TWI630520B - Touch panel - Google Patents

Abstract

A touch panel comprising a lower layer, an upper layer, a protective layer and a plurality of Sensing unit. The upper layer is disposed on the lower layer. The protective layer is disposed on the upper thin layer. Any of these sensing units includes a first sensing electrode, a second sensing electrode, and a charge locking electrode. The first sensing electrode is disposed in the lower thin layer. The second sensing electrode is disposed in the upper thin layer and at least partially overlaps the first sensing electrode. The charge locking electrode is disposed in the upper thin layer and at least partially overlaps the first sensing electrode. The first sensing electrode, the second sensing electrode, and the charge locking electrode are not in contact with each other. The charge lock electrode is floating or coupled to a fixed voltage.

Description

Touch panel

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

In order to achieve portability, compactness, and user-friendly operation, many information products have been converted from input devices such as traditional keyboards or mice to using touch panels as input devices. Currently, touch panels can be roughly classified into resistive, capacitive, optical, acoustic, and electromagnetic touch panels. Among them, resistive touch panels and capacitive touch panels are the most common products.

Taking a capacitive touch panel as an example, the capacitive touch panel has a plurality of sensing electrodes, a plurality of signal lines, and a controller. When the user does not touch the touch panel, there is an initial value of capacitance between the sensing electrodes. When the user touches the touch panel, the touched sensing electrodes generate a mutual capacitance, thereby changing the original capacitance initial value. At this time, the controller determines the position of the user's touch by discriminating the position of the electrode that changes the capacitance value.

In the case where the user holds the information product, the touch object (for example, the user's finger) is connected to the same reference voltage (ground voltage) together with the information product. therefore, When the user holds the information product, the controller easily recognizes the location touched by the user. In the case that the user does not have a handheld information product, the information product may be in a floating state (or low ground mode), so that the reference voltage of the information product may be different from the touch object (such as a user's finger or The voltage of the stylus). Therefore, when the user does not hold the information product, the controller may not easily recognize the location touched by the user.

The present invention provides a touch panel that can improve touch sensitivity in a non-handheld environment.

A touch panel according to an embodiment of the invention includes a lower thin layer, an upper thin layer, a protective layer, and a plurality of sensing units. The upper layer is disposed on the lower layer. The protective layer is disposed on the upper thin layer. Any of these sensing units includes a first sensing electrode, a second sensing electrode, and a charge locking electrode. The first sensing electrode is disposed in the lower thin layer. The second sensing electrode is disposed in the upper thin layer and at least partially overlaps the first sensing electrode. The charge locking electrode is disposed in the upper thin layer and at least partially overlaps the first sensing electrode. Wherein, the first sensing electrode, the second sensing electrode and the charge locking electrode are not in contact with each other. The charge lock electrode is configured to float or couple to a fixed voltage.

In an embodiment of the invention, the fixed voltage is a ground voltage or a reference voltage having a fixed level.

In an embodiment of the invention, the first sensing electrode is a driving electrode, and the second sensing electrode is a receiving electrode.

In an embodiment of the invention, the first sensing electrode is a receiving electrode, and the second sensing electrode is a driving electrode.

In an embodiment of the invention, the second sensing electrodes are staggered with the first sensing electrodes, and the charge locking electrodes are staggered with the first sensing electrodes.

In an embodiment of the invention, in the same sensing unit of the sensing units, the first sensing electrode comprises two first sensing pads arranged in parallel and one first connecting portion. The shapes of the first sensing pads and the first connecting portions are rectangular. The two short sides of the first connecting portion are electrically connected to the intermediate portions of the long sides of the first sensing pads. The second sensing electrode includes two second sensing pads arranged in parallel and one second connecting portion. The shapes of the second sensing pads and the second connecting portions are rectangular. The two short sides of the second connecting portion are electrically connected to the intermediate portions of the long sides of the second sensing pads. The second connecting portion and the first connecting portion intersect each other.

In an embodiment of the invention, in the same sensing unit, the first connecting portion and the second connecting portion perpendicularly intersect each other, and the first sensing pad and the second sensing pad do not overlap each other.

In an embodiment of the present invention, in the same sensing unit of the sensing unit, the first sensing electrode includes a first sensing pad, a second sensing pad, and a third sensing pad that are all rectangular. a first connecting portion and a second connecting portion. The first sensing pad, the second sensing pad and the third sensing pad are parallel to each other. The two short sides of the first connecting portion are electrically connected to the intermediate portion of the long side of the first sensing pad and the intermediate portion of the first long side of the second sensing pad. The two short sides of the second connecting portion are electrically connected to the intermediate portion of the second long side of the second sensing pad and the intermediate portion of the long side of the third sensing pad. The second sensing electrode includes both moments a fourth sensing pad, a fifth sensing pad, a third connecting portion and a fourth connecting portion. The two short sides of the third connecting portion are electrically connected to the long sides of the fourth sensing pad and the long sides of the fifth sensing pad, respectively. The two short sides of the fourth connecting portion are electrically connected to the long sides of the fourth sensing pad and the long sides of the fifth sensing pad, respectively. The third connection portion and the first connection portion intersect each other. The fourth connection portion and the second connection portion intersect each other.

In an embodiment of the present invention, in the same sensing unit, the first connecting portion and the third connecting portion perpendicularly intersect each other, and the second connecting portion and the fourth connecting portion perpendicularly intersect each other, and the first sensing pad The second sensing pad, the third sensing pad, the fourth sensing pad and the fifth sensing pad do not overlap each other.

In an embodiment of the invention, the touch panel further includes a plurality of signal lines and a controller. The first sensing electrodes and the second sensing electrodes are electrically connected to the controller by the signal lines.

