JP2018049557A - Touch panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a touch panel capable of suppressing the occurrence of moire and the phenomenon of seeing a pattern of transparent electrodes. SOLUTION: A touch panel 21 is a transparent electrode 28 formed on a substrate 27 and having edge portions 31 and 32 which are sides facing other adjacent transparent electrodes on the substrate 27. It includes an electrode 28. Therefore, the edges 31 and 32 of the transparent electrode 28 are not parallel to the long axis or the black matrix of the color filter built in the LCD, and the phenomenon of moire and the appearance of the pattern of the transparent electrode 28 can be suppressed. it can. [Selection diagram] Fig. 5

Description

  The present invention relates to a touch panel.

  Conventionally, a capacitive touch panel that can detect the position of a finger based on a change in capacitance is known (see, for example, Patent Documents 1 and 2).

  FIG. 1 is a cross-sectional view of a conventional capacitive touch panel. In the touch panel 1, a glass sensor 5 is bonded to a cover lay 3 (for example, a glass plate) with a transparent adhesive material 4. A functional film 2 such as an anti-reflection film is bonded to the surface of the cover lay 3 and the surface of the glass sensor 5. The functional film 2 may not be attached to the surface of the cover lay 3 and the surface of the glass sensor 5.

  FIG. 2 is a schematic configuration diagram of the glass sensor 5 of FIG. A transparent electrode 8 is formed on the substrate 7. The transparent electrode 8 is made of a conductive film (for example, an ITO (Indium Tin Oxide) film). The transparent electrode 8 is connected to a flexible printed circuit board (FPC) 6 via a wiring 9.

  FIG. 3 is a diagram illustrating an example of a color filter substrate mounted on a liquid crystal display (LCD). The color filter substrate 10 includes a color filter 11 composed of three colors of red (R), green (G), and blue (B), and a black matrix 12 that blocks unnecessary light. The color filter 11 of each color has a rectangular shape, and the length of the color filter 11 in the X direction indicates the minor axis, and the length of the color filter 11 in the Y direction indicates the major axis. The black matrix 12 is disposed between adjacent color filters 11 in the Y direction and extends in the X direction.

US Patent Application Publication No. 2015/0035790 US Patent Application Publication No. 2010/0295813

  When the touch panel of FIG. 1 is installed on the LCD and the LCD is turned on, moire may occur due to the color filter 11 or black matrix 12 of the LCD and the edge of the transparent electrode 8. This moire is conspicuous when the axis of the color filter 11 (“long axis” in the case of FIG. 3) or the black matrix 12 arranged between the adjacent color filters 11 is arranged in parallel with the edge of the transparent electrode 8. . In particular, when the functional film 2 is an anti-reflection film, moiré is more noticeably generated by the transmitted light from the LCD. Further, when the LCD is not lit, an ITO bone appearance phenomenon (that is, a phenomenon in which the pattern of the transparent electrode 8 can be seen) may occur.

  An object of the present invention is to provide a touch panel that can suppress the occurrence of moiré and the appearance of a transparent electrode pattern.

  In order to achieve the above object, a touch panel disclosed in the specification is a substrate and a transparent electrode formed on the substrate, and is a non-linear side facing another adjacent transparent electrode on the substrate. And a transparent electrode having a first non-linear portion.

  According to the present invention, it is possible to suppress the occurrence of moiré and the phenomenon of visible transparent electrode patterns.

It is sectional drawing of the conventional capacitive touch panel. It is a schematic block diagram of the glass sensor of FIG. It is a figure which shows an example of the color filter board | substrate mounted in a liquid crystal display (LCD). It is sectional drawing of the touchscreen which concerns on embodiment of this invention. (A) is a schematic block diagram of the glass sensor of FIG. (B) is sectional drawing of the AA line of FIG. 5 (A). (C) is a figure which shows the example of the refraction state of light. (A) is a figure which shows the shape of a transparent electrode. (B) is an enlarged view of the region X of the edge portion of the transparent electrode. (C) is an enlarged view of the region Y of the edge portion of the transparent electrode. (D) is a figure which shows the 1st modification of the edge part of a transparent electrode. (E) is a figure which shows the 2nd modification of the edge part of a transparent electrode. FIG. 8F is a diagram illustrating a third modification of the edge portion of the transparent electrode 28. (G) is a diagram showing a fourth modification of the edge portion of the transparent electrode 28. (H) is a diagram showing a fifth modification of the edge portion of the transparent electrode 28. It is a figure which shows the 1st modification of the arrangement pattern of a transparent electrode. (A) is sectional drawing of the modification of a touchscreen. (B) is a figure which shows the structure of an upper board | substrate. (C) is a figure which shows the structure of a lower board | substrate. (D) is a figure which shows the modification of a structure of an upper board | substrate. (E) is a figure which shows the modification of a structure of a lower board | substrate. (A) is a figure which shows the 2nd modification of the arrangement pattern of a transparent electrode. (B) is an enlarged view of the region Z of the edge portion of the transparent electrode. (C) is a figure which shows the example of the shape of the pattern arrange | positioned between transparent electrodes.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 4 is a cross-sectional view of the touch panel according to the embodiment of the present invention.

