the insulating substrate 10, an organic resin film such as an acrylic resin is covered so as to cover portions other than the connection terminals T of the touch detection electrode 11, the linearization pattern 12, the first extraction wiring 13 a and the second extraction wiring 13 b. An insulating layer may be provided. In addition, as this insulating layer, in order to suppress deterioration of the transparent conductive film which consists of ITO, the organic resin film which does not contain carboxylic acid is preferable.

  On the lower surface of the substrate 15a, as shown in FIG. 1, an L-shaped external wiring 16 is connected to each connection terminal T of the first extraction wiring 13a and the second extraction wiring 13b on the insulating substrate 10. Are provided.

  As shown in FIG. 1, the external wiring 16 includes a connection portion 16 a provided so as to overlap the connection terminal T, and a wiring provided so as to bend from the connection portion 16 a and extend in a direction away from the touch detection electrode 11. Part 16b. Here, the external wiring 16 is formed of a copper foil or the like that constitutes the conductive layer of the FPC. The wiring portion 16b may be bent at a position that overlaps the end of the connection terminal T, or may be bent on the outside (outside of the terminal) or the inside (inside of the terminal) by several mm from the position.

  On the lower surface of the substrate 15a, an insulating layer made of an organic resin film is provided so as to cover the wiring portion 16b of each external wiring 16. In addition, as this insulating layer, it is formed with the cover film etc. which comprise FPC.

  In the touch panel 20, as shown in FIG. 1, the display area D that displays an image inside the linearization pattern 12, and the linearization pattern 12, the first lead wiring 13 a, and the second lead out around the display area D. A frame region F in which the wiring 13b is disposed is defined.

  The adhesive layer 25a is, for example, an acrylic resin. By optimizing the refractive index, the reflected light at the interface between the materials caused by the difference in the refractive index between the materials is reduced, and the display quality is improved. Can be improved.

  The liquid crystal display device 40 a configured as described above adjusts the transmittance of light transmitted through the liquid crystal display panel 30 by applying a predetermined voltage to the liquid crystal layer between the active matrix substrate 31 and the counter substrate 32, and the touch panel 20. The image is displayed via

  Further, when the surface of the touch detection electrode 11 is touched via a cover substrate (not shown) or a protective film (not shown), the touch detection electrode 11 is grounded via the capacitance of the human body at the position touched. Thus, a change occurs in the capacitance (resistance value) between each corner (four corners) of the linearization pattern 12 and the touched position (grounding point), and the four corners of the linearization pattern 12 and the grounding point are changed. The position where an embedded IC (integrated circuit) in a position detection circuit (not shown) for detecting the touch position connected to each external wiring 16 based on the change in resistance value between It is configured to calculate and detect.

  Next, an example is given and demonstrated about the manufacturing method of the touch panel 20 of the said structure.

  First, the insulating substrate 10 is prepared and the insulating substrate 10 is cleaned. This cleaning is performed using an organic solvent such as acetone, isopropyl alcohol, methanol, ethanol, or the like. Thereby, organic substances and particulate impurities attached to the insulating substrate 10 are removed.

  Next, after forming, for example, an ITO (Indium Tin Oxide) film as a transparent conductive film on the insulating substrate 11 by sputtering, a pattern is formed by photolithography to form the touch detection electrode 11. In addition, it is preferable to form the touch detection electrode 11 so that the thickness is 200 to 1500 mm. This is because, when the thickness of the touch detection electrode 11 is less than 200 mm, it is difficult to maintain the uniformity of the film pressure in the substrate surface, and when the thickness is more than 1500 mm, the transmittance of the touch detection electrode 11 decreases. This is because the display quality may deteriorate.