Based on the above, the touch panel of the embodiment of the present invention additionally configures a charge locking electrode (an electrode floating or coupled to a fixed voltage) between the first sensing electrode and the touch object to absorb the first sensing electrode. The capacitance value of the touched object. Therefore, the touch panel of the embodiment can improve the touch sensitivity in a non-handheld environment.

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

100‧‧‧Electronic devices

100, 400, 500‧‧‧ touch panels

130, 430, 530‧‧‧ Sensing unit

132, 432, 532‧‧‧ first sensing electrodes

134, 434, 534‧‧‧ second sensing electrode

136, 436, 536‧‧‧ charge-locked electrodes

200‧‧‧ touches

432a‧‧‧First sensing pad

432b‧‧‧First Connection

434a‧‧‧Second sensing pad

434b‧‧‧Second connection

532a‧‧‧First sensing pad

532b‧‧‧First Connection

532c‧‧‧Second sensing pad

532d‧‧‧Second connection

532e‧‧‧3rd sensing pad

534a‧‧‧3rd connection

534b‧‧‧fourth sensing pad

534c‧‧‧ fifth sensing pad

534d‧‧‧fourth connection

A _B , A _C ‧ ‧ overlapping area

F1‧‧‧Upper layer

F2‧‧‧lower layer

G‧‧‧ protective layer

G1‧‧‧ first gap

G2‧‧‧Second gap

W ₁₃₄ ‧‧‧Width

FIG. 1 is a schematic diagram of a layout structure of a touch panel according to an embodiment of the invention.

FIG. 2 is a schematic diagram showing the capacitance of the touch panel and the touch object in the case where the user holds the information product in which the touch panel is disposed.

FIG. 3 is a schematic diagram showing the capacitance of the touch panel and the touch object in the case where the user does not hold the information product in which the touch panel is disposed.

FIG. 4 is a schematic structural diagram of a touch panel according to another embodiment of the present invention.

FIG. 5 is a schematic structural diagram of a touch panel according to still another embodiment of the present invention.

The term "coupled (or connected)" as used throughout the specification (including the scope of the claims) may be used in any direct or indirect connection. For example, if the first device is described as being coupled (or connected) to the second device, it should be construed that the first device can be directly connected to the second device, or the first device can be A connection means is indirectly connected to the second device. In addition, wherever possible, the elements and/ Elements/components/steps that use the same reference numbers or use the same terms in different embodiments may refer to the related description.

FIG. 1 is a schematic diagram of a layout structure of a touch panel 100 according to an embodiment of the invention. FIG. 2 and FIG. 3 are schematic cross-sectional views illustrating the touch panel illustrated in FIG. 1, FIG. 4 or FIG. Referring to FIG. 1 and FIG. 2 , the Bar type touch panel 100 includes a protective layer G, an upper film layer F1, a lower thin layer F2, and a plurality of sensing units 130. The upper thin layer F1 is disposed on the lower thin layer F2. The protective layer G is disposed on the upper thin layer F1. The material of the protective layer G, the upper thin layer F1 and/or the lower thin layer F2 may be any Non-conductive materials such as glass, plastic or other electrically insulating materials. The protective layer G, the upper thin layer F1 and/or the lower thin layer F2 may be a light transmissive material or an opaque material according to different application requirements.

Any of these sensing units 130 includes a first sensing electrode 132, a second sensing electrode 134, and a charge-locked electrode 136. The material of the first sensing electrode 132, the second sensing electrode 134, and the charge locking electrode 136 may be any conductive material, such as a light-transmissive conductive material such as indium tin oxide (ITO), or an impervious metal. Light conductive material. The first sensing electrode 132 is disposed in the lower thin layer F2. The second sensing electrode 134 is disposed in the upper thin layer F1 and at least partially overlaps the first sensing electrode 132. The charge locking electrode 136 is disposed in the upper thin layer F1 and at least partially overlaps the first sensing electrode 132. The first sensing electrode 132, the second sensing electrode 134, and the charge locking electrode 136 are not in contact with each other.

The first sensing electrode 132 and the second sensing electrode 134 are staggered and insulated from each other. The first sensing electrode 132 and the charge locking electrode 136 are staggered and insulated from each other. In this embodiment, the width L _{132 of the} first sensing electrode 132 may be 4.5 mm (mm), and the width W _{134 of the} second sensing electrode 134 and/or the charge locking electrode 136 may be 1 mm. The first sensing electrode 132 overlaps with the second sensing electrode 134 to have an overlapping area A _B . Specifically, the overlap area A _B = L ₁₃₂ * W ₁₃₄ = 4.5 mm ^{2 here} . The first sensing electrode 132 and the second sensing electrode 134 form a parallel plate capacitance at the overlapping area A _B . According to the parallel plate capacitance formula: capacitance C = ε * A / d, where ε is the dielectric constant of the dielectric layer between the two parallel plates (here, the first sensing electrode 132 and the second sensing electrode 134), A is the overlapping area A _B of the first sensing electrode 132 and the second sensing electrode 134 , and d is the separation distance between the first sensing electrode 132 and the second sensing electrode 134 . When the user does not touch the touch panel 100, the parallel plate capacitance has a first capacitance initial value. The larger the overlap area A _B , the sensing unit 130 has a larger first capacitance initial value.

The charge lock electrode 136 is configured to float or couple to a fixed voltage. For example, but not limited to, in some embodiments, the charge lock electrode 136 can be fixedly coupled to a ground voltage. In other embodiments, the charge lock electrode 136 can be connected to any reference voltage having a fixed level. In other embodiments, the charge lock electrode 136 can be floated, that is, the charge lock electrode 136 is not connected to any conductive material or electrical component. Therefore, the charge lock electrode 136 cannot be a drive electrode or a receive electrode.

