CN103793121B

CN103793121B - Single-layer multi-point capacitive touch screen

Info

Publication number: CN103793121B
Application number: CN201410084141.6A
Authority: CN
Inventors: 张靖恺; 郭明
Original assignee: FocalTech Systems Ltd
Current assignee: FocalTech Systems Ltd
Priority date: 2014-03-07
Filing date: 2014-03-07
Publication date: 2017-04-26
Anticipated expiration: 2034-03-07
Also published as: CN103793121A; TW201502943A; TWI550485B

Abstract

A single-layer multi-point capacitive touch screen comprises multiple electrode units, wherein each electrode unit comprises multiple first electrodes and multiple second electrodes. In at least one electrode unit, each first electrode of at least one part of first electrodes corresponds to at least two second electrodes. The first electrodes and the second electrodes comprise two types of electrodes. The first-type first electrodes and the first-type second electrodes are independent and are not connected. The second-type first electrodes and the second-type second electrodes are respectively connected at least one of the other second-type first electrodes and the other second-type second electrodes, and the second-type first electrodes and the second-type second electrodes which are connected are not adjacent. The connected second-type first electrodes do not correspond to the same-type first electrodes, and the connected second-type second electrodes do not correspond to the same-type first electrodes. In addition, the connected second-type first electrodes and the connected second-type second electrodes are not provided with corresponding portions, or only one of the connected second-type first electrodes is in one-to-one correspondence with one of the connected second-type second electrodes. The touch screen production yield is improved.

Description

Single-layer multi-point capacitive touch screen

Technical Field

The invention relates to the technical field of touch screens, in particular to a single-layer multipoint capacitive touch screen.

Background

The touch screen is a touch sensing input device widely used at present, and according to the touch sensing principle, the touch screen in the prior art includes a resistive touch screen, a capacitive touch screen, a surface infrared touch screen, and the like. The resistive touch screen is widely used due to the advantages of low cost, easy realization, simple control and the like; in recent years, capacitive touch panels have been popular because of their high light transmittance, wear resistance, resistance to environmental temperature changes, long life, and high-level complex functions that enable multi-point contact.

The mutual capacitance touch screen is an emerging technology in the capacitive touch screen, has a good inhibition effect on noise and stray capacitance to the ground, and can realize real multi-point touch, so that the mutual capacitance touch screen has become a main direction for manufacturers of various capacitive touch screen chips. Because the first electrode and the second electrode which form the coupling capacitance node in the mutual capacitance touch screen are positioned on the same layer, and the mutual capacitance touch screen can realize real multi-point touch, the mutual capacitance touch screen is also called as a single-layer multi-point capacitance touch screen.

Fig. 1 is a schematic diagram of electrode distribution and lead-out lines of a single-layer multi-point capacitive touch screen in the prior art, and referring to fig. 1, the single-layer multi-point capacitive touch screen in the prior art includes: a plurality of electrode units 10 arranged in parallel; each electrode unit 10 includes a plurality of first electrodes 11 arranged along the column direction, and a strip-shaped second electrode 12 opposite to the plurality of first electrodes and extending along the column direction, that is, one second electrode 12 corresponds to the plurality of first electrodes 11; each first electrode 11 forms a coupling capacitance node with the opposite second electrode, one coupling capacitance node corresponding to one touch point.

In order to electrically connect the first and second electrodes 11 and 12 to a flexible circuit (FPC) board, the first and second electrodes 11 and 12 need to be electrically connected to the FPC board by lead wires (not shown). In the prior art, a wire bonding process (bonding) is used to electrically connect the lead-out wire with a pad on the FPC board. In the routing process, the requirements on the process and the requirements on welding materials are high, so that the problem of short circuit of adjacent outgoing lines is avoided as much as possible.

However, in the conventional single-layer multi-point capacitive touch screen, each first electrode 11 needs one lead wire to be connected to the FPC board, and since the number of the first electrodes 11 is very large, the number of lead wires led out from the whole touch screen is very large, and the number of corresponding pads is also very large (one lead wire corresponds to one pad). Although the routing process and the materials used in the routing process are strictly controlled, the touch screen is led out from all the lead-out wires along the same direction, the number of the lead-out wires is very large, the number of the corresponding welding pads is large, the distance between the adjacent welding pads is very small, the problem of short circuit of the adjacent lead-out wires still occurs in the routing process, and the production yield of the touch screen is low.

Disclosure of Invention

The invention solves the problems that: the novel single-layer multi-point capacitive touch screen is provided, the number of outgoing lines can be reduced, and the production yield of the touch screen is improved.

