TWI674454B - Touch panel - Google Patents

Abstract

An object of the present invention is to provide a touch panel capable of suppressing the generation of moire and suppressing the phenomenon in which a pattern of a transparent electrode can be observed. The touch panel 21 of the present invention includes: a substrate 27; and a transparent electrode 28, which is formed on the substrate 27 and has another transparent electrode adjacent to the substrate 27 as the opposite side, that is, the edge portion 31 and 32. Therefore, the edge portions 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 occurrence of moiré and the phenomenon in which the pattern of the transparent electrode 28 can be observed can be suppressed.

Description

Touch panel

The invention relates to a touch panel.

An electrostatic capacitance type touch panel capable of detecting the position of a finger based on a change in electrostatic capacitance is known from the past (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 attached to a cover layer 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 layer 3 and the surface of the glass sensor 5. In addition, the functional film 2 may not be attached to the surface of the cover layer 3 and the surface of the glass sensor 5. FIG. 2 is a schematic configuration diagram of the glass sensor 5 of FIG. 1. A transparent electrode 8 is formed on the substrate 7. The transparent electrode 8 includes 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 showing an example of a color filter substrate mounted on a liquid crystal display (LCD). The color filter substrate 10 includes a color filter 11 including 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. The length in the X direction of the color filter 11 indicates the short axis, and the length in the Y direction of the color filter 11 indicates the long axis. The black matrix 12 is disposed between adjacent color filters 11 in the Y direction, and is extended in the X direction. [Prior Art Literature] [Patent Literature] [Patent Literature 1] US Patent Application Publication No. 2015/0035790 Specification [Patent Literature 2] US Patent Application Publication No. 2010/0295813

