CN103365500A - Touch unit applied to capacitive touch panel and capacitive touch panel - Google Patents

Abstract

The present invention discloses a touch unit applied to a capacitive touch panel and a related capacitive touch panel. The touch unit comprises a first electrode and a second electrode, wherein the first electrode is connected to a scanning signal transmission circuit on the capacitive touch panel and is used to receive a scanning signal, and the second electrode is connected to a detection circuit on the capacitive touch panel; in addition, the second electrode is not connected to the first electrode, and the pattern of the second electrode is a fishbone pattern, and the width of the end of at least a part of the branches in the fishbone pattern is greater than the width of the front end.

Description

Touch unit applied to capacitive touch panel and capacitive touch panel

technical field

The invention relates to a capacitive touch panel, in particular to a capacitive touch panel in which electrodes of a touch unit are herringbone patterns.

Background technique

Please refer to FIG. 1. FIG. 1 is a schematic diagram of some components on a capacitive touch panel 100. Referring to FIG. 1, the capacitive touch panel 100 includes a scanning signal transmission circuit 110, a detection circuit 120 and a plurality of touch units 130 (Figure 1 only shows three touch units in one channel), wherein the touch unit 130 has a first electrode 132 and a second electrode 134, and the first electrode 132 and the second electrode 134 are triangular patterns (or a zigzag pattern). In the operation of the capacitive touch panel 100, the scanning signal transmission circuit 110 will transmit a scanning signal Vs to the first electrode 132 in the touch unit 130, and the detection circuit 120 will simultaneously detect the voltage change on the second electrode 134 In order to further obtain the capacitance change information on the touch unit 130 , and judge whether there is a pressing contact on the touch unit 130 according to it. Since the operation of the above-mentioned capacitive touch panel 100 should be well known to those skilled in the field of the present invention, details of the operation will not be repeated here.

However, in the operation of the capacitive touch panel 100, the coupling capacitance between the first electrode 132 and the second electrode 134 in the touch unit 130 is relatively small, so the touch sensitivity and the signal to noise ratio (Signal to Noise Ratio) , SNR) will be relatively poor.

Contents of the invention

Therefore, one of the objectives of the present invention is to provide a capacitive touch panel, on which the electrodes of the touch unit are in a herringbone pattern, so as to solve the above-mentioned problems.

According to an embodiment of the present invention, a touch unit applied to a capacitive touch panel includes a first electrode and a second electrode, wherein the first electrode is connected to a scanning signal on the capacitive touch panel The transmission circuit is used to receive a scanning signal, and the second electrode is connected to a detection circuit on the capacitive touch panel; in addition, the second electrode is not connected to the first electrode, and the pattern of the second electrode It is a fishbone pattern, and the end width of at least a part of the branches in the fishbone pattern is larger than the front end width.

According to another embodiment of the present invention, a touch unit applied to a capacitive touch panel includes a first electrode and a second electrode, wherein the first electrode is connected to a scanning electrode on the capacitive touch panel a signal transmission circuit, and is used to receive a scanning signal, and the second electrode is connected to a detection circuit on the capacitive touch panel; in addition, the detection circuit is connected to other multiple touch units through a plurality of wires , the second electrode is not connected to the first electrode, the pattern of the second electrode is a fishbone pattern, and there is no distance between the branch closest to the plurality of traces in the fishbone pattern and the plurality of traces has the first electrode.

According to another embodiment of the present invention, a capacitive touch panel includes a scanning signal transmission circuit, a detection circuit, and a plurality of touch units, wherein each touch unit of the plurality of touch units includes a first electrode and a second electrode, wherein the first electrode is connected to a scanning signal transmission circuit on the capacitive touch panel, and is used to receive a scanning signal, and the second electrode is connected to a scanning signal transmission circuit on the capacitive touch panel A detection circuit; in addition, the second electrode is not connected to the first electrode, the pattern of the second electrode is a fishbone pattern, and the end width of at least a part of the branches in the fishbone pattern is larger than the front end width.