In order to solve the above problems, the present invention provides a single-layer multi-point capacitive touch screen, which includes a plurality of electrode units arranged in parallel, each electrode unit including a first electrode group and a second electrode group; the first electrode group comprises a plurality of first electrodes arranged in a row, and the second electrode group comprises a plurality of second electrodes arranged in a row; the first electrode group and the second electrode group are adjacent and arranged in parallel, a first electrode in the first electrode group is adjacent and correspondingly arranged with a corresponding second electrode in the second electrode group, and the first electrode and the corresponding second electrode form a coupling capacitance node;

wherein, in at least one electrode unit:

each first electrode in at least part of the first electrodes corresponds to at least two second electrodes;

a first electrode of the first electrode group includes: a first type of first electrode and a second type of first electrode; the first electrodes of the first type are independent of each other and are not connected; each of the second-type first electrodes is connected with at least one other second-type first electrode, and the second-type first electrodes which are connected with each other are not adjacent;

the second electrode of the second electrode group includes: a first-type second electrode and a second-type second electrode; the first-type second electrodes are independent of each other and are not connected; each second-type second electrode is connected with at least one other second-type second electrode, and the second-type second electrodes which are connected with each other are not adjacent;

the second type of connected first electrodes do not correspond to the same second electrode, and the second type of connected second electrodes do not correspond to the same first electrode; and the connected second-type first electrodes and the mutually connected second-type second electrodes are staggered without corresponding parts, or only one of the connected second-type first electrodes corresponds to one of the mutually connected second-type second electrodes.

Optionally, the electrodes between the two second-type first electrodes connected to each other are: a first electrode of a first type; or, a second type of first electrode; alternatively, a first type of first electrode and a second type of first electrode are included.

Optionally, the electrodes between the two second type second electrodes connected to each other are: a first-type second electrode; or, a second type of second electrode; alternatively, a first type of second electrode and a second type of second electrode are included.

Optionally, one of the at least one electrode unit is an electrode unit located on the outer side.

Optionally, in the at least one electrode unit:

the first electrode positioned on one side edge of the electrode unit only corresponds to one second electrode, and the rest first electrodes respectively correspond to two second electrodes; the second electrodes positioned on the opposite side edge of the electrode unit correspond to only one first electrode, and the rest second electrodes correspond to two first electrodes respectively.

Optionally, in the at least one electrode unit:

at least two first electrodes respectively correspond to only one second electrode, and the rest first electrodes respectively correspond to two second electrodes;

at least two second electrodes respectively correspond to only one first electrode, and the rest second electrodes respectively correspond to two first electrodes;

the first electrode corresponding to one second electrode is paired with the second electrode corresponding to one first electrode; one pair of the electrodes is respectively positioned at the two opposite side edges of the electrode unit; the other pairs are located between opposite side edges of the electrode unit, and the first electrode and the second electrode in each pair are located in adjacent rows.

Optionally, in at least one electrode unit:

the arrangement mode of each first electrode in the first electrode group is the reverse of the arrangement mode of each second electrode in the second electrode group.

Optionally, the plurality of electrode units have the same structure.

Optionally, each first electrode in the first type of first electrodes is individually connected to one outgoing line;

the second type first electrodes which are connected together share one lead-out wire;

each second electrode in the first type of second electrodes is independently connected with an outgoing line;

the second type second electrodes which are connected together share one lead-out wire.

Optionally, the outgoing line leads out the touch screen along a column direction or leads out the touch screen along a row direction.

Optionally, the outgoing lines are led out of the touch screen along the column direction, and in each electrode unit, the outgoing line connected with the first electrode and the outgoing line connected with the second electrode are respectively located on two sides of the electrode unit.

Optionally, leading-out wires connected with the first electrodes are led out of the touch screen along the same column direction; or leading out wires connected with part of the first electrodes out of the touch screen along one direction of the column direction, and leading out wires connected with the rest of the first electrodes out of the touch screen along the other direction of the column direction;

leading out wires connected with the second electrodes are led out of the touch screen along the same column direction; or the outgoing lines connected with part of the second electrodes are led out of the touch screen along one direction of the column direction, and the outgoing lines connected with the rest of the second electrodes are led out of the touch screen along the other direction of the column direction.

Optionally, the partial first electrodes are all located on the same side of the rest of the first electrodes; the part of the second electrodes are all positioned on the same side of the rest of the second electrodes.