  The touch panel 21 is a capacitive touch panel, and includes a functional film 22, a cover lay 23 (for example, a glass plate), a transparent adhesive 24, a glass sensor 25, and a flexible printed circuit board (FPC) 26. The coverlay 23 is bonded to the glass sensor 25 via a transparent adhesive material 24. The FPC 26 is provided between the cover lay 23 and the glass sensor 25. A functional film 22 such as an anti-reflection film is bonded to the upper surface of the cover lay 23 and the lower surface of the glass sensor 25. The functional film 22 may not be attached to the upper surface of the cover lay 23 and the lower surface of the glass sensor 25.

  FIG. 5A is a schematic configuration diagram of the glass sensor 25 of FIG. FIG. 5B is a cross-sectional view taken along line AA in FIG. FIG. 5C is a diagram illustrating an example of a light refraction state.

  As shown in FIG. 5A, a transparent electrode 28 is formed on the substrate 27. The transparent electrode 28 is made of a conductive film (for example, an ITO (Indium Tin Oxide) film), and is formed in the shape of FIG. 5A by etching the conductive film on the substrate 27. The transparent electrode 28 is connected to a flexible printed circuit board (FPC) 26 via a wiring 29.

  In the present embodiment, the edge of the transparent electrode 28 is formed in a zigzag shape as shown in FIG. Thereby, when the touch panel 21 is installed on the LCD, the edge of the transparent electrode 28 is not parallel to the long axis of the color filter 11 or the black matrix 12 built in the LCD shown in FIG. This edge can have a certain angle (acute angle) with respect to the long axis of the color filter 11, and the occurrence of moire and the phenomenon of the transparent electrode 28 pattern being visible can be suppressed.

  As shown in FIG. 5B, the substrate 27 is, for example, a glass plate, the refractive index of the substrate 27 is 1.4, and the thickness c of the substrate 27 is 0.7 mm. The refractive index of the transparent electrode 28 is 1.8, the thickness b of the transparent electrode 28 is 23 nm, and the surface resistance of the transparent electrode 28 is 125Ω / □. The substrate 27 and the transparent electrode 28 are covered with an insulating layer 30, the refractive index of the insulating layer 30 is 1.5, and the thickness a of the insulating layer 30 is 2 μm. The thickness of the transparent electrode 8 of the glass sensor 5 of FIG. 2 is, for example, 46.6 nm, and the surface resistance of the transparent electrode 8 is, for example, 43Ω / □.

  Therefore, the thickness b of the transparent electrode 28 is made thinner than the thickness of the transparent electrode 8 of the glass sensor 5 of FIG. The reason why the thickness b of the transparent electrode 28 is thus reduced will be described below.

  The place where the transparent electrode 28 is arranged is different from the place where the transparent electrode 28 is not arranged, and the light transmittance is different. For example, as shown in FIG. 5B, the light transmittance Ta where the transparent electrode 28 is disposed is smaller than the light transmittance Tb where the transparent electrode 28 is not disposed. Further, the refractive index of light differs between the place where the transparent electrode 28 is arranged and the place where the transparent electrode 28 is not arranged, as shown in FIG.

  For this reason, in the glass sensor 25, the boundary (edge) between the place where the transparent electrode 28 is arranged and the place where the transparent electrode 28 is not arranged looks like a line, and moire occurs.

  Therefore, in the present embodiment, since the transparent electrode 28 becomes more transparent by reducing the thickness of the transparent electrode 28, the color change between the place where the transparent electrode 28 is arranged and the place where it is not arranged Can be suppressed. Further, by reducing the thickness of the transparent electrode 28, the distance of light passing through the transparent electrode 28 is reduced, so that light distortion can be suppressed and it is difficult for the operator to recognize the boundary portion.

  Although the thickness b of the transparent electrode 28 of the present embodiment is 23 nm, the thickness b of the transparent electrode 28 is desirably 15 nm or more and 30 nm or less. This is because when the thickness b of the transparent electrode 28 exceeds 30 nm, moire is remarkably generated. When the thickness b of the transparent electrode 28 is less than 15 nm, the surface resistance of the transparent electrode 28 becomes too high, and the touch panel 21 This is because will not work properly.

