TWI398809B - Capacitive touch panel - Google Patents

Description

Capacitive touch panel

The present invention relates to a touch panel, and more particularly to a capacitive touch panel.

1 is a schematic top view of a capacitive touch panel. Referring to FIG. 1 , the capacitive touch panel 100 includes a substrate 110 , a first electrode pattern layer 120 , a second electrode pattern layer 130 , and a The dielectric layer 140, wherein the first electrode pattern layer 120 and the second electrode pattern layer 130 are disposed on the substrate 110, and the first electrode pattern layer 120 and the second electrode pattern layer 130 are respectively composed of a plurality of first electrode patterns 122 and The second electrode patterns 132 are formed.

As shown in FIG. 1 , when the display panel is located under the capacitive touch panel 100 (ie, below the paper surface) and displayed, the light of the display screen is incident from the bottom of the substrate 110 of the capacitive touch panel 100 and penetrates. The capacitive touch panel 100, that is, light passes through the paper surface from below the paper surface. At position A, light passes through the first electrode pattern 122 and the dielectric layer 140; at the position B, light passes through the second electrode pattern 132 and the dielectric layer 140; and at C, the light passes only through the dielectric layer 140.

However, when the light passes through the interface of different materials, physical phenomena such as refraction, reflection, and penetration may occur, and thus the brightness exhibited by the light at different positions is greatly different, and the first electrode pattern 122 and the second electrode are different. A certain gap G must be maintained between the patterns 132. Therefore, the human eye will see uneven brightness, and in particular, the brightness of the position where the gap G is located and the position of the electrode patterns 122, 132 may be significantly different.

The invention provides a capacitive touch panel. The characteristics and arrangement relationship of each film layer in the capacitive touch panel help to improve its optical performance.

The present invention provides a capacitive touch panel including a first substrate and a plurality of first electrode patterns, a plurality of second electrode patterns, and a plurality of pseudo-electrode patterns on the first substrate. The first electrode pattern is serially connected in a first direction into a plurality of first sensing series, and the second electrode pattern is serially connected in a second direction into a plurality of second sensing series, wherein the first direction and the second direction Intersecting, and the second electrode pattern is separated from the first electrode pattern. In a horizontal direction parallel to the first substrate, each of the first electrode patterns is separated from the adjacent one of the second electrode patterns by a gap, and the pseudo electrode pattern is located in the gap. The pseudo electrode pattern, the first electrode pattern, and the second electrode pattern are the same material, and the pseudo electrode pattern electrically insulates the first electrode pattern and the second electrode pattern.

The present invention provides a capacitive touch panel including a first substrate and a second substrate disposed in parallel with each other, and a plurality of first electrode patterns and a plurality of second portions respectively disposed on the surfaces of the first substrate and the second substrate In the electrode pattern, the plurality of first electrode patterns are serially connected in a first direction into a plurality of first sensing series, and the plurality of second electrode patterns are serially connected in a second direction into a plurality of second sensing series. The first direction intersects with the second direction, and each of the second electrode patterns is separated from the first electrode pattern by a gap, and a plurality of pseudo electrode patterns are disposed, and the plurality of pseudo electrode patterns are disposed in the gaps. The pseudo electrode pattern, the first electrode pattern, and the second electrode pattern are the same material, and the pseudo electrode pattern electrically insulates the first electrode pattern and the second electrode pattern, and a dielectric layer is disposed between the first substrate and the second substrate. Electrical layer.

Based on the above, the capacitive touch panel of the present invention has a plurality of pseudo-electrode patterns, wherein the pseudo-electrode patterns are respectively located between adjacent first and second electrode patterns for improving the light transmittance of the capacitive touch panel. Uneven phenomenon.

The above described features and advantages of the present invention will be more apparent from the following description.

In order to explain the spirit of the present invention, the following examples are described, but the present invention is not limited to the following embodiments.

First embodiment

Referring to FIG. 2 and FIG. 3 , the capacitive touch panel 500 of the present embodiment includes a first substrate 510 , a plurality of first electrode patterns 520 , a plurality of second electrode patterns 530 , and a plurality of pseudo electrode patterns 540 . The first electrode pattern 520, the second electrode pattern 530, and the pseudo electrode pattern 540 are, for example, coplanar on the first substrate 510.