The first sensing electrode 132 and the second sensing electrode 134 are electrically connected to a controller (not shown) by different signal lines. According to a non-design requirement, in some embodiments, the first sensing electrode 132 may be a driving electrode (or a Tx electrode), and the second sensing electrode 134 may be a receiving electrode (or an Rx electrode). In other embodiments, the first sensing electrode 132 can be a receiving electrode and the second sensing electrode 134 can be a driving electrode. When a touch object (such as a user's finger or a stylus) touches the sensing array 220 to cause a change in capacitance at the touch (for example, at the sensing unit 130 shown in FIG. 1 ), the touch panel 100 then transmits the signal line. The capacitance change signal outputted by the sensing unit 130 is transmitted to a controller (not shown) to determine the touch position of the touch object.

FIG. 2 is a diagram illustrating the touch panel 100 and the touch object 200 (eg, a user's finger or touch) in the case where the user holds the information product in which the touch panel 100 is disposed. Pen) Schematic diagram of the capacitance. A parallel plate capacitor is formed between the first sensing electrode 132 and the second sensing electrode 134. Another parallel plate capacitance is formed between the first sensing electrode 132 and the charge locking electrode 136. When the touch object 200 touches (or approaches) the touch panel 100, a parasitic capacitance is formed between the first sensing electrode 132 and the touch object 200. Another parasitic capacitance is formed between the second sensing electrode 134 and the touch object 200. In the application scenario shown in Figure 2, the charge lock electrode 136 is fixedly coupled to the ground voltage. In the case where the user holds the information product in which the touch panel 100 is disposed, the touch object 200 and the touch panel 100 use the same ground voltage. When the touch object 200 touches the touch panel 100 to cause a capacitance change at the touch, the touched sensing unit 130 transmits the capacitance change signal to the controller (not shown) through the signal line to determine the use. Touch the location. When the user holds the information product, the controller (not shown) easily recognizes the location touched by the user.

FIG. 3 is a schematic diagram showing the capacitance of the touch panel 100 and the touch object 200 (for example, a user's finger or a stylus pen) when the user does not hold the information product of the touch panel 100. In the case that the user does not hold the information product configured with the touch panel 100, the reference voltage of the touch panel 100 may be in a floating state (or low ground mode, LGND mode), so that the touch The reference voltage of the panel 100 may be different from the voltage of the touch object 200. In this case, the charge locking electrode 136 between the first sensing electrode 132 and the touch object 200 can absorb the capacitance value of the first sensing electrode 132 via the touch object 200, and reduce the first sensing electrode 132 via the touch. The bumper 200 is connected in series to the mutual capacitance path of the second sensing electrode 134. In the application of an ultra-slim protective layer G, the charge locking electrode 136 can Improve the amount of mutual capacitance change, increase the signal-to-noise ratio (SNR), and help reduce the probability of ghost points. Therefore, the touch panel 100 can improve the touch sensitivity in a non-handheld environment.

The characteristics of the touch panel 100 shown in FIG. 1 will be described below using example data. In any event, the implementation of the touch panel 100 should not be limited thereto. Assuming that the dielectric constant of the protective layer G is 7.4, the thickness of the protective layer G is 0.4 mm, and the dielectric constant of the adhesive layer (not shown) between the protective layer G and the upper thin layer F1 is 3.92, and the adhesive layer is The thickness is 0.1 mm, the dielectric constant of the upper thin layer F1 is 3.9, the thickness of the upper thin layer F1 is 0.045 mm, the dielectric constant of the lower thin layer F2 is 3.28, and the thickness of the lower thin layer F2 is 0.05 mm. Here, the first sensing electrode 132 is used as a driving electrode (or Tx electrode), and the second sensing electrode 134 is used as a receiving electrode (or Rx electrode). Table 1 illustrates the capacitance value of the sensing unit 130 when the touch panel 100 has not been touched. Table 1 further illustrates the capacitance value of the sensing unit in the case where the charge locking electrode 136 of the touch panel 100 is removed.

Table 2 illustrates the capacitance value of the sensing unit 130 when the touch object 200 touches the touch panel 100. In the case where the diameter of the touch object 200 is 22 mm (22 phi), And when the user holds the information product configured with the touch panel 100, the mutual capacitance change ΔC of the sensing unit 130 configuring the charge locking electrode 136 is 0.059 pF, and the sensing unit of the charge locking electrode 136 is not disposed. The mutual capacitance change ΔC was 0.045 pF. In the case where the diameter of the touch object 200 is 22 mm (22 phi), and in the case where the user does not hold the information product in which the touch panel 100 is disposed, the mutual capacitance change of the sensing unit 130 configuring the charge lock electrode 136 is Δ. C is -0.08 pF, and the mutual capacitance change ΔC of the sensing unit without the charge-locking electrode 136 is -0.19 pF. In the case where the diameter of the touch object 200 is 7 mm (7 phi), and in the case where the user holds the information product in which the touch panel 100 is disposed, the mutual capacitance change ΔC of the sensing unit 130 configuring the charge lock electrode 136 The mutual capacitance change ΔC of the sensing unit having 0.02 pF without the charge lock electrode 136 is 0.007 pF. In the case where the diameter of the touch object 200 is 7 mm (7 phi), and in the case where the user does not hold the information product in which the touch panel 100 is disposed, the mutual capacitance change of the sensing unit 130 configuring the charge lock electrode 136 is Δ. C is -0.019 pF, and the mutual capacitance change ΔC of the sensing unit without the charge-locking electrode 136 is -0.052 pF.

