TW201905666A - Electrode plate for projected capacitive touch device - Google Patents

Abstract

An electrode plate for a projection capacitive touch device comprises a light-transmissive substrate with a window region and an edge region, and a conductive layer. The conductive layer includes: a sensing region extending in the first direction and having a sensing region formed in the window region, and a sensing electrode unit connecting the sensing region and formed in the routing region of the edge region; a driving electrode unit spaced apart from the sensing electrode unit and having a plurality of the driving electrodes arranged at intervals along the first direction; and the dummy (virtual) electrode units which are disposed between the sensing electrode unit and the driving electrode unit and formed in the window region. Each of the driving electrodes has the driving region formed in the window region, and a routing region extending from a side of the driving region away from the sensing region toward the edge region to the edge region. The dummy electrode unit has a plurality of dummy electrodes arranged at intervals along the first direction and having an area that decreases gradually from the edge region toward the window region.

Description

Electrode plate for projected capacitive touch device

The present invention relates to an electrode plate for a capacitive touch device, in particular to an electrode plate for a projected capacitive touch device.

The projected capacitive touch device has the characteristics of good operation stability, multi-touch support, light and thinness, etc., so it is widely integrated into a flat display such as a liquid crystal display to become a touch display. Generally speaking, the main components of the projected capacitive touch device include a transparent substrate and a patterned transparent electrode layer formed on the transparent substrate; wherein the transparent electrode layer has a sensing electrode and a driving electrode spaced apart from each other . However, due to optical effects, there is an optical etching line between the sensing electrode and the driving electrode, which seriously affects the appearance and visual effect of the terminal application device. In order to solve the aforementioned problems caused by the optically etched texture, a dummy electrode is generally disposed between the sensing electrode and the driving electrode to reduce the problem of poor visual appearance caused by the optically etched texture.

1 and 2, a conventional electrode plate 1 for a projected capacitive touch device includes a glass substrate 11 and a patterned conductive layer 12 formed on the glass substrate 11. The glass substrate 11 has a window area 111 and an edge area 112 adjacent to the window area 111. The patterned conductive layer 12 has a sensing electrode 121, a plurality of driving electrodes 122 spaced apart from the sensing electrode 121, and a dummy electrode 123 disposed between the sensing electrode 121 and the driving electrodes 122.

The sensing electrode 121 has a sensing area 1211 formed in the window area 111, and a trace area 1212 extending from the sensing area 1211 toward the edge area 112 to be formed in the edge area 112. The driving electrodes 122 are spaced from the window region 111 toward the edge region 112, and each driving electrode 122 has a driving region 1221 formed in the window region 111, and a driving electrode 1221 away from the sensing electrode The 121 side extends toward the edge area 112 to terminate at the trace area 1222 of the edge area 112. The dummy electrode 123 has a plurality of electrode regions 1231 spaced apart from the window region 111 toward the edge region 112.

The projected capacitive touch device determines the touch coordinates by detecting the amount of capacitance change between the driving electrode and the sensing electrode. However, as shown in FIGS. 1 and 2, the length of the trace area 1222 of the driving electrode 122 away from the edge area 112 is relatively greater than the length of the trace area 1222 of the drive electrode 122 adjacent to the edge area 112, and each drive A capacitance is also formed between the trace area 1222 of the electrode 122 and the sense area 1211 of the sense electrode 121. Therefore, the actual capacitance value between the driving region 1221 of the driving electrode 122 and the sensing region 1211 of the sensing electrode 121 is further away from the edge region 112. This results in uneven capacitance distribution of the electrode plate 1 of the conventional projected capacitive touch device, so that the accuracy when applied to a display screen decreases.

From the above description, it can be seen that the problem of improving the uneven distribution of the capacitance of the electrode plate used in the projected capacitive touch device is a subject to be broken by those skilled in the art.

Therefore, an object of the present invention is to provide an electrode plate for a projected capacitive touch device with uniformly distributed capacitance values.