Optionally, in at least one electrode unit, the number of the outgoing lines connected to the first electrode is equal to or different from the number of the outgoing lines connected to the second electrode.

Optionally, in at least one electrode unit, a predetermined reference voltage outgoing line led out in the column direction is arranged between the first electrode group and the second electrode group.

Optionally, an outgoing line with a predetermined reference voltage extending along the column direction is arranged between at least two adjacent electrode units.

Optionally, in all the electrode units, the first electrode is located on the same side of the second electrode; or,

in all the electrode units, the first electrode in one of the two adjacent electrode units is positioned on one side of the second electrode, and the first electrode in the other electrode unit is positioned on the other side of the second electrode.

Compared with the prior art, the technical scheme of the invention has the following advantages:

due to the at least one electrode unit: each first electrode in at least part of the first electrodes corresponds to at least two second electrodes, and the first electrodes and the second electrodes are divided into two types: the first-type first electrodes are independent and not connected with each other, each of the second-type first electrodes is connected with at least one other second-type first electrode, and the second-type first electrodes which are connected with each other are not adjacent; the first type second electrodes are independent and not connected with each other, each of the second type second electrodes is connected with at least one other second type second electrode, and the second type second electrodes which are connected with each other are not adjacent; in addition, the distribution of the first electrodes and the second electrodes is such that the coupling capacitance node between each first electrode and each second electrode is unique. Therefore, compared with the existing single-layer multipoint capacitive touch screen, the number of the electrodes in the electrode unit is reduced, and the number of the outgoing lines led out from the electrode unit can be correspondingly reduced, so that the problem of short circuit of the adjacent outgoing lines in the routing process of the electrode unit can be solved, and the production yield of the touch screen is improved.

Moreover, since the first electrode and the second electrode in such an electrode unit are divided into two types: the first-type first electrode, the second-type first electrode, the first-type second electrode and the second-type second electrode are described above; therefore, when the electrode units are wired, the outgoing lines can be distributed on two sides of the corresponding electrode units, and the problem that the linearity, the accuracy and other performances of the touch screen are reduced due to the fact that a suspension block needs to be arranged in an area without the outgoing lines between the electrode units and the adjacent electrode units is solved.

In a specific embodiment, the electrode unit located at the outer side of the touch screen is one of the electrode units, so that the problems that the touch screen is asymmetric in left and right and has a large influence on edge performance due to the fact that the touch screen has the wiring on one side and does not have the wiring on the other side can be solved.

In the specific embodiment, all the electrode units are the electrode units meeting the conditions, the number of the outgoing lines of all the electrode units can be reduced, accordingly, the problem of short circuit of adjacent outgoing lines of the whole touch screen in a routing process can be solved, and the production yield of the touch screen is improved better and is low. Moreover, when all the electrode units are wired, the outgoing lines are distributed on two sides of the corresponding electrode units, and the problem that the linearity, the accuracy and other performances of the touch screen are reduced due to the fact that a suspension block needs to be arranged in an area without the outgoing lines between adjacent electrode units cannot occur in the whole touch screen; meanwhile, the problems that the left side and the right side of the graph of the touch screen are asymmetric and the edge performance is greatly influenced due to the fact that the touch screen is provided with the wiring on one side and the wiring on the other side are avoided.

Drawings

FIG. 1 is a schematic diagram of electrode distribution and lead-out wires of a single-layer multi-point capacitive touch screen in the prior art;

FIG. 2 is a schematic diagram of the electrode distribution and lead-out lines of a single-layer multi-point capacitive touch screen according to a first embodiment of the present invention;

FIG. 3 is a diagram illustrating electrode distribution and lead-out lines of a single-layer multi-point capacitive touch screen according to a second embodiment of the present invention;

FIG. 4 is a schematic diagram of an electrode distribution and lead-out line of a single-layer multi-point capacitive touch screen according to a third embodiment of the present invention;

FIG. 5 is a diagram illustrating electrode distribution and lead-out lines of a single-layer multi-point capacitive touch panel according to a fourth embodiment of the present invention;

FIG. 6 is a schematic diagram of a first variation of an electrode unit in an embodiment of the invention;

fig. 7 is a schematic diagram of a second variation of the electrode unit in the embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Before describing embodiments of the present invention in detail, technical terms used in the present invention will be explained.

The present invention will be described in detail below with reference to the drawings and various embodiments.