Table 3 illustrates that when the touch object 200 of 22 phi (22 mm in diameter) touches the center of the touch panel 100 having the charge locking electrode 136, the touch panel 100 The mutual capacitance characteristic values of the different sensing units 130. Table 4 shows the values of the mutual capacitance characteristics of the different sensing units when the 22 phi (22 mm diameter) touch object 200 touches the center of the touch panel 100 where the charge locking electrode 136 is not disposed. Wherein, Rx1, Rx2, Rx3, Rx4, Rx5, Rx6, Rx7, Rx8, Rx9, and Rx10 represent different second sensing electrodes 134, and Tx1, Tx2, Tx3, Tx4, Tx5, Tx6, Tx7, Tx8, Tx9, Tx10 represents a different first sensing electrode 132. As can be seen from Table 3 and Table 4, the mutual capacitance characteristic value of the touch panel 100 having the charge locking electrode 136 (for example, the mutual capacitance characteristic values of the position of the touch object 200 - 50, -40, -42, -38) It is larger than the mutual capacitance characteristic value of the touch panel 100 in which the charge lock electrode 136 is not disposed (for example, the mutual capacitance characteristic values -79, -110, -83, -110 of the position where the touch object 200 is located). It can be seen that the charge locking electrode 136 can improve the amount of mutual capacitance change. Therefore, the touch panel 100 having the charge locking electrode 136 can improve the touch sensitivity in a non-handheld environment.

Table 5 illustrates the values of the mutual capacitance characteristics of the different sensing units 130 of the touch panel 100 when the touch object 200 of the 7 phi (7 mm diameter) touches the touch panel 100 having the charge locking electrode 136. Table 6 shows the values of the mutual capacitance characteristics of the different sensing units when the touch object 200 of 7 phi (7 mm in diameter) touches the touch panel 100 in which the charge locking electrode 136 is not disposed. As can be seen from Table 5 and Table 6, the mutual capacitance characteristic value of the touch panel 100 having the charge locking electrode 136 (for example, the mutual capacitance characteristic value of the position where the touch object 200 is located is -17, -11, -9, -2) It is larger than the mutual capacitance characteristic value of the touch panel 100 in which the charge lock electrode 136 is not disposed (for example, the mutual capacitance characteristic values -11, -39, -14, -40 where the touch object 200 is located). It can be seen that the charge locking electrode 136 can improve the amount of mutual capacitance change. Therefore, the touch panel 100 having the charge locking electrode 136 can improve the touch sensitivity and reduce the Coaxial effect in a non-handheld environment.

FIG. 4 is a schematic structural diagram of a touch panel 400 according to another embodiment of the present invention. The embodiment shown in FIG. 4 can refer to the related description of FIG. 2 and FIG. 3. Referring to FIG. 3 and FIG. 4 , the touch panel 400 of the present embodiment includes a protective layer G, an upper thin layer F1, a lower thin layer F2, and a plurality of sensing units 430. Any of these sensing units 430 includes a first sensing electrode 432, a second sensing electrode 434, and a charge locking electrode 436. The first sensing electrode 432 , the second sensing electrode 434 , and the charge locking electrode 436 are disposed on the touch panel 400 in a crucifix type. The material of the first sensing electrode 432, the second sensing electrode 434, and/or the charge locking electrode 436 may be any conductive material, such as a light-transmitting conductive material such as indium tin oxide, or an opaque conductive material such as metal. The first sensing electrode 432 is disposed in the lower thin layer F2. The second sensing electrode 434 is disposed in the upper thin layer F1 and at least partially overlaps the first sensing electrode 432. The charge locking electrode 436 is disposed in the upper thin layer F1 and at least partially overlaps the first sensing electrode 432. The first sensing electrode 432, the second sensing electrode 434, and the charge locking electrode 436 are not in contact with each other. The first sensing electrode 432, the second sensing electrode 434 and the charge locking electrode 436 shown in FIG. 4 can be referred to the related description of the first sensing electrode 132, the second sensing electrode 134 and the charge locking electrode 136 shown in FIG. analogy.

The first sensing electrode 432 and the second sensing electrode 434 are staggered and insulated from each other. The first sensing electrode 432 and the charge locking electrode 436 are staggered and insulated from each other. Here, for clarity of description and to avoid overlapping of the marking lines, the symmetrical members in Fig. 4 only indicate half of the sides, and the same members of the other half are no longer marked with the drawing symbols. In one same sensing unit 430, the first sensing electrode 432 includes two first sensing pads 432a and a first connecting portion 432b arranged in parallel. In addition, the shapes of the first sensing pad 432a and the first connecting portion 432b are rectangular. As shown in FIG. 4, the two short sides of the first connecting portion 432b are electrically connected to the intermediate portions of the long sides of the first sensing pads 432a, respectively. In this embodiment, the first connecting portion 432b and the first sensing pad 432a are disposed, for example, perpendicularly, but the invention is not limited thereto.

The second sensing electrode 434 includes two second sensing pads 434a arranged in parallel And a second connecting portion 434b. Further, the shape of the second sensing pad 434a and the second connecting portion 434b is a rectangle. As shown in FIG. 4, the two short sides of the second connecting portion 434b are electrically connected to the intermediate portions of the long sides of the second sensing pads 434a, respectively. In this embodiment, the second connecting portion 434b and the second sensing pad 434a are disposed in a vertical configuration, for example, but the invention is not limited thereto. The angle between the second connecting portion 434b and the second sensing pad 434a depends on the product requirements.

Specifically, the second connecting portion 434b and the first connecting portion 432b of the present embodiment intersect each other (overlap), and the intersection has an overlapping area A _C . In the embodiment, the first connecting portion 432b and the second connecting portion 434b intersect each other perpendicularly, and the first sensing pad 432a and the second sensing pad 434a do not overlap each other. In addition, a plurality of first gaps G1 exist between the first sensing pads 432a and the second sensing pads 434a, and a plurality of second gaps G2 exist between the first sensing pads 432a and the second connecting portions 434b. In the present embodiment, the width of the first gap G1 is 0.1 mm to 0.3 mm, but the invention is not limited thereto.