  FIG. 6A is a diagram showing the shape of the transparent electrode 28. FIG. 6B is an enlarged view of the region X at the edge portion of the transparent electrode 28. FIG. 6C is an enlarged view of the region Y at the edge portion of the transparent electrode 28. FIG. 6D is a diagram illustrating a first modification of the edge portion of the transparent electrode 28. FIG. 6E is a diagram illustrating a second modification of the edge portion of the transparent electrode 28. FIG. 6F is a diagram illustrating a third modification of the edge portion of the transparent electrode 28. FIG. 6G is a diagram illustrating a fourth modification of the edge portion of the transparent electrode 28. FIG. 6H is a diagram illustrating a fifth modification of the edge portion of the transparent electrode 28.

  The edge portions 31 and 32 of the transparent electrode 28 in FIG. 6A may have a zigzag shape in which a straight line is continuously bent as shown in FIGS. 6B and 6C, or FIG. As shown in FIG. 6, the waveform may be a continuous waveform. The edge portions 31 and 32 function as a first non-linear portion and a second non-linear portion. The shape of the edge portion 31 and the shape of the edge portion 32 may be the same or different from each other. For example, as shown in FIG. 6E, the edge portion 31 may have a waveform shape and the edge portion 32 may have a zigzag shape. The edge portions 31 and 32 are not limited to a regular zigzag shape, but may be an irregular zigzag shape as shown in FIG. The edge portions 31 and 32 are not limited to a regular waveform shape, and may have an irregular waveform shape as shown in FIG. Further, the edge portions 31 and 32 may have a combination of a zigzag shape and a waveform shape as shown in FIG.

  The angles θ1 to θ4 (see FIGS. 6B and 6C) of the edge portions 31 and 32 of the transparent electrode 28 with respect to the long axis of the color filter 11 of the LCD are preferably 30 degrees or more and 60 degrees or less. This is because when the angles θ1 to θ4 of the edge portions 31 and 32 approach 0 degrees, they become substantially parallel to the major axis of the color filter 11 and moire occurs, and the angles θ1 to θ4 of the edge portions 31 and 32 are 90 degrees. This is because when it approaches, it becomes substantially parallel to the black matrix 12 and moire occurs. The angles θ1 to θ4 may be the same as each other, but may be different from each other.

  Further, if the zigzag of the edge portions 31 and 32 is too small with respect to the color filter 11, the effect of suppressing moire is reduced. It is desirable that the length be equal to or greater than Note that the lengths d1 to d4 of one side of the zigzag may be the same as each other or may be different from each other.

  FIG. 7 is a view showing a first modification of the arrangement pattern of the transparent electrodes 28.

  As shown in FIG. 7, between adjacent transparent electrodes 28, a pattern 33 that is electrically insulated from the transparent electrode 28 and has optical characteristics (for example, refractive index and transmittance) equivalent to the transparent electrode 28 or 34 may be arranged. The pattern 33 has a zigzag or corrugated edge 35 that faces the edge 31 of the transparent electrode 28. The pattern 34 has a zigzag or corrugated edge 36 that faces the edge 32 of the transparent electrode 28. The patterns 33 and 34 are not connected to the FPC 26. As described above, by arranging the pattern 33 or 34 having the zigzag or corrugated edge portion between the adjacent transparent electrodes 28, the light incident on the surface of the touch panel 21 from the outside is not uniformly reflected. Therefore, the phenomenon in which the transparent electrode 28 and the pattern 33 or 34 are visible can be further suppressed.

  FIG. 8A is a cross-sectional view of a modification of the touch panel. FIG. 8B is a diagram illustrating the configuration of the upper substrate, and FIG. 8C is a diagram illustrating the configuration of the lower substrate. FIG. 8D is a diagram showing a modified example of the configuration of the upper substrate, and FIG. 8E is a diagram showing a modified example of the configuration of the lower substrate.

  The touch panel 41 in FIG. 8A is a resistive film type touch panel. The touch panel 41 includes an upper substrate 42 made of a PET (Polyethylene terephthalate) film, an upper conductive film (for example, ITO film) 43 formed on the upper substrate 42, an adhesive 44, a dot spacer 45, and glass. And a lower conductive film (for example, ITO film) 47 formed on the lower substrate 46. The outer periphery of the upper substrate 42 is fixed to the outer periphery of the lower substrate 46 via an adhesive 44.

  As shown in FIG. 8B, the long side of the upper conductive film 43 may include a zigzag edge portion 50. As shown in FIG. 8C, the long side of the lower conductive film 47 may include a zigzag edge portion 51. Similar to the angles θ1 to θ4, the angles of the edge portions 50 and 51 with respect to the major axis of the color filter 11 of the LCD or the black matrix 12 are preferably 30 degrees to 60 degrees. Similar to the lengths d1 to d4 of the one side, the length of one side of the zigzag of the edge portions 50 and 51 is preferably equal to or longer than the length of the long axis of the color filter 11. Similar to FIG. 6D, the zigzag of the edge portions 50 and 51 may have a rounded waveform. The edge parts 50 and 51 function as a first non-linear part.