First embodiment

The following electrode units are arranged in parallel, a first electrode group and a second electrode group between the electrode units are arranged in parallel, first electrodes in the first electrode group are arranged in a row, and second electrodes in the second electrode group are arranged in a row. The direction in which the first and second electrodes in each electrode unit are arranged in a row is defined as a first direction, and the arrangement direction between the electrode units is defined as a second direction, so that the second direction is perpendicular to the first direction.

The term "corresponding" as used in the present invention means: the corresponding first electrode and the second electrode have an overlapping portion in the second direction.

Fig. 2 is a schematic diagram of electrode distribution and lead-out lines of a single-layer multi-point capacitive touch screen according to a first embodiment of the present invention, and referring to fig. 2, the single-layer multi-point capacitive touch screen according to the first embodiment of the present invention includes:

the number of the plurality of electrode units 40 arranged in parallel, which is shown in fig. 2, is merely an example, and the specific number of the electrode units 40 needs to be set according to actual conditions.

Each electrode unit 40 includes a first electrode group 41 and a second electrode group 42; the first electrode group 41 includes a plurality of first electrodes 43 arranged in a row, and the second electrode group 42 includes a plurality of second electrodes 44 arranged in a row; the first electrode group 41 and the second electrode group 42 are adjacent and arranged in parallel, the first electrode 43 in the first electrode group 41 and the corresponding second electrode 44 in the second electrode group 42 are adjacent and arranged correspondingly, and the first electrode 43 and the corresponding second electrode 44 form a coupling capacitance node.

Among all the electrode units 40, the first electrode 43 located at one side edge a of the electrode unit 40 corresponds to only one second electrode 44, and the remaining first electrodes 43 correspond to two second electrodes 44 respectively; the second electrodes 44 located at the opposite side edge B of the electrode unit 40 correspond to only one first electrode 43, and the remaining second electrodes 44 correspond to two first electrodes 43, respectively.

In order that the lead-out wires led out from the electrode unit may be located at both sides of the electrode unit, in the first embodiment, the electrodes in the first electrode group and the electrodes in the second electrode group are both divided into two types, one type is an independent electrode, and the other type is a non-independent electrode. The method specifically comprises the following steps:

the first electrode 43 in the first electrode group 41 includes: a first type of first electrode a1 and a second type of first electrode a 2. The first-type first electrodes a1 are independent from each other and are not connected, i.e. the first-type first electrode a1 is not connected with any other first electrode. Each of the second-type first electrodes a2 is connected to at least one other second-type first electrode a2, and the second-type first electrodes a2 connected to each other are not adjacent to each other. In this embodiment, except for the first electrode 43 on one side edge a and the second electrode 44 on the opposite side edge B, the remaining first electrodes 43 respectively correspond to the two second electrodes 44, and the remaining second electrodes 44 respectively correspond to the two first electrodes 43, if the mutually connected second type first electrodes a2 can be adjacent to each other, the mutually connected second type first electrodes a2 correspond to the same second electrode, so that the two coupling capacitance nodes are the same.

Such as: if the first electrode unit 40 in the first column on the left side of fig. 2 is located at the opposite side edge B, i.e. the first electrode 43 in the first row and the first electrode 43 in the second row are adjacent to each other and electrically connected to each other, the coupling capacitance nodes formed by the first electrode 43 in the first row, the first electrode 43 in the second row and the second electrode 44 in the first row are the same.

The second electrode 44 of the second electrode group 42 includes: a first-type second electrode b1 and a second-type second electrode b 2; the first-type second electrodes b1 are independent from each other and are not connected, i.e., the first-type second electrode b1 is not connected to any other second electrode 44. Each of the second-type second electrodes b2 is connected to at least one other second-type second electrode b2, and the second-type second electrodes b2 connected to each other are not adjacent to each other. The reason why the interconnected second-type second electrodes b2 are not adjacent is the same as the reason why the interconnected second-type first electrodes a2 are not adjacent.

In the first embodiment shown in fig. 2, the structures of the respective electrode units 40 are the same. The first electrode group 41 of each electrode unit 40 has 11 first electrodes 43, and the second electrode group 42 has 11 second electrodes 44.

In the first electrode group 41, the first electrodes 43 partially arranged in series are the first-type first electrodes a1, the first electrodes 43 partially arranged in series are the second-type first electrodes a2, and the first-type first electrodes a1 arranged in series and the second-type first electrodes a2 arranged in series alternately appear. In the embodiment shown in fig. 2, three first electrodes 43 arranged in series in the middle are first type first electrodes a1, and four second type first electrodes a2 arranged in series are respectively arranged on two sides of the three first type first electrodes a 1; of the four second-type first electrodes a2 on two sides, two first electrodes arranged at intervals are electrically connected together, that is, the electrode between the two second-type first electrodes a2 connected with each other is: a second type of first electrode a 2.