In addition, the touch panel 400 of the embodiment further includes a plurality of signal lines 440 and a controller 450. The first sensing electrode 432 and the second sensing electrode 434 are electrically connected to the controller 450 by different signal lines 440 respectively. It is worth mentioning that FIG. 4 only schematically indicates the relative electrical connection relationship between each signal line 440 and the first sensing electrode 432 and the second sensing electrode 434. In practical applications, the exact cable position of the signal line 440 can be hidden from other suitable positions according to requirements, and is not limited to be the same as the layout type shown in FIG. In a practical operation mechanism, when the user touches the touch panel 400 to cause a capacitance change at the touch, the touched sensing unit 430 transmits the capacitance change signal to the controller 450 through the signal line 440 to Judge The user touches the location.

The charge lock electrode 436 is configured to float or couple to a fixed voltage. For example, but not limited to, in some embodiments, the charge lock electrode 436 can be fixedly coupled to a ground voltage. In other embodiments, the charge lock electrode 436 can be connected to any reference voltage having a fixed level. In other embodiments, the charge-locking electrode 436 can be floated, that is, the charge-locking electrode 436 is not connected to any conductive or electrical components. Therefore, the charge lock electrode 436 cannot be a drive electrode or a receive electrode.

Referring to FIG. 3 and FIG. 4 , in the case that the user does not hold the information product of the touch panel 400, the reference voltage of the touch panel 400 may be in a floating state (or LGND mode), so that the touch The reference voltage of the panel 400 may be different from the voltage of the touch object 200. In this case, the charge locking electrode 436 between the first sensing electrode 432 and the touch object 200 can absorb the capacitance value of the first sensing electrode 432 via the touch object 200, and reduce the first sensing electrode 432 via the touch. The bumper 200 is connected in series to the mutual capacitance path of the second sensing electrode 434. In the application of the ultra-slim protective layer G, the charge-locking electrode 436 can improve the amount of mutual capacitance variation, increase the signal-to-noise ratio (SNR), and help reduce the probability of occurrence of ghost points. Therefore, the touch panel 400 can improve touch sensitivity in a non-handheld environment.

The characteristics of the touch panel 400 shown in FIG. 4 will be described below with example data. In any event, the implementation of the touch panel 400 should not be limited thereto. Assuming that the dielectric constant of the protective layer G is 7.4, the thickness of the protective layer G is 0.4 mm, and the dielectric constant of the adhesive layer (not shown) between the protective layer G and the upper thin layer F1 is 3.92, and the adhesive layer is thickness The thickness of the upper thin layer F1 is 3.9, the thickness of the upper thin layer F1 is 0.045 mm, the dielectric constant of the lower thin layer F2 is 3.28, and the thickness of the lower thin layer F2 is 0.05 mm. Here, the first sensing electrode 432 is used as a driving electrode (or Tx electrode), and the second sensing electrode 434 is used as a receiving electrode (or Rx electrode). Table 7 illustrates the capacitance value of the sensing unit 430 when the touch panel 400 has not been touched. Table 7 further illustrates the capacitance value of the sensing unit in the case where the charge locking electrode 436 of the touch panel 400 is removed.

Table 8 illustrates the capacitance value of the sensing unit 430 when the touch object 200 touches the touch panel 400. In the case where the diameter of the touch object 200 is 22 mm (22 phi), and in the case where the user holds the information product in which the touch panel 400 is disposed, the mutual capacitance change ΔC of the sensing unit 430 configuring the charge lock electrode 436 The mutual capacitance change ΔC of the sensing unit having 0.17 pF without the charge locking electrode 436 is 0.19 pF. In the case where the diameter of the touch object 200 is 22 mm (22 phi), and in the case where the user does not hold the information product in which the touch panel 400 is disposed, the mutual capacitance change of the sensing unit 430 configuring the charge lock electrode 436 is Δ. C is -0.02 pF, and the mutual capacitance change ΔC of the sensing unit without the charge-locking electrode 436 is -0.1 pF. In the case where the diameter of the touch object 200 is 7 mm (7 phi), and the touch is configured on the user's hand In the case of the information product of the control panel 400, the mutual capacitance change ΔC of the sensing unit 430 configuring the charge locking electrode 436 is 0.1 pF, and the mutual capacitance change ΔC of the sensing unit without the charge locking electrode 436 is 0.14 pF. . In the case where the diameter of the touch object 200 is 7 mm (7 phi), and in the case where the user does not hold the information product in which the touch panel 400 is disposed, the mutual capacitance change of the sensing unit 430 configuring the charge lock electrode 436 is Δ. C is 0.06 pF, and the mutual capacitance change ΔC of the sensing unit without the charge-locking electrode 436 is 0.07 pF.

Table 9 illustrates the values of the mutual capacitance characteristics of the different sensing units 430 of the touch panel 400 when the touch object 200 of the 22 phi (22 mm in diameter) touches the center of the touch panel 400 having the charge locking electrode 436. Table 10 illustrates the values of the mutual capacitance characteristics of the different sensing units when the 22 phi (22 mm diameter) touch object 200 touches the center of the touch panel 400 where the charge locking electrode 436 is not disposed. Wherein, Rx1, Rx2, Rx3, Rx4, Rx5, Rx6, Rx7, Rx8, Rx9, and Rx10 represent different second sensing electrodes 434, and Tx1, Tx2, Tx3, Tx4, Tx5, Tx6, Tx7, Tx8, Tx9, Tx10 represents a different first sensing electrode 432. As can be seen from Table 9 and Table 10, the mutual capacitance characteristic value of the touch panel 400 having the charge locking electrode 436 (for example, the mutual capacitance characteristic value -11, 1, -12, -3 of the position where the touch object 200 is located) is larger than Not equipped The mutual capacitance characteristic value of the touch panel 400 of the charge locking electrode 436 (for example, the mutual capacitance characteristic value -38, -53, -39, -16 of the position where the touch object 200 is located). It can be seen that the charge locking electrode 436 can improve the amount of change in mutual capacitance. Therefore, the touch panel 400 having the charge locking electrode 436 can improve the touch sensitivity in a non-handheld environment.