  Further, as shown in FIG. 8D, optical characteristics (for example, refractive index and transmission) that are electrically insulated from the upper conductive film 43 and are equivalent to those of the upper conductive film 43 between the adjacent upper conductive films 43. A pattern 52 having a rate) may be arranged. The pattern 52 has a zigzag or corrugated edge 53 that faces the edge 50 of the upper conductive film 43. As shown in FIG. 8E, optical characteristics (for example, refractive index, transmittance, etc.) that are electrically insulated from the lower conductive film 47 and equivalent to the lower conductive film 47 between the adjacent lower conductive films 47. ) May be arranged. The pattern 54 has a zigzag or corrugated edge 55 that faces the edge 51 of the lower conductive film 47. The edge parts 53 and 54 function as a third non-linear part.

  FIG. 9A is a diagram illustrating a second modification of the arrangement pattern of the transparent electrodes 28. FIG. 9B is an enlarged view of the region Z at the edge portion of the transparent electrode 28. FIG. 9C is a diagram illustrating an example of the shape of a pattern disposed between the transparent electrodes 28.

  As shown in FIGS. 9A and 9B, the transparent electrodes 28 are electrically insulated and transparent between adjacent transparent electrodes 28 (that is, between the edge portions 31 or between the edge portions 32). A pattern 60 having the same optical characteristics as the electrode 28 (for example, refractive index and transmittance) may be disposed. When the edge portions 31 and 32 are zigzag, the angle of the edge portions 31 and 32 with respect to the major axis of the color filter 11 of the LCD or the black matrix 12 is preferably 30 to 60 degrees. As shown in FIG. 9C, the shape of the pattern 60 is a square, a rhombus, a circle, an ellipse, or a combination of straight lines and curves. Thus, by arranging the pattern 60 between the adjacent transparent electrodes 28, the light incident on the surface of the touch panel 21 from the outside is not uniformly reflected but scattered, so that the transparent electrode 28 and the pattern 60 are scattered. The visible phenomenon can be further suppressed.

  As described above, in the present embodiment, the transparent electrode 28 has the zigzag-shaped or corrugated edge portions 31 and 32 that are non-linear sides facing other adjacent transparent electrodes. Edge portions 31 and 32 are not parallel to the major axis of the color filter 11 or the black matrix 12 incorporated in the LCD shown in FIG. 3, thereby suppressing the occurrence of moiré and the pattern of the transparent electrode 28 being visible. Can do. Further, the upper conductive film 43 and the lower conductive film 47 of the touch panel 41 also have zigzag or corrugated edge portions 50 and 51, respectively, so that the occurrence of moire and the pattern of the upper conductive film 43 and the lower conductive film 47 can be seen. Phenomenon can be suppressed.

  The present invention is not limited to the above-described embodiment, and can be implemented with various modifications within a range not departing from the gist thereof.

11 Color Filter 12 Black Matrix 21, 41 Touch Panel 22 Functional Film 23 Coverlay 24 Transparent Adhesive Material 25 Glass Sensor 26 Flexible Printed Circuit Board (FPC)
27 Substrate 28 Transparent electrode 31, 32, 50, 51 Edge portion 33, 34, 52, 54 Pattern 42 Upper substrate 43 Upper conductive film 46 Lower substrate 47 Lower conductive film

Claims (8)

A substrate,
A transparent electrode formed on a substrate, comprising: a transparent electrode having a first non-linear portion whose side facing the other transparent electrode adjacent to the substrate is non-linear.   The touch panel as set forth in claim 1, wherein the first non-linear portion is any one of a zigzag portion where a straight line is continuously bent and a waveform portion where a curve is continuous.   When the first non-linear portion is a zigzag portion where the straight line is continuously bent, the angle of the zigzag portion with respect to the color filter or black matrix of the display device disposed under the touch panel is 30 degrees or more and 60 degrees or less. The touch panel according to claim 1, wherein the touch panel is provided.   The touch panel according to claim 3, wherein a length of one side of the zigzag portion is equal to or longer than a length of a long axis of the color filter.   5. The transparent electrode according to claim 1, wherein the transparent electrode includes a second non-linear portion facing the first non-linear portion and having a shape different from that of the first non-linear portion. Touch panel.   A pattern that is disposed between the transparent electrode and the other transparent electrode, is electrically insulated from the transparent electrode and the other transparent electrode, and has optical characteristics equivalent to those of the transparent electrode and the other transparent electrode; The touch panel according to claim 1, comprising: a touch panel.   The touch panel as set forth in claim 6, wherein the pattern includes a third non-linear portion that is a non-linear side facing the transparent electrode and the other transparent electrode. In a touch panel arranged on a display device having a color filter,
A substrate,
A plurality of transparent electrodes formed on the substrate,
At least one of the sides of the transparent electrode is formed in a non-linear shape.

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