[Problems to be Solved by the Invention] When the touch panel of FIG. 1 is set on an LCD and the LCD is turned on, there are edges of the color filter 11 or the black matrix 12 and the transparent electrode 8 of the LCD. In the case of moiré. This moire is significant when the axis of the color filter 11 (the “long axis” in the case of FIG. 3) or the black matrix 12 disposed between adjacent color filters 11 is aligned parallel to the edge of the transparent electrode 8. Ground. In particular, in a case where the functional film 2 is an anti-reflection film, moire is more prominently generated due to transmitted light from the LCD. In addition, when the LCD is not lit, a phenomenon in which the ITO skeleton can be observed (that is, a phenomenon in which the pattern of the transparent electrode 8 can be observed) may occur. An object of the present invention is to provide a touch panel capable of suppressing the generation of moire and suppressing the phenomenon that a pattern of a transparent electrode can be observed. [Technical means to solve the problem] In order to achieve the above-mentioned object, the touch panel disclosed in the specification is characterized by having: a substrate; and a transparent electrode formed on the substrate and having another adjacent to the foregoing substrate. A transparent electrode is an opposite non-linear side, that is, a first non-linear portion. [Effects of the Invention] According to the present invention, it is possible to suppress the occurrence of moire and to suppress a phenomenon in which a pattern of a transparent electrode is observed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 4 is a cross-sectional view of a touch panel according to an embodiment of the present invention. The touch panel 21 is an electrostatic capacitance type touch panel and includes: a functional film 22, a cover layer 23 (for example, a glass plate), a transparent adhesive material 24, a glass sensor 25, and a flexible printed circuit board (FPC) 26. The cover layer 23 is adhered to the glass sensor 25 via a transparent adhesive material 24. The FPC 26 is disposed between the cover layer 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 layer 23 and the lower surface of the glass sensor 25. In addition, the functional film 22 may not be stuck on the upper surface of the cover layer 23 and the lower surface of the glass sensor 25. FIG. 5 (A) is a schematic configuration diagram of the glass sensor of FIG. 4. FIG. Fig. 5 (B) is a sectional view taken along the line A-A in Fig. 5 (A). FIG. 5 (C) is a diagram showing an example of the refraction state of light. As shown in FIG. 5 (A), a transparent electrode 28 is formed on the substrate 27. The transparent electrode 28 includes a conductive film (such as an ITO (Indium Tin Oxide, Indium Tin Oxide) film), and is formed into a shape as shown in FIG. 5 (A) 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 this embodiment, as shown in FIG. 5 (A), the edge of the transparent electrode 28 is set in a zigzag shape. Thus, when the touch panel 21 is set on the LCD, the edge of the transparent electrode 28 is not parallel to the long axis of the color filter 11 built into the LCD or the black matrix 12 shown in FIG. 3, and the transparent electrode 8 The edge can have a certain angle (acute angle) with respect to the long axis of the color filter 11, and can suppress the occurrence of moire and the phenomenon that the pattern of the transparent electrode 28 can be observed. As shown in FIG. 5 (B), 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 125 Ω / □. The substrate 27 and the transparent electrode 28 are covered by 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. In addition, 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, 43 Ω / □. Therefore, the thickness b of the transparent electrode 28 is thinner than that of the transparent electrode 8 of the glass sensor 5 of FIG. 2. Thus, the reason for reducing the thickness b of the transparent electrode 28 will be described below. In the portion where the transparent electrode 28 is arranged and the portion where it is not arranged, the hue is different and the light transmittance is different. For example, as shown in FIG. 5 (B), the transmittance Ta of light at a portion where the transparent electrode 28 is disposed is smaller than the transmittance Tb of light at a portion where the transparent electrode 28 is not disposed. Moreover, as shown in FIG. 5 (C), the refractive index of light is different between the portion where the transparent electrode 28 is arranged and the portion where it is not arranged. Therefore, in the glass sensor 25, the boundary portion (edge) between the portion where the transparent electrode 28 is arranged and the portion where it is not arranged is seen like a line, and moire is generated. Therefore, in the present embodiment, since the thickness of the transparent