Therefore, the electrode plate of the present invention for a projected capacitive touch device includes a transparent substrate and a conductive layer. The transparent substrate includes a window area, and an edge area adjacent to the window area. The conductive layer includes at least one sensing electrode unit, at least one driving electrode unit, and at least one dummy electrode unit. The sensing electrode unit extends along a first direction, and has a sensing area formed on the window area, and a wiring area connected to the sensing area and formed on the edge area. The driving electrode unit and the sensing electrode unit are spaced apart, and have a plurality of driving electrodes spaced apart from each other along the first direction. Each driving electrode has a driving area formed on the window area, and a wiring area connected to the corresponding driving area, and the wiring area of each driving electrode is from the side away from the sensing area toward the edge The zone extends to terminate at the edge zone. The dummy electrode unit is spaced between the sensing electrode unit and the driving electrode unit and formed on the window area, and has a plurality of dummy electrodes arranged spaced apart from each other along the first direction. In the present invention, the areas of the dummy electrodes decrease from the edge area toward the window area.

The effect of the present invention is to decrease the area of the virtual electrodes from the edge area toward the window area, so that the capacitance of the sensing area of the sensing electrode unit and the driving area of the driving electrodes is from the edge area toward the The window area decreases, so that the capacitance values caused by the wiring areas of the driving electrodes and the sensing area of the sensing electrode unit are averaged from the edge area toward the window area.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same number.

Referring to FIGS. 3 and 4, a first embodiment of an electrode plate for a projected capacitive touch device of the present invention includes a transparent substrate 2 and a conductive layer 3.

The transparent substrate 2 includes a window area 21 and an edge area 22 adjacent to the window area 21.

The conductive layer 3 includes at least one sensing electrode unit 31, at least one driving electrode unit 32, and at least one dummy electrode unit 33. In the first embodiment of the present invention, the number of the sensing electrode unit 31, the driving electrode unit 32 and the dummy electrode unit 33 is described as an example. It should be understood that the number of the aforementioned electrode units of the present invention is It is not limited to this first embodiment.

The sensing electrode unit 31 extends along a first direction Y, and has a sensing area 311 formed on the window area 21 and a wiring area 312 connected to the sensing area 311 and formed on the edge area 22.

The driving electrode unit 32 is spaced apart from the sensing electrode unit 31 and has a plurality of driving electrodes 321 arranged at intervals in the first direction Y. Each driving electrode 321 extends along the first direction Y and has a driving area 3211 formed on the window area 21, and a wiring area 3212 connected to the corresponding driving area 3211, and the driving The line area 3212 extends from the side away from the sensing area 311 toward the edge area 22 to terminate at the edge area 22.

The dummy electrode unit 33 is spaced between the sensing electrode unit 31 and the driving electrode unit 32, is formed on the window area 21, and has a plurality of dummy electrodes 331 spaced apart from each other along the first direction Y; wherein The area of the dummy electrodes 331 decreases from the edge area 22 toward the window area 21. As shown in FIG. 4, in the first embodiment of the present invention, each dummy electrode 331 has a plurality of electrode regions 3311, and the number of electrode regions 3311 of the dummy electrodes 331 is equal to each other, and within a single dummy electrode 331 The areas of the electrode regions 3311 are substantially equal.

The first embodiment of the present invention mainly uses the virtual electrodes 331 in a decreasing relationship from the edge area 22 toward the window area 21, so that the sensing area 311 of the sensing electrode unit 31 and the driving electrodes 321 The capacitance between the driving regions 3211 decreases from the edge region 22 toward the window region 21, so that the sensing region 311 and the routing regions 3212 of the driving electrodes 321 increase from the edge region 22 toward the window region 21 The capacitor is worth repairing and achieving a uniform effect. Therefore, the touch accuracy of the first embodiment of the present invention when applied to a display screen can be improved.