In addition, the first electrode pattern 520, the second electrode pattern 530, and the pseudo electrode pattern 540 are made of the same material, such as indium tin oxide (ITO), indium zinc oxide (Indium Zinc Oxide, IZO), etc. And the first substrate 510 may be one of a transparent glass, a color filter or a lens (Lens).

After the first electrode pattern 520, the second electrode pattern 530, and the pseudo electrode pattern 540 are formed on the first substrate 510, a protective layer 550 may be further formed to cover and protect the first and second electrode patterns. 520, 530 and a pseudo electrode pattern 540, wherein the material of the protective layer 550 is selected from a dielectric material that does not conduct electricity.

In this embodiment, the first electrode patterns 520 are serially connected into a plurality of sensing series, and the second electrode patterns 530 are serially connected into another plurality of sensing series, and the first electrode patterns 520 are connected in series. The measurement series intersects the sensing series connected in series with the second electrode pattern 530. In detail, the first electrode pattern 520 is serially connected in the first direction X into a plurality of first sensing series 520S, and The second electrode pattern 530 is serially connected in the second direction Y into a plurality of second sensing series 530S, and the first direction X and the second direction Y intersect each other.

In practice, the capacitive touch panel 500 is provided with a plurality of first connecting lines 520a and a plurality of second connecting lines 530a to form the first and second sensing series 520S, 530S. As shown in FIG. 2, two adjacent first electrode patterns 520 in the same row of the first sensing series 520S in the first direction X can be electrically connected to each other through the arrangement of the first connecting lines 520a, and then connected in series A first sensing series 520S is formed; likewise, two adjacent second electrode patterns 530 of the second sensing series 530S in the same row along the second direction Y are transparent to each other through the arrangement of the second connecting lines 530a Electrically connected, and then connected in series to a second sensing series 530S.

It should be noted that the first connection line 520a and the second connection line 530a are insulated from each other to enable the capacitive touch panel 500 to operate normally. In addition, the line layout of the first connection line 520a and the second connection line 530a may be The first connection line 520a and the second connection line 530a are only used to facilitate the description of the present embodiment, and are not representative of the first connection line 520a and the second connection line 530a. The actual line layout, and the first connection line 520a and the second connection line 530a may be transparent conductive materials such as indium tin oxide (ITO), indium zinc oxide (Indium Zinc Oxide, IZO), or a metal material.

In order to connect the first sensing series 520S and the second sensing series 530S to external circuits (pads, wires, connectors, etc.), a plurality of first conductive lines 522 and a plurality of first conductive lines 522 are usually disposed on the first substrate 510. The second conductive line 532 is electrically connected to the corresponding first sensing series 520S to transmit the voltage signal of the corresponding first sensing series 520S, and the second conductive line 532 is respectively charged. The second sensing series 530S corresponding to the connection is connected to transmit the voltage signal of the corresponding second sensing series 530S.

In this embodiment, the second electrode pattern 530 and the first electrode pattern 520 are separated from each other, wherein each of the first electrode patterns 520 and one of the adjacent second electrode patterns 530 are in a horizontal direction parallel to the first substrate 510. A gap G is separated from each other. When the first electrode pattern 520 and the second electrode pattern 530 are respectively applied with appropriate voltages, a capacitive effect, such as a gap G, can be generated between the first electrode pattern 520 and the second electrode pattern 530. The width is about 100 micrometers (um). Of course, the actual width should be adjusted appropriately according to the requirements of the product, and the invention is not limited.

In this embodiment, the pseudo electrode pattern 540 is located in the gap G and electrically insulated from the first electrode pattern 520 and the second electrode pattern 530, wherein each of the pseudo electrode patterns 540 and its adjacent first in FIG. The second electrode patterns 520 and 530 are separated by a distance d. For example, the distance d may be between 10 micrometers and 30 micrometers. However, the actual distance should be appropriately adjusted according to product requirements or process capability, and the present invention is not limited thereto.

In addition, as shown in FIG. 2, the pseudo electrode patterns 540 of the present embodiment are strip-shaped, wherein each of the pseudo electrode patterns 540 is adjacent to one first electrode pattern 520 and one second electrode pattern 530. In other embodiments, as shown in FIG. 2A, at least portions of the pseudo electrode patterns 540 may be further connected to each other to form a plurality of intersecting electrode patterns.