  Next, a silver paste is applied on the touch detection electrode 11 and the insulating substrate 10 by using a screen printing method, and the linearization pattern 12 is formed so as to extend along each side of the touch detection electrode 11. At the same time, it is pulled out from each corner of the touch detection electrode 11 (or the four corners of the linearization pattern 12) and along one edge of the insulating substrate 10 along the periphery of the insulating substrate 10 (the right side in FIG. 1). A pair of first extraction wirings 13a and a pair of second extraction wirings 13b are formed so as to be respectively extracted to the regions along ().

  For example, a silicon nitride film (thickness of about 1500 mm) is formed by a CVD (Chemical Vapor Deposition) method so as to cover the touch detection electrode 11, the linearization pattern 12, the first extraction wiring 13a, and the second extraction wiring 13b. After film formation, a pattern is formed by photolithography to form a protective layer.

  The touch panel 20 can be manufactured as described above.

  In the present embodiment described above, the following effects can be obtained.

  In the present embodiment, the pitch P of the linearization pattern 12 (that is, the first linearization pattern 12a) provided along the long side 11a of the touch detection electrode 11 is set to 7.1 mm or less. . Therefore, since the resistance fluctuation difference between the touch detection electrode 11 and the linearization pattern 12 is alleviated, it is possible to reduce the deviation between the detection position and the actually touched position on the touch panel 20. As a result, it is possible to effectively suppress a decrease in position detection accuracy.

  Further, for example, even when the linearization pattern 12 is formed with a metal paste such as a silver paste, it is possible to effectively suppress fluctuations in position detection accuracy without depending on the type of the silver paste. It becomes possible to provide the touch panel 20 having high reliability.

  In particular, by setting the above-described pitch P to 4.9 mm or less, the resistance fluctuation difference between the touch detection electrode 11 and the linearization pattern 12 is further alleviated. It is possible to further reduce the deviation from the set position, and as a result, it is possible to more effectively suppress a decrease in position detection accuracy.

  In the present embodiment, the width of the first segment 40 and the second segment 41 constituting the linearization pattern 12 is set to 200 μm or more, and the distance between the first segment 40 and the second segment 41 is set to 200 μm. The configuration is as described above. Therefore, the resistance fluctuation difference between the touch detection electrode 11 and the linearization pattern 12 is further alleviated. As a result, the deviation between the detected position and the actually touched position on the touch panel 20 can be further reduced, so that it is possible to more effectively suppress a decrease in position detection accuracy.

  In the present embodiment, the linearization pattern 12 is formed of a metal paste or an organic conductive film. Therefore, it is possible to form a linearization pattern at a low temperature on a plastic substrate formed of a resin as well as a high heat resistant insulating substrate. Further, the roll-to-roll method makes it possible to produce a large amount continuously by making the unwinding portion and the winding portion of the long substrate relatively compact, thereby improving the productivity. Further, for example, a linearization pattern can be directly formed on a resin cover that can be molded into a lightweight and three-dimensional shape or a liquid crystal display panel substrate after liquid crystal injection at a low temperature of 130 ° or less, for example. It becomes possible.

  In the present embodiment, the metal paste and the organic conductive film for forming the linearization pattern 12 are formed by screen printing. Therefore, the linearization pattern 12 can be easily formed as compared with other manufacturing methods such as a vacuum film forming method.

  Moreover, in this embodiment, it is set as the structure which uses a silver paste as a metal paste which forms the linearization pattern 12. FIG. Compared to other metal pastes, the silver paste has a relatively stable adhesive strength reliability with a transparent conductive film made of ITO, an organic conductive material, or the like that forms the touch detection electrode 11, and fluctuations in interface resistance are also caused. It is relatively small and has high reliability.

  Below, this invention is demonstrated based on an Example and a comparative example. In addition, this invention is not limited to these Examples, These Examples can be changed and changed based on the meaning of this invention, and they are excluded from the scope of the present invention. is not.

