TWI621987B - Electrode plate for projected capacitive touch device - Google Patents

Abstract

An electrode plate for a projected 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 wiring region connecting the sensing region and formed in the edge region, spaced apart from the sensing electrode unit and having a plurality of intervals along the first direction The driving electrode unit of the driving electrode and the dummy electrode unit which are disposed between the sensing electrode unit and the driving electrode unit and formed in the window region. Each of the driving electrodes is formed in a driving region of the window region, and extends from a side of the driving region away from the sensing region toward the edge region to a routing region of the edge region. The dummy electrode unit has a plurality of dummy electrodes arranged at intervals in the first direction and having an area that decreases 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, and more particularly to an electrode plate for a projected capacitive touch device.

The projected capacitive touch device has the characteristics of good operation stability, multi-touch control and thinness, and is widely integrated into a flat panel display such as a liquid crystal display to become a touch display. In general, the main constituent elements 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 sensing electrodes and driving electrodes spaced apart from each other . However, due to optical effects, there is an optical etch pattern between the sensing electrode and the driving electrode, which seriously affects the visual appearance of the terminal application device. In order to solve the problem caused by the optical etching trace, a dummy electrode is generally disposed between the sensing electrode and the driving electrode to reduce the problem of poor visual appearance due to optical etching.

Referring to FIG. 1 and FIG. 2 , a conventional electrode plate 1 for a projected capacitive touch device includes a glass substrate 11 and a pattern formed on the glass substrate 11 . Conductive layer 12. The glass substrate 11 has a window region 111 and an edge region 112 adjacent to the window region 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 spaced apart from the sensing electrode 121 and the driving electrodes 122.

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

Based on the projected capacitive touch device, the touch coordinates are determined by detecting the amount of change in capacitance between the drive electrode and the sense electrode. However, as shown in FIG. 1 and FIG. 2, the length of the routing region 1222 away from the driving electrode 122 of the edge region 112 is relatively larger than the length of the routing region 1222 adjacent to the driving electrode 122 of the edge region 112, and each driving A capacitance is also formed between the wiring region 1222 of the electrode 122 and the sensing region 1211 of the sensing 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 the capacitance distribution of the electrode plate 1 for the conventional projected capacitive touch device. So, the accuracy is reduced when applied to the display screen.

As can be seen from the above description, the problem of improving the uneven distribution of the capacitance of the electrode plates for the projected capacitive touch device is a subject to be solved by those skilled in the art.

Accordingly, it is an object of the present invention to provide an electrode plate for a projected capacitive touch device that has a uniform distribution of capacitance values.

Therefore, the electrode plate of the present invention for a projected capacitive touch device comprises a light transmissive substrate and a conductive layer. The light transmissive substrate includes a window region and an edge region adjacent to the window region. 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 in 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 is spaced apart from the sensing electrode unit and has a plurality of driving electrodes spaced apart from each other along the first direction. Each of the driving electrodes has a driving region formed on the window region, and a wiring region connected to the corresponding driving region, and the driving region of each driving electrode is from a side far from the sensing region toward the edge The zone extends to terminate in the edge zone. The dummy electrode unit is disposed between the sensing electrode unit and the driving electrode unit and formed on the window region, and has a plurality of virtual spaces arranged along the first direction electrode. In the present invention, the area of the dummy electrodes is decremented from the edge region toward the window region.

The effect of the present invention is that the area of the dummy electrodes is decreased from the edge region toward the window region, so that the capacitance value of the sensing region of the sensing electrode unit and the driving segment of the driving electrodes is from the edge region toward the edge region. The window area is decremented such that the capacitance values of the sensing regions of the driving electrodes and the sensing interval of the sensing electrode unit are averaged from the edge region toward the window region.

2‧‧‧Transparent substrate

21‧‧‧Window area

22‧‧‧Edge area

3‧‧‧ Conductive layer

31‧‧‧Sensor electrode unit

311‧‧‧ Sensing area

312‧‧‧Drop area

32‧‧‧Drive electrode unit

321‧‧‧ drive electrode

3211‧‧‧ Drive Area

3212‧‧‧Drop area

33‧‧‧Virtual electrode unit

331‧‧‧Virtual electrode

3311‧‧‧electrode zone

Y‧‧‧First direction

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a partial top view showing a conventional electrode plate for a projected capacitive touch device; FIG. 3 is a partially enlarged plan view showing a first embodiment of an electrode plate for a projected capacitive touch device according to the present invention; FIG. 4 is a partially enlarged schematic view of FIG. 3; A partial top view of a second embodiment of an electrode plate for a projected capacitive touch device of the present invention; and FIG. 6 is a partial enlarged view of FIG.