In the second electrode group 42, the partially continuous second electrodes 44 are the first-type second electrodes b1, the partially continuous second electrodes 44 are the second-type second electrodes b2, and the continuously arranged first-type second electrodes b1 and the continuously arranged second-type second electrodes b2 are alternately arranged. In the embodiment shown in fig. 2, two consecutive second electrodes 44 on one side of the one side edge a, three consecutive second electrodes 44 on the opposite side edge B are the first type second electrodes B1, and the remaining six consecutive second electrodes 44 are the second type second electrodes B2; three of the six second-type second electrodes b2 are connected in a spaced arrangement, and the other three are connected in a spaced arrangement, that is, the electrode between two second-type second electrodes b2 which are connected to each other is: a second type of second electrode b 2.

In the first embodiment, of all the electrode units, the partially continuously arranged first electrodes are the first-type first electrodes a1, the partially continuously arranged first electrodes 43 are the second-type first electrodes a2, and the continuously arranged first-type first electrodes and the continuously arranged second-type first electrodes are alternately arranged; the partially continuously arranged second electrodes 44 are the first-type second electrodes b1, the partially continuously arranged second electrodes 44 are the second-type second electrodes b2, and the continuously arranged first-type second electrodes and the continuously arranged second-type second electrodes alternate. In the present invention, this is not limited to the case, and it may be the case that at least one electrode unit.

It should be noted that the requirements that must be satisfied in the touch screen are: the coupling capacitance node formed by each first electrode and the corresponding second electrode needs to have uniqueness. Therefore, the coupling capacitance nodes formed by the first electrodes of the first electrode group and the second electrodes of the second electrode group are required to have uniqueness.

In each electrode unit 40, the first-type first electrode a1 is an independent first electrode, and therefore, the coupling capacitance node formed by the first-type first electrode a1 and the corresponding second electrode 44 is unique. The second-type first electrodes a2 connected together do not correspond to the same second electrode 44, and only one of the second-type first electrodes a2 connected together is opposite to one of the second-type second electrodes b2 connected together to form a coupling capacitance node, so that the coupling capacitance node formed by the second-type first electrodes a2 connected together and the corresponding second electrode 44 is unique. The second-type second electrodes b2 connected to each other do not correspond to the same first electrode 43, and only one of the second-type second electrodes b2 connected to each other is opposite to one of the second-type first electrodes a2 connected to each other to form a coupling capacitance node, so that the second-type second electrodes b2 connected to each other and the corresponding first electrodes 43 form a coupling capacitance node having uniqueness.

In the first embodiment, each of the first-type first electrodes a1 is individually connected with a lead-out wire; the second type first electrodes a2 connected together share one lead wire; each of the first-type second electrodes b1 is individually connected with a lead-out wire; the second-type second electrodes b2 connected together share one lead line. The lead lines lead out of the touch panel in the column direction, and in each electrode unit 40, the lead lines connected to the first electrodes 43 and the lead lines connected to the second electrodes 44 are located on both sides of the electrode unit 40. Outgoing lines connected with the first electrodes 43 are all led out of the touch screen along the same column direction, and outgoing lines connected with the second electrodes 44 are all led out of the touch screen along the same column direction.

Compared with the single-layer multi-point capacitive touch screen in the prior art, the single-layer multi-point capacitive touch screen in the first embodiment can reduce the number of the outgoing lines led out from each electrode unit, further solve the problem of short circuit of adjacent outgoing lines in a routing process of each electrode unit, and improve the production yield of the touch screen.

Such as: in the first embodiment shown in fig. 2, the number of the first electrodes in each electrode unit 40 is 11, the number of the second electrodes in each electrode unit is 11, and the number of the corresponding coupling capacitance nodes that can be provided is 21. In the single-layer multipoint capacitive touch screen in the prior art, if the number of coupling capacitance nodes required to be provided is 21, the number of required first electrodes is 21, one second electrode and the number of corresponding outgoing lines is 22. In the first embodiment, since the second type first electrodes a2 connected to each other share one lead wire and the second type second electrodes b2 connected to each other share one lead wire, the number of lead wires led out from each electrode unit 40 can be reduced compared with the single-layer multi-point capacitive touch screen in the prior art, the short circuit problem caused by too close distance between adjacent lead wires can be reduced, and the production yield of the touch screen can be improved.