Example 1
<Production of touch panel>
First, as an insulating substrate, a glass substrate (length: 76.5 mm, width: 63.5 mm, thickness: 0.3 mm) is prepared, and ITO (manufactured by Geomatic Co., Ltd.) is sputtered on the glass substrate. After forming the film by the method, the touch detection electrode was formed on the glass substrate by patterning into a rectangular shape by photolithography. Next, a silver paste (manufactured by Taiyo Ink Co., Ltd., trade name AF4820) is printed in a predetermined pattern on the touch detection electrode by a screen printer, and then heated at 120 ° C. for 60 minutes using a thermostatic bath. Then, a linearization pattern composed of the first segment and the second segment was formed. For screen printing, a screen plate of SUS300 mesh was used. Moreover, the pitch of the linearization pattern provided along the long side of the touch detection electrode was formed at 4.9 mm. In addition, the width of the first segment and the second segment was formed at 100 μm, the interval between the first segment and the second segment was formed at 150 μm, and the linear number was 11.

<Measurement of position detection accuracy>
First, on the surface of the touch detection electrode, fixed coordinates of 5 rows and 5 columns at equal intervals in the vertical direction and the horizontal direction were set. Next, with a jig device having a pen shape, the surface of the touch detection electrode is touched, and the distance between the position detected by the position detection circuit and the position actually touched by the jig device (hereinafter referred to as “initial”). And calculating the ratio (%) of the amount of deviation with respect to the length of the diagonal line based on the length of the diagonal line of the touch position detection area (that is, the display area). The detection accuracy was measured. In addition, when the ratio of the deviation amount is less than 20%, the position detection accuracy is good.

<Heat and humidity resistance evaluation>
In addition, as a heat and humidity test, after leaving the touch panel in a constant temperature and humidity chamber set at a temperature of 65 ° C. and a humidity of 90% for 240 hours, the touch panel is taken out of the constant temperature and humidity chamber, and again as described above. Similarly, the distance between the position detected by the position detection circuit and the position actually touched by the jig device is calculated as a displacement amount (hereinafter referred to as “a displacement amount after 240 hours”), and the position detection accuracy is improved. Measurements were made.

  In addition, the width of the first segment and the second segment and the interval between the first segment and the second segment are changed (the width is 150 μm and the interval is 150 μm, the width is 200 μm and the interval is 200 μm, In addition, a linearization pattern having a width of 300 μm and an interval of 300 μm was formed, and the position detection accuracy was measured in the same manner, and heat resistance / humidity evaluation was performed. The results are shown in Table 1.

(Example 2)
A touch panel was manufactured in the same manner as in Example 1 except that the linearization pattern provided along the long side of the touch detection electrode was formed with a pitch of 7.1 mm and the linear number was set to 7. . Thereafter, the position detection accuracy was measured under the same conditions as in Example 1 above, and heat resistance / humidity evaluation was performed. The results are shown in Table 2.

(Example 3)
A touch panel was obtained in the same manner as in Example 1 except that silver paste (trade name TR63916, manufactured by Taiyo Ink Co., Ltd.) was used instead of silver paste (trade name AF4820, manufactured by Taiyo Ink Co., Ltd.). Was made. Thereafter, the position detection accuracy was measured under the same conditions as in Example 1 above, and heat resistance / humidity evaluation was performed. The results are shown in Table 3.

Example 4
A touch panel was obtained in the same manner as in Example 2 except that a silver paste (trade name TR63916, manufactured by Taiyo Ink Co., Ltd.) was used instead of the silver paste (trade name AF4820, manufactured by Taiyo Ink Co., Ltd.). Was made. Thereafter, the position detection accuracy was measured under the same conditions as in Example 1 above, and heat resistance / humidity evaluation was performed. The results are shown in Table 4.

(Example 5)
The touch panel was used in the same manner as in Example 1 except that silver paste (manufactured by Toyobo Co., Ltd., product name DW260H) was used instead of silver paste (manufactured by Taiyo Ink Co., Ltd., product name AF4820). Produced. Thereafter, the position detection accuracy was measured under the same conditions as in Example 1 above, and heat resistance / humidity evaluation was performed. The results are shown in Table 5.