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

Referring to FIG. 3 and FIG. 4, a first embodiment of an electrode plate for a projected capacitive touch device of the present invention comprises a light transmissive substrate 2 and a conductive layer 3.

The light transmissive substrate 2 includes a window region 21 and an edge region 22 adjacent to the window region 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 by taking one example as an example. It should be noted that the number of the foregoing 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 routing 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 spaced apart from each other along the first direction Y. Each driving electrode 321 extends along the first direction Y and has a driving region 3211 formed on the window region 21, and a routing region 3212 connected to the corresponding driving region 3211, and each The routing area 3212 of the drive electrode 321 extends from the side remote from the sensing area 311 toward the edge area 22 to terminate in the edge area 22.

The dummy electrode unit 33 is disposed between the sensing electrode unit 31 and the driving electrode unit 32, and is formed on the window region 21, and has a plurality of dummy electrodes 331 arranged along the first direction Y; The area of the dummy electrodes 331 is decreasing from the edge region 22 toward the window region 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 are equal to each other, and a single dummy electrode 331 is included. The areas of the electrode regions 3311 are substantially equal.

The first embodiment of the present invention mainly utilizes the dummy electrodes 331 in a decreasing relationship from the edge region 22 toward the area of the window region 21, so that the sensing region 311 of the sensing electrode unit 31 and the driving electrodes 321 are The capacitance value between the driving regions 3211 is decremented from the edge region 22 toward the window region 21, thereby increasing the distance between the sensing region 311 and the routing region 3212 of the driving electrodes 321 from the edge region 22 toward the window region 21. The capacitor is worth being repaired and achieves a uniform effect. Therefore, the first embodiment of the present invention can be improved in touch accuracy when applied to a display screen.

Referring to FIG. 5 and FIG. 6, a second embodiment of an electrode plate for a projected capacitive touch device of the present invention is substantially the same as the first embodiment, except that the dummy electrodes 331 are The number of electrode regions 3311 is decreasing from the edge region 22 toward the window region 21, and the area of the electrode regions 3311 in a single dummy electrode 331 is Substantially equal.

When the second embodiment of the present invention is applied to a display screen, the accuracy of the touch coordinates (ie, the detected capacitance value) may be decremented by the area from the edge region 22 toward the window region 21. The electrode electrodes 3311 in the dummy electrodes 331 which are decremented from the edge region 22 toward the window region 21 can reduce the problem of poor appearance caused by etching lines. To improve the appearance of the touch screen.

In summary, the present invention is applied to an electrode plate of a projected capacitive touch device, and the dummy electrodes 331 are decremented from the edge region 22 toward the area of the window region 21 to cause the sensing region of the sensing electrode unit 31. The capacitance between 311 and the driving region 3211 of the driving electrodes 321 is decremented from the edge region 22 toward the window region 21, so that the sensing region 311 and the routing region 3212 of the driving electrodes 321 are from the edge region. 22 The capacitance increasing toward the window area 21 is worth to be repaired and achieves a uniform effect, so that the touch accuracy when applied to the display screen is improved, so that the object of the present invention can be achieved.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the simple equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still Within the scope of the invention patent.

Claims (5)

An electrode plate for a projected capacitive touch device, comprising: a light transmissive substrate comprising a window region and an edge region adjacent to the window region; and a conductive layer comprising: at least one sensing electrode unit along a first direction extending, and having a sensing area formed on the window area, and a wiring area connecting the sensing area and formed on the edge area, at least one driving electrode unit is spaced apart from the sensing electrode unit And having a plurality of driving electrodes arranged along the first direction, each driving electrode has a driving region formed on the window region, and a wiring region connected to the corresponding driving region, each driving electrode The wiring area is extended from the side far from the sensing area toward the edge area to terminate in the edge area, and at least one dummy electrode unit is disposed between the sensing electrode unit and the driving electrode unit and formed at the a plurality of virtual electrodes arranged along the first direction; wherein the area of the dummy electrodes is from the edge area toward the window area . The electrode plate for a projected capacitive touch device according to claim 1, wherein each of the dummy electrodes has a plurality of electrode regions, and the number of electrode regions of the dummy electrodes is equal to each other. The electrode plate for a projected capacitive touch device according to claim 2, wherein an area of the electrode regions in a single dummy electrode is substantially equal. The electrode plate for a projected capacitive touch device according to claim 1, wherein each of the dummy electrodes has a plurality of electrode regions, and the number of electrode regions of the dummy electrodes is decreased from the edge region toward the window region. . The electrode plate for a projected capacitive touch device according to claim 4, wherein an area of the electrode regions in a single dummy electrode is substantially equal.