electrode 28 is reduced, the transparent electrode 28 becomes more transparent. Therefore, it is possible to suppress a change in the hue of the portion where the transparent electrode 28 is disposed and the portion where the transparent electrode 28 is disposed. In addition, since the thickness of the transparent electrode 28 is reduced to reduce the distance through which light passes through the transparent electrode 28, the deformation of the light can be suppressed, and the boundary portion cannot be easily recognized by the operator. The thickness b of the transparent electrode 28 in this embodiment is 23 nm, but the thickness b of the transparent electrode 28 is preferably 15 nm or more and 30 nm or less. This is because the moire is significantly generated when the thickness b of the transparent electrode 28 exceeds 30 nm, and if the thickness b of the transparent electrode 28 is set to less than 15 nm, the surface resistance of the transparent electrode 28 changes If it is too high, the touch panel 21 cannot operate normally. FIG. 6 (A) is a diagram showing the shape of the transparent electrode 28. FIG. FIG. 6 (B) is an enlarged view of a region X of an edge portion of the transparent electrode 28. FIG. 6 (C) is an enlarged view of a region Y of an edge portion of the transparent electrode 28. FIG. FIG. 6 (D) is a diagram showing a first modified example of the edge portion of the transparent electrode 28. FIG. 6 (E) is a diagram showing a second modified example of the edge portion of the transparent electrode 28. FIG. 6 (F) is a diagram showing a third modified example of the edge portion of the transparent electrode 28. FIG. 6 (G) is a diagram showing a fourth modified example of the edge portion of the transparent electrode 28. FIG. 6 (H) is a diagram showing a fifth modified example of the edge portion of the transparent electrode 28. The edge portions 31 and 32 of the transparent electrode 28 in FIG. 6 (A) may have a zigzag shape that is continuously bent in a straight line, as shown in FIGS. 6 (B) and 6 (C), or may be as shown in FIG. 6 (D) Shown is a continuous wave shape. 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. 6 (E), the edge portion 31 may have a wave 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. 6 (F). The edge portions 31 and 32 are not limited to a regular wave shape, but may be irregular wave shapes as shown in FIG. 6 (G). Further, the edge portions 31 and 32 may have a shape combining a zigzag shape and a wave shape as shown in FIG. 6 (H). The angles θ1 to θ4 (see FIGS. 6 (B) and 6 (C)) 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 the angles θ1 to θ4 of the edge portions 31 and 32 are closer to 0 degrees and are approximately parallel to the long axis of the color filter 11, which causes moiré, and the angles θ1 to 31 of the edge portions 31 and 32 The closer θ4 is to 90 degrees, the more parallel it is to the black matrix 12, and moiré may occur. The angles θ1 to θ4 may be the same as each other or may be different from each other. In addition, if the sawtooth of the edge portions 31 and 32 is too small compared to the color filter 11, the effect of moire suppression is reduced. Therefore, the length d1 to d4 of one side of the sawtooth of the edge portions 31 and 32 is preferably a color filter. The length of the long axis of the device 11 is greater than. In addition, the lengths d1 to d4 of one side of the sawtooth may be the same as each other or different from each other. FIG. 7 (A) is a diagram showing a first modification example of the arrangement pattern of the transparent electrodes 28. As shown in FIG. 7, a pattern 33 or 34 that is electrically insulated from the transparent electrode 28 and has the same optical characteristics (for example, refractive index and transmittance) as the transparent electrode 28 may be arranged between adjacent transparent electrodes 28. . The pattern 33 has an edge portion 35 having a zigzag shape or a wave shape opposite to the edge portion 31 of the transparent electrode 28. The pattern 34 has an edge portion 36 having a zigzag shape or a wave shape opposite to the edge portion 32 of the transparent electrode 28. The patterns 33 and 34 are not connected to the FPC 26. In this way, since the pattern 33 or 34 having a zigzag or wave-shaped edge portion is arranged between adjacent transparent electrodes 28, the light incident on the surface of the touch panel 21 from the outside will not be uniform. Ground reflection is scattering, so the phenomenon in which the transparent electrode 28 and the pattern 33 or 34 can be observed can be further suppressed. FIG. 8 (A) is a sectional view of a modified example of the touch panel. FIG. 8 (B) is a diagram showing the structure of the upper substrate, and FIG. 8 (C) is a diagram showing the structure of the lower substrate. FIG. 8 (D) is a diagram showing a modification example of the configuration