As can be seen from FIG. 3, when the light L is incident from below the first substrate 510, the light L passing through the position H passes through the first substrate 510 and the first electrode pattern 520 in sequence, and the light L passing through the position I passes through the first step. A substrate 510 and a second electrode pattern 530, and the light L passing through the position J passes through the first substrate 510 and the pseudo electrode pattern 540 in sequence. Since the three electrode patterns of the first electrode pattern 520, the second electrode pattern 530, and the pseudo electrode pattern 540 have the same refractive index, the light L passes through the capacitive touch panel 500a at the position H, the position I, and the position J. The optical effects such as refraction and reflection are substantially equal.

The pseudo electrode pattern 540 of the present embodiment is separated from the first electrode pattern 520 or the second electrode pattern 530 by a distance d, but the width of the distance d is small, so that the human eye cannot detect it. Therefore, the capacitive touch panel 500a A fairly uniform light penetration at each location.

At the same time, the pseudo electrode pattern 540 is a floating conductor pattern, so the capacitive effect between the first electrode pattern 520 and the second electrode pattern 530 is not affected. In other words, the pseudo electrode pattern 540 does not affect the capacitive touch panel 500a. Under the touch function, the optical effect of the capacitive touch panel 500a is improved, and the pseudo electrode pattern 540 is fabricated in the same process step as the first and second electrode patterns 520, 530, so the pseudo electrode pattern 540 does not increase the capacitance. The process burden of the touch panel 500a.

Second embodiment

According to the L1-L1' section line in Fig. 2, the design of the capacitive touch panel can also be as shown in Figs. 4-6. The spirit of the present embodiment is similar to that of the first embodiment, and the main difference between the present embodiment and the first embodiment is that the first electrode pattern in the capacitive touch panel 500b, 500c, 500d of the present embodiment The arrangement of 520 and the second electrode pattern 530 is non-coplanar.

Referring to FIG. 4, the capacitive touch panel 500b of the present embodiment further includes a second substrate 610 and a dielectric layer 640. The dielectric layer 640 is disposed between the first substrate 510 and the second substrate 610. The pattern 520 and the dummy electrode pattern 540 are disposed between the dielectric layer 640 and the first substrate 510 , and the second electrode pattern 530 is disposed between the dielectric layer 640 and the second substrate 610 , that is, the first electrode pattern 520 . The second electrode patterns 530 are disposed on both sides of the dielectric layer 640, respectively. The first substrate 510 or the second substrate 610 may be one of a transparent glass, a color filter or a lens (Lens).

As can be seen from FIG. 4, when the light L is incident from the lower surface of the first substrate 510 and exits the second substrate 610, the light L passing through the position K passes through the first electrode pattern 520 and the dielectric layer 640, and the light L passing through the position M passes through The electric layer 640 and the second electrode pattern 530, and the light L passing through the position N passes through the pseudo electrode pattern 540 and the dielectric layer 640, and due to the three electrode patterns of the first electrode pattern 520, the second electrode pattern 530, and the pseudo electrode pattern 540 The materials are the same and have the same refractive index. Therefore, after the light L passes through the capacitive touch panel 500b, the optical effects of refraction and reflection at each position are substantially equal, so that the capacitive touch panel 600b can provide uniform light. Penetrating properties.

Of course, the embodiment is not limited to this. In the capacitive touch panel 500c illustrated in FIG. 5 , the pseudo electrode pattern 540 is disposed between the second substrate 610 and the dielectric layer 640 . In addition, in the capacitive touch panel 500d illustrated in FIG. 6 , a portion of the pseudo electrode pattern 540 is disposed between the second substrate 610 and the dielectric layer 640 , and another portion of the pseudo electrode pattern 540 is disposed on the first substrate. Between 510 and dielectric layer 640.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100, 500, 500a, 500b, 500c, 500d. . . Capacitive touch panel

110. . . Substrate

510. . . First substrate

610. . . Second substrate

120. . . First electrode pattern layer

122, 520. . . First electrode pattern

130. . . Second electrode pattern layer

132, 530. . . Second electrode pattern

140, 640. . . Dielectric layer

520a. . . First connection line

520S. . . First sensing series

522. . . First conductive line

530a. . . Second connection line

530S. . . Second sensing series

532. . . Second conductive line

540. . . Quasi-electrode pattern

550. . . The protective layer

A, B, C, H, I, J, K, M, N. . . position

d. . . distance

G. . . gap

L. . . Light

L1-L1’. . . Section line

X. . . First direction

Y. . . Second direction

FIG. 1 is a partial top plan view showing a capacitive touch panel.