5 and 6, a second embodiment of the electrode plate of the present invention for a projected capacitive touch device is substantially the same as the first embodiment, the difference is that the virtual electrodes 331 The number of electrode regions 3311 decreases from the edge region 22 toward the window region 21, and the areas of the electrode regions 3311 in a single dummy electrode 331 are substantially equal.

When the second embodiment of the present invention is applied to a display screen, the accuracy of its touch coordinates (ie, the detected capacitance value) can be decreased due to the area from the edge region 22 toward the window region 21 In addition to the improvement of the virtual electrodes 331, the number of the electrode regions 3311 in each virtual electrode 331 that decreases from the edge region 22 toward the window region 21 can further reduce the problem of poor appearance caused by etching lines To improve the appearance of the touch screen.

In summary, the electrode plate of the present invention for the projected capacitive touch device uses the virtual electrodes 331 whose area decreases from the edge area 22 toward the window area 21 to make the sensing area of the sensing electrode unit 31 The capacitance between 311 and the driving region 3211 of the driving electrodes 321 decreases from the edge region 22 toward the window region 21, thus causing the sensing region 311 and the routing region 3212 of the driving electrodes 321 from the edge region 22 The capacitance increasing toward the window area 21 is worth to be revised down and achieve a uniform effect, so that its touch accuracy when applied to the display screen can be improved, so it can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention, and the scope of implementation of the present invention cannot be limited by this, any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still classified as Within the scope of the invention patent.

2‧‧‧Transparent substrate

321‧‧‧Drive electrode

21‧‧‧Window area

3211‧‧‧Drive area

22‧‧‧ Marginal zone

3212‧‧‧Training area

3‧‧‧conductive layer

33‧‧‧Virtual electrode unit

31‧‧‧Induction electrode unit

331‧‧‧Virtual electrode

311‧‧‧sensing area

3311‧‧‧electrode area

312‧‧‧route area

Y‧‧‧First direction

32‧‧‧Drive electrode unit

Other features and functions of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: FIG. 1 is a partial schematic top view illustrating an existing electrode plate for a projected capacitive touch device; FIG. 2 1 is a partially enlarged schematic view of FIG. 1; FIG. 3 is a partial top schematic view illustrating a first embodiment of an electrode plate for a projected capacitive touch device of the present invention; FIG. 4 is a partially enlarged schematic view of FIG. 3; FIG. 5 is A partial top schematic view illustrating a second embodiment of the electrode plate of the present invention for a projected capacitive touch device; and FIG. 6 is a partially enlarged schematic view of FIG. 5.

Claims (5)

An electrode plate for a projected capacitive touch device, comprising: a light-transmitting substrate, including a window area and an edge area adjacent to the window area; and a conductive layer, including: at least one sensing electrode unit, along A first direction extends, and has a sensing area formed on the window area, and a wiring area connected to the sensing area and formed on the edge area, at least one driving electrode unit is spaced apart from the sensing electrode unit And has a plurality of drive electrodes arranged at intervals in the first direction, each drive electrode has a drive area formed on the window area, and a wiring area connected to the corresponding drive area, each drive electrode The trace area extends from the side away from the sensing area toward the edge area to terminate in the edge area, and at least one dummy electrode unit is spaced between the sensing electrode unit and the driving electrode unit and formed in the On the window area, and there are a plurality of dummy electrodes arranged at intervals in the first direction; wherein the areas of the dummy electrodes are from the edge area toward the window Decremented. The electrode plate for a projected capacitive touch device according to claim 1, wherein each virtual electrode has a plurality of electrode areas, and the number of electrode areas of the virtual electrodes is equal to each other. The electrode plate for a projected capacitive touch device according to claim 2, wherein the areas of the electrode regions in a single virtual electrode are substantially equal. The electrode plate for a projected capacitive touch device according to claim 1, wherein each virtual electrode has a plurality of electrode areas, and the number of electrode areas of the virtual electrodes decreases from the edge area toward the area window . The electrode plate for a projected capacitive touch device according to claim 4, wherein the areas of the electrode regions in a single virtual electrode are substantially equal.