of the upper substrate, and FIG. 8 (E) is a diagram showing a modification example of the configuration of the lower substrate. The touch panel 41 in FIG. 8 (A) is a resistive film type touch panel. The touch panel 41 includes: an upper substrate 42 including a PET (Polyethylene terephthalate) film; an upper conductive film (such as an ITO film) 43 formed on the upper substrate 42; an adhesive 44; The dot spacer 45; the lower substrate 46 including glass; and a lower conductive film (for example, an ITO film) 47 formed on the lower substrate 46. The outer periphery of the upper substrate 42 and the outer periphery of the lower substrate 46 are fixed via an adhesive 44. As shown in FIG. 8 (B), the long side of the upper conductive film 43 may be provided with a zigzag-shaped edge portion 50. As shown in FIG. 8 (C), the long side of the lower conductive film 47 may be provided with an edge portion 51 having a zigzag shape. As with the angles θ1 to θ4, the angles of the edge portions 50 and 51 with respect to the long axis of the color filter 11 of the LCD or the black matrix 12 are preferably 30 degrees to 60 degrees. As with the lengths d1 to d4 of the one side, the length of one of the serrations of the edge portions 50 and 51 is preferably the length of the long axis of the color filter 11 or more. As in FIG. 6 (D), the serrations of the edge portions 50 and 51 may have a wave shape having rounded corners. The edge portions 50 and 51 function as first non-linear portions. In addition, as shown in FIG. 8 (D), the upper conductive film 43 may be disposed between adjacent upper conductive films 43 and electrically insulated from the upper conductive film 43 and have the same optical characteristics as the upper conductive film 43 (such as refractive index and transmission).率 等) 的 设计 52。 Pattern 52. The pattern 52 has an edge portion 53 having a zigzag shape or a wave shape opposite to the edge portion 50 of the upper conductive film 43. In addition, as shown in FIG. 8 (E), the lower conductive film 47 may be disposed between adjacent lower conductive films 47 and has the same optical characteristics as the lower conductive film 47 (e.g., refractive index and transmission).率 等) 的 设计 54。 54 pattern. The pattern 54 has an edge portion 55 having a zigzag shape or a wave shape opposite to the edge portion 51 of the lower conductive film 47. The edge portions 53 and 54 function as a third non-linear portion. FIG. 9 (A) is a diagram showing a second modification example of the arrangement pattern of the transparent electrodes 28. FIG. 9 (B) is an enlarged view of a region Z of an edge portion of the transparent electrode 28. FIG. 9 (C) is a diagram showing an example of the shape of a pattern arranged between the transparent electrodes 28. As shown in FIG. 9 (A) and FIG. 9 (B), the transparent electrodes 28 may be disposed between adjacent transparent electrodes 28 (that is, between the edge portions 31 or the edge portions 32) and electrically insulated from the transparent electrodes 28 and The transparent electrode 28 has a pattern 60 having the same optical characteristics (for example, refractive index and transmittance). In addition, in the case where the edge portions 31 and 32 are jagged, the angle of the edge portions 31 and 32 with respect to the long axis of the color filter 11 of the LCD or the black matrix 12 is preferably 30 degrees to 60 degrees. As shown in FIG. 9 (C), the shape of the pattern 60 is a square, a rhombus, a circle, an ellipse, or a combination of straight lines and curves. In this way, by arranging the pattern 60 between adjacent transparent electrodes 28, the light incident from the outside onto the surface of the touch panel 21 is not uniformly reflected but scattered, so it is possible to further suppress observability To the transparent electrode 28 and the pattern 60. As described above, according to this embodiment, since the transparent electrode 28 has non-straight edges, ie, sawtooth-shaped or wave-shaped edge portions 31 and 32, which are opposite to another adjacent transparent electrode, the transparent electrode 28 has The edge portions 31 and 32 are not parallel to the long axis or the black matrix 12 of the color filter 11 built into the LCD shown in FIG. 3, and can suppress the occurrence of moire and the phenomenon in which the pattern of the transparent electrode 28 can be observed. In addition, since the upper conductive film 43 and the lower conductive film 47 of the touch panel 41 also have edge portions 50 and 51 of a zigzag shape or a wave shape, respectively, it is possible to suppress the occurrence of moiré and to suppress the observation of the upper conductive film 43 and Phenomenon of the pattern of the lower conductive film 47. In addition, the present invention is not limited to the above-mentioned embodiment, and various changes can be implemented without departing from the gist thereof.