FIG. 2 and FIG. 2A are schematic partial top views of two capacitive touch panels according to an embodiment of the present invention.

3 is a partial cross-sectional view showing a capacitive touch panel according to a first embodiment of the present invention.

4 to 6 are partial cross-sectional views showing three capacitive touch panels of a second embodiment of the present invention.

500. . . Capacitive touch panel

510. . . Substrate

520. . . First electrode pattern

530. . . Second electrode pattern

520a. . . First connection line

520S. . . First sensing series

522. . . First conductive line

530a. . . Second connection line

530S. . . Second sensing series

532. . . Second conductive line

540. . . Quasi-electrode pattern

d. . . distance

G. . . gap

L1-L1’. . . Section line

X. . . First direction

Y. . . Second direction

Claims (15)

A capacitive touch panel includes: a first substrate; a plurality of first electrode patterns disposed on the surface of the first substrate and serially connected in a first direction into a plurality of first sensing series; a second electrode pattern is disposed on the surface of the first substrate and serially connected in a second direction to form a plurality of second sensing series, the first direction intersecting the second direction, and the second electrode patterns and the The first electrode patterns are separated, and each of the first electrode patterns is separated from an adjacent one of the second electrode patterns by a gap in a horizontal direction parallel to the first substrate; and a plurality of pseudo electrode patterns are disposed on The surface of the first substrate, and the plurality of first electrode patterns and the second electrode patterns are the same material, and the first electrode patterns electrically insulate the first electrodes a pattern and the second electrode patterns. The capacitive touch panel of claim 1, further comprising a plurality of first connecting lines and a plurality of second connecting lines, the first connecting lines staking the first electrode patterns along the first direction The second connecting lines are electrically connected to form the first sensing series and the second sensing series respectively. The capacitive touch panel of claim 2, wherein the first connecting lines and the second connecting lines are one of indium tin oxide, indium zinc oxide or metal material. The capacitive touch panel of claim 1, wherein the pseudo electrode patterns are strips. The capacitive touch panel of claim 1, wherein at least a portion of the pseudo electrode patterns are connected to each other. The capacitive touch panel of claim 1, wherein the first electrode patterns, the second electrode patterns, and the material of the pseudo electrode patterns comprise indium tin oxide or indium zinc oxide. The capacitive touch panel of claim 1, wherein the first substrate is one of a transparent glass, a color filter or a lens. A capacitive touch panel includes: a first substrate; a second substrate, the second substrate is parallel to the first substrate; and a plurality of first electrode patterns are disposed on the surface of the first substrate and along a first The direction is serially connected to the plurality of first sensing series; the plurality of second electrode patterns are disposed on the surface of the second substrate, and are serially connected in a second direction to form a plurality of second sensing series, the first direction And intersecting the second direction, and each of the second electrode patterns and the first electrode pattern are spaced apart from each other to form a gap; a plurality of pseudo-electrode patterns are disposed in the gaps, the pseudo-electrode patterns, the The first electrode pattern and the second electrode patterns are the same material, and the first electrode patterns electrically electrically isolate the first electrode patterns and the second electrode patterns; a dielectric layer is disposed on the first substrate and Between the second substrates. The capacitive touch panel of claim 8, wherein the pseudo electrode patterns are disposed on one of the first substrate or the second substrate surface. The capacitive touch panel of claim 8, wherein a part of the pseudo electrode pattern is disposed on the surface of the first substrate, and another portion of the pseudo electrode pattern is disposed on the surface of the second substrate. The capacitive touch panel of claim 8, further comprising a plurality of first connecting lines and a plurality of second connecting lines, the first connecting lines staking the first electrode patterns along the first direction The second connecting lines are electrically connected to form the first sensing series and the second sensing series respectively. The capacitive touch panel of claim 8, wherein the pseudo electrode patterns are strips. The capacitive touch panel of claim 8, wherein at least a portion of the pseudo electrode patterns are connected to each other. The capacitive touch panel of claim 8, wherein the first electrode patterns, the second electrode patterns, and the material of the pseudo electrode patterns comprise indium tin oxide or indium zinc oxide. The capacitive touch panel of claim 8, wherein the first substrate or the second substrate is one of a transparent glass, a color filter or a lens.