(Example 6)
The touch panel was used in the same manner as in Example 2 except that silver paste (manufactured by Toyobo Co., Ltd., trade name DW260H) was used instead of silver paste (trade name AF4820, manufactured by Taiyo Ink Co., Ltd.). Produced. Thereafter, the position detection accuracy was measured under the same conditions as in Example 1 above, and heat resistance / humidity evaluation was performed. The results are shown in Table 6.

(Example 7)
A touch panel is obtained in the same manner as in Example 1 except that a silver paste (trade name XA3251 manufactured by Fujikura Kasei Co., Ltd.) is used instead of the silver paste (trade name AF4820 manufactured by Taiyo Ink Co., Ltd.). Was made. Thereafter, the position detection accuracy was measured under the same conditions as in Example 1 above, and heat resistance / humidity evaluation was performed. The results are shown in Table 7.

(Example 8)
A touch panel is obtained in the same manner as in Example 2 except that a silver paste (trade name XA3251 manufactured by Fujikura Kasei Co., Ltd.) is used instead of the silver paste (trade name AF4820 manufactured by Taiyo Ink Co., Ltd.). Was made. Thereafter, the position detection accuracy was measured under the same conditions as in Example 1 above, and heat resistance / humidity evaluation was performed. Table 8 shows the above results.

(Comparative Example 1)
A touch panel was produced in the same manner as in Example 1 except that the pitch of the linearization pattern provided along the long side of the touch detection electrode was 12.8 mm and the number of linears was 3. . Thereafter, the position detection accuracy was measured under the same conditions as in Example 1 above, and heat resistance / humidity evaluation was performed. The above results are shown in Table 9.

(Comparative Example 2)
A touch panel was produced in the same manner as in Example 3 except that the pitch of the linearization pattern provided along the long side of the touch detection electrode was 12.8 mm and the number of linears was set to 3. . Thereafter, the position detection accuracy was measured under the same conditions as in Example 1 above, and heat resistance / humidity evaluation was performed. Table 10 shows the above results.

(Comparative Example 3)
A touch panel was manufactured in the same manner as in Example 5 except that the pitch of the linearization pattern provided along the long side of the touch detection electrode was 12.8 mm and the linear number was set to 3. . Thereafter, the position detection accuracy was measured under the same conditions as in Example 1 above, and heat resistance / humidity evaluation was performed. Table 11 shows the above results.

(Comparative Example 4)
A touch panel was manufactured in the same manner as in Example 7 except that the linearization pattern provided along the long side of the touch detection electrode had a pitch of 12.8 mm and the linear number was set to 3. . Thereafter, the position detection accuracy was measured under the same conditions as in Example 1 above, and heat resistance / humidity evaluation was performed. The results are shown in Table 12.

  As shown in Tables 1-8, in any case of Examples 1-8, the initial shift amount and the shift amount after 240 hours are less than 20%, and the detected position and the actual touch on the touch panel are touched. It can be seen that the deviation from the position is small, and the decrease in position detection accuracy can be effectively suppressed. Moreover, it turns out that the fluctuation | variation of a position detection precision can be suppressed effectively, without being dependent on the kind of silver paste. In particular, when the width of the first segment and the second segment is 200 μm or more and the distance between the first segment and the second segment is 200 μm or more, the overall deviation amount after 240 hours is further reduced. It can be seen that a decrease in position detection accuracy can be more effectively suppressed.

  On the other hand, as shown in Tables 9 to 12, in any case of Comparative Examples 1 to 4, the initial deviation amount is less than 20%, but the deviation amount after 240 hours is 20% or more. It can be seen that there is a large gap between the detected position and the actually touched position on the touch panel.

  In addition, you may change the said embodiment as follows.

  In the above embodiment, the TFT type liquid crystal display device is exemplified as the display device. However, the present invention is a liquid crystal display device such as a DUTY type or a polysilicon type, an organic EL (electroluminescence) display device, a plasma display device, The present invention can also be applied to other display devices such as electronic paper.