1‧‧‧ touch panel

2‧‧‧ functional film

3‧‧‧ cap

4‧‧‧ transparent adhesive material

5‧‧‧ glass sensor

6‧‧‧flexible printed circuit board / FPC

7‧‧‧ substrate

8‧‧‧ transparent electrode

9‧‧‧ Wiring

10‧‧‧ color filter substrate

11‧‧‧ Color Filter

12‧‧‧ Black Matrix

21‧‧‧Touch Panel

22‧‧‧functional film

23‧‧‧ cap

24‧‧‧ transparent adhesive material

25‧‧‧ glass sensor

26‧‧‧Flexible Printed Circuit Board / FPC

27‧‧‧ substrate

28‧‧‧ transparent electrode

29‧‧‧ Wiring

30‧‧‧ Insulation

31‧‧‧Edge

32‧‧‧Edge

33‧‧‧ pattern

34‧‧‧ pattern

35‧‧‧Edge

36‧‧‧Edge

41‧‧‧Touch Panel

42‧‧‧upper base

43‧‧‧upper conductive film

44‧‧‧ Adhesive

45‧‧‧point spacer

46‧‧‧Lower base plate

47‧‧‧Lower conductive film

50‧‧‧Edge

51‧‧‧Edge

52‧‧‧ pattern

53‧‧‧Edge

54‧‧‧ pattern

55‧‧‧Edge

60‧‧‧ pattern

a‧‧‧thickness

b‧‧‧ thickness

c‧‧‧thickness

d1‧‧‧ length

d2‧‧‧length

d3‧‧‧ length

d4‧‧‧ length

Ta‧‧‧Transmittance

Tb‧‧‧Transmittance

X‧‧‧ area

Y‧‧‧area

Z‧‧‧ area

θ1‧‧‧ angle

θ2‧‧‧ angle

θ3‧‧‧ angle

θ4‧‧‧ angle

FIG. 1 is a cross-sectional view of a conventional capacitive touch panel. FIG. 2 is a schematic configuration diagram of the glass sensor of FIG. 1. FIG. FIG. 3 is a diagram showing an example of a color filter substrate mounted on a liquid crystal display (LCD). FIG. 4 is a cross-sectional view of a touch panel according to an embodiment of the present invention. Fig. 5 (A) is a schematic configuration diagram of the glass sensor of Fig. 4; Fig. 5 (B) is a cross-sectional view taken along the line AA of Fig. 5 (A); and Fig. 5 (C) is a diagram showing an example of the refracted state of light . Fig. 6 (A) is a diagram showing the shape of a transparent electrode; Fig. 6 (B) is an enlarged view of an area X of an edge portion of the transparent electrode; and Fig. 6 (C) is an enlarged view of an area Y of an edge portion of the transparent electrode; FIG. 6 (D) is a diagram showing a first modification of the edge portion of the transparent electrode; FIG. 6 (E) is a diagram showing a second modification of the edge portion of the transparent electrode; FIG. 6 (F) is a diagram showing the transparent electrode 28 FIG. 6 (G) is a diagram showing a fourth modification of the edge portion of the transparent electrode 28; FIG. 6 (H) is a diagram showing a fifth modification of the edge portion of the transparent electrode 28 FIG. 7 is a diagram showing a first modification example of the arrangement pattern of the transparent electrodes. Fig. 8 (A) is a sectional view of a modification example of the touch panel; Fig. 8 (B) is a diagram showing the structure of the upper substrate; Fig. 8 (C) is a diagram showing the structure of the lower substrate; and Fig. 8 (D) is a diagram showing FIG. 8 (E) is a diagram showing a modification example of the structure of the lower substrate. FIG. 9 (A) is a diagram showing a second modification example of the arrangement pattern of the transparent electrodes; FIG. 9 (B) is an enlarged view of an area Z of the edge portion of the transparent electrode; and FIG. 9 (C) is a diagram showing the arrangement between the transparent electrodes Illustration of the shape of the pattern.

Claims (10)

A touch panel, comprising: a substrate; and a transparent electrode formed on the substrate and having a first non-linear line with a non-linear side opposite to another transparent electrode on the substrate In the case where the first non-linear portion is a zigzag portion that is continuously bent in a straight line, 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 Above 30 degrees and below 60 degrees. For example, the touch panel of claim 1, wherein a length of one side of the aforementioned sawtooth portion is greater than a length of a long axis of the aforementioned color filter. A touch panel, comprising: a substrate; and a transparent electrode formed on the substrate and having a first non-linear line with a non-linear side opposite to another transparent electrode adjacent to the substrate on the substrate. And the pattern is not connected to the flexible printed circuit board, and the pattern is arranged between the transparent electrode and the other transparent electrode, is electrically insulated from the transparent electrode and the other transparent electrode, and is electrically separated from the foregoing The transparent electrode and the aforementioned another transparent electrode have equivalent optical characteristics. The touch panel of claim 3, wherein the pattern has a third non-linear portion, and the third non-linear portion is a non-linear side opposite to the transparent electrode and the other transparent electrode. For example, the touch panel of claim 3, wherein the first non-straight line portion is a continuous wave portion. The touch panel as claimed in claim 5, wherein the aforementioned waveform portion has an irregular waveform shape. For example, the touch panel of claim 3, wherein the first non-linear portion is an irregular sawtooth portion. The touch panel according to claim 3, wherein the transparent electrode includes a second non-linear portion, which faces the first non-linear portion, and has a shape different from the first non-linear portion. The touch panel according to claim 3, wherein the first non-linear portion has a shape combining a zigzag shape and a wave shape. For example, the touch panel of any one of claims 1, 3, 5, 7, 8, and 9, wherein the aforementioned touch panel is disposed on a display device having a color filter.