Table 11 illustrates the values of the mutual capacitance characteristics of the different sensing units 430 of the touch panel 400 when the touch object 200 of the 7 phi (7 mm diameter) touches the touch panel 400 having the charge locking electrode 436. Table 12 shows the values of the mutual capacitance characteristics of the different sensing units when the touch object 200 of 7 phi (7 mm in diameter) touches the touch panel 400 in which the charge locking electrode 436 is not disposed. As can be seen from Table 11 and Table 12, the mutual capacitance characteristic value of the touch panel 400 having the charge locking electrode 436 (for example, the mutual capacitance characteristic value 41, 57, 31, 51 of the position where the touch object 200 is located) is larger than the uncharged electric charge. The mutual capacitance characteristic value of the touch panel 400 of the locking electrode 436 (for example, the mutual capacitance characteristic value 43, 33, 40, 36 of the position where the touch object 200 is located). It can be seen that the charge locking electrode 436 can improve the amount of change in mutual capacitance. Therefore, the touch panel 400 having the charge locking electrode 436 can improve the touch sensitivity and reduce the Coaxial effect in a non-handheld environment.

FIG. 5 is a schematic structural diagram of a touch panel 500 according to still another embodiment of the present invention. The embodiment shown in FIG. 5 can refer to the related description of FIG. 2 and FIG. 3. Referring to FIG. 3 and FIG. 5 , the touch panel 500 of the present embodiment includes a protective layer G, an upper thin layer F1, a lower thin layer F2, and a plurality of sensing units 530. Any of these sensing units 530 includes a first sensing electrode 532, a second sensing electrode 534, and a charge locking electrode 536. The material of the first sensing electrode 532, the second sensing electrode 534, and/or the charge locking electrode 536 may be any conductive material, such as a light-transmitting conductive material such as indium tin oxide, or an opaque conductive material such as metal. The first sensing electrode 532 is disposed in the lower thin layer F2. The second sensing electrode 534 is disposed in the upper thin layer F1 and at least partially overlaps the first sensing electrode 532. The charge locking electrode 536 is disposed in the upper thin layer F1 and at least partially overlaps the first sensing electrode 532. The first sensing electrode 532, the second sensing electrode 534, and the charge locking electrode 536 are not in contact with each other. The first sensing electrode 532, the second sensing electrode 534, and the charge locking electrode 536 shown in FIG. 5 can refer to FIG. 1. Referring to the related description of the first sensing electrode 132, the second sensing electrode 134 and the charge locking electrode 136, reference may also be made to the first sensing electrode 432, the second sensing electrode 434 and the charge locking electrode shown in FIG. The relevant description of 436 and so on.

The first sensing electrode 532 and the second sensing electrode 534 are staggered and insulated from each other. The first sensing electrode 532 and the charge locking electrode 536 are staggered and insulated from each other. In one same sensing unit 530, the first sensing electrode 532 includes a first sensing pad 532a, a second sensing pad 532c, a third sensing pad 532e, a first connecting portion 532b, and a second connecting portion 532d. The first sensing pad 532a, the second sensing pad 532c, the third sensing pad 532e, the first connecting portion 532b, and the second connecting portion 532d are all rectangular. As shown in FIG. 5, the first sensing pad 532a, the second sensing pad 532c, and the third sensing pad 532e are parallel to each other, and the two short sides of the first connecting portion 532b are electrically connected to the length of the first sensing pad 532a. The middle portion of the side and the middle portion of the first long side of the second sensing pad 532c, the two short sides of the second connecting portion 532d are electrically connected to the middle portion and the third portion of the second long side of the second sensing pad 532c, respectively. The middle portion of the long side of the pad 532e is sensed.

The second sensing electrode 534 includes a fourth sensing pad 534b, a fifth sensing pad 534c, a third connecting portion 534a, and a fourth connecting portion 534d. The fourth sensing pad 534b, the fifth sensing pad 534c, the third connecting portion 534a, and the fourth connecting portion 534d are all rectangular. The two short sides of the third connecting portion 534a are electrically connected to the long sides of the fourth sensing pad 534b and the long sides of the fifth sensing pad 534c, respectively, and the two short sides of the fourth connecting portion 534d are electrically connected to the fourth sensing respectively. The long side of the pad 534b and the long side of the fifth sensing pad 534c. The third connecting portion 534a and the first connecting portion 532b intersect each other, and the fourth connecting portion 534d and the second connecting portion 532d intersect each other.

As shown in FIG. 5, in the embodiment, the third connecting portion 534a and the first connecting portion 532b intersect each other perpendicularly, and the fourth connecting portion 534d and the second connecting portion 532d intersect each other perpendicularly, and the first sensing pad 532a The second sensing pad 532c, the third sensing pad 532e, the fourth sensing pad 534b, and the fifth sensing pad 534c do not overlap each other, but the invention is not limited thereto.

In addition, the touch panel 500 of the embodiment further includes a plurality of signal lines 540 and a controller 550. The first sensing electrode 532 and the second sensing electrode 534 are electrically connected to the controller 550 by different signal lines 540 respectively. It is worth mentioning that FIG. 5 only schematically indicates the relative electrical connection relationship between each signal line 540 and the first sensing electrode 532 and the second sensing electrode 534. In practical applications, the exact position of the signal line 540 can be hidden from other suitable positions according to requirements, and is not limited to be the same as the layout type shown in FIG. In a practical operation mechanism, when the user touches the touch panel 500 to cause a capacitance change at the touch, the touched sensing unit 530 transmits the capacitance change signal to the controller 550 through the signal line 540 to Determine the user's touch location.