According to another embodiment of the present invention, a capacitive touch panel includes a scanning signal transmission circuit, a detection circuit, and a plurality of touch units, wherein each touch unit of the plurality of touch units includes a first electrode and a second electrode, wherein the first electrode is connected to a scanning signal transmission circuit on the capacitive touch panel, and is used to receive a scanning signal, and the second electrode is connected to a scanning signal transmission circuit on the capacitive touch panel A detection circuit; in addition, the detection circuit is connected to other touch units through a plurality of wires, the second electrode is not connected to the first electrode, the pattern of the second electrode is a fishbone pattern, and the There is no first electrode between the branch closest to the plurality of traces in the fishbone pattern and the plurality of traces.

Description of drawings

FIG. 1 is a schematic diagram of some components on a capacitive touch panel;

2 is a schematic diagram of a capacitive touch panel according to an embodiment of the present invention;

3 is a schematic diagram of a touch unit according to another embodiment of the present invention;

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

Description of main component symbols

100, 200 Capacitive touch panel

110, 210 Scan signal transmission circuit

120, 220 detection circuit

130, 230, 330, 430 Touch unit

132, 232, 332, 432 first electrode

134, 234, 334, 434 Second electrode

334_1, 334_2, 434_1, 434_2 branches

Detailed ways

Please refer to FIG. 2 , which is a schematic diagram of a capacitive touch panel 200 according to an embodiment of the present invention. As shown in FIG. 2, the capacitive touch panel 200 includes a scanning signal transmission circuit 210, a detection circuit 220 and a plurality of touch units 230, wherein each touch unit 230 has a first electrode 232 and a second electrode 234, wherein the second electrode 234 is not connected to the first electrode 232, the pattern of the second electrode 234 is a fishbone pattern, and the width of the branch of the fishbone pattern is larger than the width of the front end. In addition, the first electrode 232 and the second electrode 234 are Indium Tin Oxide (ITO) electrodes of the same layer.

In addition, in the touch unit 230 shown in FIG. 2 , the end width of each branch of the fishbone pattern is greater than the width of the front end. However, in other embodiments of the present invention, the fishbone pattern may only have a part of branches. The width of the end of the branch is greater than the width of the front end, while the width of other branches can be kept fixed or changed in other ways, and these design changes should belong to the scope of the present invention.

In the operation of the capacitive touch panel 200, the scanning signal transmission circuit 210 will transmit a scanning signal Vs to the first electrode 232 in the touch unit 230, and the detection circuit 220 will simultaneously detect the voltage change on the second electrode 234 In order to further obtain the capacitance change information on the touch unit 230 , and judge whether there is a pressing contact on the touch unit 230 according to it. Since the operations of the scanning signal transmission circuit 210 and the detection circuit 220 are well known to those skilled in the field of the present invention, details of the operations will not be repeated here.

Referring to the touch unit 230 shown in FIG. 2, since there is a larger coupling area between the first electrode 232 and the second electrode 234 (that is, the channel length between the first electrode 232 and the second electrode 234 is longer), Therefore, the coupling capacitance between the first electrode 132 and the second electrode 134 detected by the detection circuit 220 will be relatively large, that is, the touch sensitivity and signal-to-noise ratio will be better. For details, please refer to the comparison table of measurement data between the conventional touch unit 130 shown in FIG. 1 and the touch unit 230 shown in FIG. 1 . The touch unit 230 will have a higher coupling capacitance value, and the difference between the coupling capacitance C _non-touch when there is no pressing contact and the coupling capacitance C _touch when there is pressing contact is relatively large.

In addition, since the user is using the capacitive touch panel 200 , the position pressed by the finger may be pressed on multiple wires connecting the touch unit 230 to the detection circuit 220 . contact, but the detection circuit 220 still detects a slight change in the coupling capacitance, which further causes an error in judging the coupling capacitance. Therefore, in another embodiment of the present invention, the touch unit on the touch panel 200 230 can be replaced by a touch unit 330 as shown in FIG. There is no first electrode 332 between the branches of the multiple traces of the circuit 220 (ie, 334_1 and 334_2 shown in the figure) and the multiple traces.

In addition, in another embodiment of the present invention, the touch unit 230 on the touch panel 200 can also be replaced by the touch unit 430 shown in FIG. 4 , wherein the touch unit 430 has a first electrode 432 and a The second electrode 434, and the branch of the second electrode 434 with a fishbone pattern closest to the plurality of wirings connected to the detection circuit 220 (ie, 434_1 and 434_2 shown in the figure) is not separated from the plurality of wirings. It has a first electrode 432 .