  The present invention also provides an electronic apparatus (for example, a television, a personal computer, a mobile phone, a digital camera, a display device having a display panel such as the above-described liquid crystal display panel 30 and the above-described touch panel 20 provided on the display panel. The present invention can also be applied to portable game machines, electronic photo frames, PDAs (Peraonal Digital Assistants), electronic books, microwave ovens and washing machines having touch switches. With such a configuration, it is possible to provide an electronic device including a touch panel that can effectively suppress a decrease in position detection accuracy.

  The touch panel 20 of the present invention can also be applied to an electronic device that does not have a display panel such as the liquid crystal display panel 30 described above. More specifically, the present invention can also be applied to electronic devices including the above-described touch panel 20 (for example, various remote controls, electric toothbrushes, shavers, microwave ovens, washing machines, household appliances such as vacuum cleaners, and game controllers). With such a configuration, it is possible to provide an electronic device including a touch panel that can effectively suppress a decrease in position detection accuracy. Further, since it can be formed on a resin substrate or the like and can be incorporated in a cover or a display device, the electronic device can be reduced in weight and size.

  In the above embodiment, the insulating substrate 10 side of the touch panel 20 is attached to the liquid crystal display panel 30. However, like the liquid crystal display device 40b shown in FIG. 8, the touch panel 20 is interposed via the adhesive layer 25b. It is good also as a structure which affixes the touch detection electrode 11 side to the liquid crystal display panel 30, and functions the insulating board | substrate 10 of the touch panel 20 as a cover board | substrate which protects a display screen (touch surface). Further, the insulating substrate 10 of the touch panel 20 may be configured by the counter substrate 32 of the liquid crystal display panel 30 as in the liquid crystal display device 40c shown in FIG. 9 includes a cover substrate 9 provided on the touch panel 20 via an adhesive layer 25c, and polarizing plates 33a and 33b attached to the upper and lower surfaces of the liquid crystal display panel 30, respectively. I have. With such a configuration, the liquid crystal display device can be thinned and reflected light can be reduced to improve display quality.

  As described above, the present invention relates to a touch panel, and is particularly useful for a capacitive touch panel and a display device including the same.

DESCRIPTION OF SYMBOLS 10 Insulating board | substrate 11 Touch detection electrode 12 Linearization pattern 12a 1st linearization pattern 12b 2nd linearization pattern 20 Touch panel 30 Liquid crystal display panel 31 Active matrix substrate 32 Opposite substrate 40 1st segment 40a Liquid crystal display device 40b Liquid crystal Display device 40c Liquid crystal display device 41 Second segment P Pitch of first linearization pattern S Distance between first segment and second segment W Width of first segment and second segment

Claims (8)

An insulating substrate;
A touch detection electrode provided in a rectangular shape on the insulating substrate;
On the touch detection electrode, a capacitive touch panel provided with a linearization pattern provided along each side of the touch detection electrode,
The touch panel, wherein a pitch of the linearization pattern provided along the long side of the touch detection electrode is 7.1 mm or less.   The touch panel as set forth in claim 1, wherein the pitch is 4.9 mm or less. The linearization pattern includes a first segment and a second segment arranged adjacent to the first segment,
3. The width of the first segment and the second segment is 200 μm or more, and an interval between the first segment and the second segment is 200 μm or more. 4. Touch panel.   The touch panel according to any one of claims 1 to 3, wherein the linearization pattern is formed of a metal paste or an organic conductive film.   The touch panel according to claim 4, wherein the metal paste and the organic conductive film are formed by a screen printing method.   The touch panel according to claim 4 or 5, wherein the metal paste is a silver paste. A display panel;
A display device comprising: the touch panel according to claim 1 provided on the display panel.   The display device according to claim 7, wherein the display panel is a liquid crystal display panel.

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