Charge lock electrode 536 is configured to float or couple to a fixed voltage. For example, but not limited to, in some embodiments, the charge lock electrode 536 can be fixedly coupled to a ground voltage. In other embodiments, the charge lock electrode 536 can be connected to any reference voltage having a fixed level. In other embodiments, the charge-locking electrode 536 can be floated, that is, the charge-locking electrode 536 is not connected to any conductive or electrical components. Therefore, the charge lock electrode 536 cannot be a drive electrode or a receive electrode.

Referring to FIG. 3 and FIG. 5 , in the case that the user does not hold the information product of the touch panel 500, the reference voltage of the touch panel 500 may be in a floating state (or LGND mode), so that the touch is performed. The reference voltage of panel 500 may be different from the voltage of touch object 200. In this case, the charge-locking electrode 536 between the first sensing electrode 532 and the touch object 200 can absorb the capacitance value of the first sensing electrode 532 via the touch object 200, and reduce the first sensing electrode 532 via the touch. The bumper 200 is connected in series to the mutual capacitance path of the second sensing electrode 534. In the application of the ultra-slim protective layer G, the charge-locking electrode 536 can improve the mutual capacitance variation, increase the signal-to-noise ratio (SNR), and help reduce the probability of occurrence of ghost points. Therefore, the touch panel 500 can improve the touch sensitivity in a non-handheld environment.

The characteristics of the touch panel 500 shown in FIG. 5 will be described below using example data. In any event, the implementation of the touch panel 500 should not be limited thereto. Assuming that the dielectric constant of the protective layer G is 7.4, the thickness of the protective layer G is 0.4 mm, and the dielectric constant of the adhesive layer (not shown) between the protective layer G and the upper thin layer F1 is 3.92, and the adhesive layer is The thickness is 0.1 mm, the dielectric constant of the upper thin layer F1 is 3.9, the thickness of the upper thin layer F1 is 0.045 mm, the dielectric constant of the lower thin layer F2 is 3.28, and the thickness of the lower thin layer F2 is 0.05 mm. Here, the first sensing electrode 532 is used as a driving electrode (or Tx electrode), and the second sensing electrode 534 is used as a receiving electrode (or Rx electrode). Table 13 illustrates the capacitance value of the sensing unit 530 when the touch panel 500 has not been touched. Table 13 further illustrates the capacitance value of the sensing unit in the case where the charge lock electrode 536 of the touch panel 500 is removed.

Table 14 illustrates the capacitance value of the sensing unit 530 when the touch object 200 touches the touch panel 500. In the case where the diameter of the touch object 200 is 22 mm (22 phi), and in the case where the user holds the information product in which the touch panel 500 is disposed, the mutual capacitance change ΔC of the sensing unit 530 configuring the charge lock electrode 536 is set. The mutual capacitance change ΔC of the sensing unit of 0.24 pF without the charge-locking electrode 536 is 0.29 pF. In the case where the diameter of the touch object 200 is 22 mm (22 phi), and in the case where the user does not hold the information product in which the touch panel 500 is disposed, the mutual capacitance change of the sensing unit 530 configuring the charge lock electrode 536 is Δ. C is -0.02 pF, and the mutual capacitance change ΔC of the sensing unit without the charge-locking electrode 536 is -0.03 pF. In the case where the diameter of the touch object 200 is 7 mm (7 phi), and in the case where the user holds the information product in which the touch panel 500 is disposed, the mutual capacitance change ΔC of the sensing unit 530 configuring the charge lock electrode 536 is set. The mutual capacitance change ΔC of the sensing unit of 0.15 pF without the charge-locking electrode 536 is 0.12 pF. In the case where the diameter of the touch object 200 is 7 mm (7 phi), and in the case where the user does not hold the information product in which the touch panel 500 is disposed, the mutual capacitance change of the sensing unit 530 configuring the charge lock electrode 536 is Δ. C is 0.09 pF, and the mutual capacitance change ΔC of the sensing unit without the charge-locking electrode 536 is 0.05 pF.

Table 15 illustrates the values of the mutual capacitance characteristics of the different sensing units 530 of the touch panel 500 when the touch object 200 of the 22 phi (22 mm in diameter) touches the center of the touch panel 500 having the charge locking electrode 536. Table 16 shows the values of the mutual capacitance characteristics of the different sensing units when the 22 phi (22 mm diameter) touch object 200 touches the center of the touch panel 500 where the charge locking electrode 536 is not disposed. Wherein, Rx1, Rx2, Rx3, Rx4, Rx5, Rx6, Rx7, Rx8, Rx9, Rx10 represent different second sensing electrodes 534, and Tx1, Tx2, Tx3, Tx4, Tx5, Tx6, Tx7, Tx8, Tx9, Tx10 represents a different first sensing electrode 532. As can be seen from Table 15 and Table 16, the mutual capacitance characteristic value of the touch panel 500 having the charge locking electrode 536 (for example, the mutual capacitance characteristic values of the position where the touch object 200 is located -7, -5, -13, -10) It is larger than the mutual capacitance characteristic value of the touch panel 500 in which the charge lock electrode 536 is not disposed (for example, the mutual capacitance characteristic values -14, -13, -8, -15 where the touch object 200 is located). It can be seen that the charge locking electrode 536 can improve the amount of change in mutual capacitance. Therefore, the touch panel 500 having the charge locking electrode 536 can improve the touch sensitivity in a non-handheld environment.