In the touch units 330 and 430 shown in FIG. 3 and FIG. 4 , since there are no first electrodes 332 and 432 between the second electrodes 334 and 434 and the plurality of wires, the second electrodes of each touch unit Therefore, the coupling capacitance between the electrodes and the traces of other touch units connected to the detection circuit 220 can be reduced, so the detection circuit 220 can determine the coupling capacitance more accurately.

In addition, it should be noted that the size, width, spacing, and ratio of the first electrode and the second electrode shown in FIGS. 2 to 4 are not limitations of the present invention. In actual design, the first electrode and the second electrode The size, width, spacing, and ratio of can be adjusted according to the needs of users.

To briefly summarize the present invention, in the capacitive touch panel of the present invention, the touch unit includes a first electrode connected to the scanning signal transmission circuit, and a second electrode connected to the detection circuit, wherein the second The pattern of the electrode is a fishbone pattern, and the end width of at least a part of the branches in the fishbone pattern is larger than the front end width; in addition, in another embodiment, there is no first electrode between the second electrode and the plurality of wires. An electrode, so that the capacitive touch panel of the present invention can have better touch sensitivity and signal-to-noise ratio, so as to solve the problems in the prior art.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims (10)

1. A touch unit applied to a capacitive touch panel, comprising: The first electrode is connected to a scan signal transmission circuit on the capacitive touch panel, and is used to receive a scan signal; and The second electrode is connected to a detection circuit on the capacitive touch panel; Wherein the second electrode is not connected to the first electrode, the pattern of the second electrode is a fishbone pattern, and the end width of at least a part of the branches in the fishbone pattern is larger than the front end width. 2. The touch unit according to claim 1, wherein the detection circuit is connected to other touch units through a plurality of wires, and the branch of the herringbone pattern closest to the wires is connected to the plurality of wires. There is no first electrode between the two wires. 3. The touch control unit as claimed in claim 1, wherein the first electrode and the second electrode are Indium Tin Oxide (ITO) electrodes of the same layer. 4. A touch unit applied to a capacitive touch panel, comprising: The first electrode is connected to a scan signal transmission circuit on the capacitive touch panel, and is used to receive a scan signal; and The second electrode is connected to a detection circuit on the capacitive touch panel, wherein the detection circuit is also connected to a plurality of other touch units through a plurality of wires; Wherein the second electrode is not connected to the first electrode, the pattern of the second electrode is a fishbone pattern, and there is no distance between the branch closest to the plurality of traces in the fishbone pattern and the plurality of traces has the first electrode. 5. The touch control unit as claimed in claim 4, wherein the first electrode and the second electrode are Indium Tin Oxide (ITO) electrodes of the same layer. 6. A capacitive touch panel comprising: Scanning signal transmission circuit; detection circuitry; and A plurality of touch units, wherein each touch unit in the plurality of touch units includes: a first electrode connected to the scanning signal transmission circuit for receiving a scanning signal; and a second electrode connected to the detection circuit; Wherein the second electrode is not connected to the first electrode, the pattern of the second electrode is a fishbone pattern, and the end width of at least a part of the branches in the fishbone pattern is larger than the front end width. 7. The capacitive touch panel according to claim 6, wherein the detection circuit is connected to the plurality of touch units through a plurality of wires, and the branch of the herringbone pattern closest to the wires is connected to the There is no first electrode between the plurality of wires. 8. The capacitive touch panel as claimed in claim 6, wherein the first electrode and the second electrode are Indium Tin Oxide (ITO) electrodes of the same layer. 9. A capacitive touch panel, comprising: Scanning signal transmission circuit; detection circuitry; and A plurality of touch units, wherein each touch unit in the plurality of touch units includes: a first electrode connected to the scanning signal transmission circuit for receiving a scanning signal; and The second electrode is connected to the detection circuit, wherein the detection circuit is connected to the plurality of touch units through a plurality of wires; Wherein the second electrode is not connected to the first electrode, the pattern of the second electrode is a fishbone pattern, and there is no distance between the branch closest to the plurality of traces in the fishbone pattern and the plurality of traces has the first electrode. 10. The capacitive touch panel as claimed in claim 9, wherein the first electrode and the second electrode are Indium Tin Oxide (ITO) electrodes of the same layer.

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