Table 17 illustrates the mutual capacitance characteristic values of the different sensing units 530 of the touch panel 500 when the touch object 200 of the 7 phi (7 mm diameter) touches the touch panel 500 having the charge locking electrode 536. Table 18 shows that when the touch object 200 of 7 phi (7 mm in diameter) touches the touch panel 500 in which the charge lock electrode 536 is not disposed, the difference is different. The mutual capacitance characteristic value of the sensing unit. As can be seen from Table 17 and Table 18, the mutual capacitance characteristic value of the touch panel 500 having the charge locking electrode 536 (for example, the mutual capacitance characteristic value 48, 50, 43, 45 of the position where the touch object 200 is located) is larger than the uncharged electric charge. The mutual capacitance characteristic value of the touch panel 500 of the locking electrode 536 (for example, the mutual capacitance characteristic value 41, 37, 37, 25 of the position where the touch object 200 is located). It can be seen that the charge locking electrode 536 can improve the amount of change in mutual capacitance. Therefore, the touch panel 500 having the charge locking electrode 536 can improve the touch sensitivity and reduce the Coaxial effect in a non-handheld environment.

In summary, the touch panel (100, 400 or 500) of the embodiment of the present invention additionally configures a charge locking electrode (136, 436) between the first sensing electrode (132, 432 or 532) and the touch object. Or 536) to absorb the capacitance value of the first sensing electrode via the touch object. Therefore, the touch panel of the embodiment can improve the touch sensitivity in a non-handheld environment.

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

Claims (12)

A touch panel includes: a thin layer; an upper layer disposed on the lower layer; a protective layer disposed on the upper layer; and a plurality of sensing units, any of the sensing units One includes a first sensing electrode, a second sensing electrode and a charge locking electrode, the first sensing electrode is disposed in the lower layer, and the second sensing electrode is disposed in the upper layer and At least partially overlapping the first sensing electrode, the charge locking electrode is disposed in the upper layer and at least partially overlaps the first sensing electrode, wherein the first sensing electrode and the second sensing electrode And the charge-locking electrodes are not in contact with each other, and the charge-locking electrodes are configured to float or couple to a fixed voltage, wherein the second sensing electrodes are staggered with the first sensing electrodes, and the charge-locking electrodes Interlaced with the first sensing electrodes, wherein the first sensing electrodes comprise two first sensing pads arranged in parallel and a first connecting portion in an same sensing unit of the sensing units, The first sensing pads and the first connecting portion are shaped as a moment The two short sides of the first connecting portion are respectively electrically connected to the middle portion of the long sides of the first sensing pads, and the second sensing electrode comprises two second sensing pads arranged in parallel and one second connection The second sensing pad and the second connecting portion are rectangular in shape, and the two short sides of the second connecting portion are electrically connected to the intermediate portions of the long sides of the second sensing pads, respectively. The two connecting portions and the first connecting portion intersect each other. The touch panel of claim 1, wherein the fixed voltage is a ground voltage or a reference voltage having a fixed level. The touch panel of claim 1, wherein the first sensing electrode is a driving electrode and the second sensing electrode is a receiving electrode. The touch panel of claim 1, wherein the first sensing electrode is a receiving electrode and the second sensing electrode is a driving electrode. The touch panel of claim 1, wherein in the same sensing unit, the first connecting portion and the second connecting portion perpendicularly intersect each other, and the first sensing pad and the second The sensing pads do not overlap each other. The touch panel of claim 1, further comprising: a plurality of signal lines; and a controller, wherein the first sensing electrodes and the second sensing electrodes are respectively electrically connected by the signal lines Connect to the controller. A touch panel includes: a thin layer; an upper layer disposed on the lower layer; a protective layer disposed on the upper layer; and a plurality of sensing units, any of the sensing units One includes a first sensing electrode, a second sensing electrode and a charge locking electrode, the first sensing electrode is disposed in the lower layer, and the second sensing electrode is disposed in the upper layer and At least partially overlapping the first sensing electrode, the charge-locking electrode is disposed in the upper layer and at least partially overlaps the first sensing electrode, wherein the first sensing electrode and the second sensing electrode a pole and the charge-locking electrode are not in contact with each other, and the charge-locking electrode is configured to float or couple to a fixed voltage, wherein the second sensing electrode is staggered with the first sensing electrode, and the charge is locked An electrode is interlaced with the first sensing electrode, wherein the first sensing electrode includes a first sensing pad and a second sensing pad that are both rectangular in a same sensing unit of the sensing units. a third sensing pad, a first connecting portion and a second connecting portion, the first sensing pad, the second sensing pad and the third sensing pad are parallel to each other, and the first connecting portion is two The short side is electrically connected to the middle portion of the long side of the first sensing pad and the middle portion of the first long side of the second sensing pad, and the two short sides of the second connecting portion are electrically connected to the first portion An intermediate portion of the second long side of the second sensing pad and an intermediate portion of the long side of the third sensing pad, the second sensing electrode includes a fourth sensing pad that is rectangular, and a fifth sensing a pad, a third connecting portion and a fourth connecting portion, wherein the two short sides of the third connecting portion are electrically connected to the fourth sense One of the long sides of the pad and one of the long sides of the fifth sensing pad, the two short sides of the fourth connecting portion are electrically connected to the long side of the fourth sensing pad and the length of the fifth sensing pad respectively And the third connecting portion and the first connecting portion intersect each other, and the fourth connecting portion and the second connecting portion intersect each other. The touch panel of claim 1, wherein the fixed voltage is a ground voltage or a reference voltage having a fixed level. The touch panel of claim 1, wherein the first sensing electrode is a driving electrode and the second sensing electrode is a receiving electrode. The touch panel of claim 1, wherein the first sensing electrode is a receiving electrode and the second sensing electrode is a driving electrode. The touch panel of claim 1, wherein in the same sensing unit, the first connecting portion and the third connecting portion perpendicularly intersect each other, the second connecting portion and the fourth connecting portion The first sensing pad, the second sensing pad, the third sensing pad, the fourth sensing pad and the fifth sensing pad do not overlap each other. The touch panel of claim 1, further comprising: a plurality of signal lines; and a controller, wherein the first sensing electrodes and the second sensing electrodes are respectively electrically connected by the signal lines Connect to the controller.