In addition, in the embodiment, the first electrode group is provided with the first-type first electrode and the second-type first electrode, and the second electrode group is provided with the first-type second electrode and the second-type second electrode, so that the outgoing lines led out from each electrode unit can be dispersedly distributed on two sides of the electrode unit, the distance between the adjacent outgoing lines can be increased relative to the situation that the outgoing lines are basically distributed on one side of the electrode unit, the short circuit problem caused by the fact that the distance between the adjacent outgoing lines is too close can be better avoided, and the production yield of the touch screen is improved.

In addition, the outgoing lines led out from each electrode unit can be distributed on two sides of the electrode units in a scattered manner, so that the problem that the linearity, the accuracy and other performances of the touch screen are reduced due to the fact that a suspension block needs to be arranged in an area without the outgoing lines between adjacent electrode units cannot occur in the whole touch screen; meanwhile, the problems that the left and right sides of the graph are asymmetric and the edge performance is greatly influenced due to the fact that the wires are routed along one side of the touch screen and the wires are not routed on the other side of the touch screen can be solved.

In the first embodiment, the number of lead lines drawn from the first electrode group 41 is: 7. the number of lead lines drawn from the second electrode group 42 is: 7. that is, in the first embodiment, the number of lead-out lines connected to the first electrode and the number of lead-out lines connected to the second electrode are both equal in each electrode unit. The patterns of the electrodes and the patterns of the outgoing lines in the touch screen are symmetrically distributed, and the area without wiring between every two adjacent electrode units is basically avoided, so that the left and right symmetry of the patterns on the touch screen is better, and the edge performance of the touch screen is improved.

In the first embodiment, the first electrode 43 of one electrode unit 40 is located on one side of the second electrode 44, and the first electrode 43 of the other electrode unit 40 is located on the other side of the second electrode 44, of the two adjacent electrode units 40. For example, in the leftmost two electrode units 40 in fig. 2, the first electrode 43 of the left electrode unit 40 is located on the left side of the second electrode 44, and the first electrode 43 of the right electrode unit 40 is located on the right side of the second electrode 44. Therefore, the first electrode and the second electrode of the whole touch screen are arranged in mirror symmetry.

In the first embodiment, the electrode units have the same structure, and the first electrodes and the second electrodes are arranged in mirror symmetry, so that the adjacent and opposing first electrodes 43 and the adjacent and opposing second electrodes 44 at the ends in the direction opposite to the lead-out direction can share one lead-out wire. In the embodiment shown in fig. 2, the lead lines are led out of the touch screen in a direction from one side edge a to the opposite side edge B, and accordingly, the adjacent and opposite first electrodes 43 and the adjacent and opposite second electrodes 44 at one side edge a share one lead line. Therefore, the number of outgoing lines can be reduced, and the outgoing lines can be conveniently wired. Such as: in the two leftmost electrode units 40 in fig. 2, the adjacent and opposite second electrodes 44 at one side edge a share one lead-out line; in the middle two electrode units 40, the first electrodes 43 adjacent and opposing to each other at one side edge a share one lead line.

In the first embodiment, since the second-type first electrode a2 and the second-type second electrode b2 need to be connected by connecting lines, which form a "redundant" capacitor, in each electrode unit 40, an outgoing line Sref having a predetermined reference voltage is provided between the first electrode group and the second electrode group in the column direction to eliminate the "redundant" capacitor formed by the connecting lines. In addition, since capacitance is generated between the connection lines and the lead lines, and the distance between each connection line and each lead line is not equal, the capacitance generated between each connection line and each lead line is not equal, which causes non-uniform capacitance at each touch point. The outgoing line Sref can be grounded, and the corresponding preset reference voltage is zero; the predetermined reference voltage of the lead line Sref may also be a certain level signal.

In the present invention, it is not limited to providing the lead line Sref having a predetermined reference voltage led in the column direction between the first electrode group 41 and the second electrode group 42 of each electrode unit 40, and it may be provided that the lead line Sref having a predetermined reference voltage led in the column direction is provided between the first electrode group and the second electrode group of at least one electrode unit.

Second embodiment

Fig. 3 is a schematic diagram of electrode distribution and lead-out lines of a single-layer multi-point capacitive touch screen according to a second embodiment of the present invention, and referring to fig. 3, the second embodiment is different from the first embodiment in that:

the number of electrode units 50; in each electrode unit 50, the number of the first electrodes 53 and the second electrodes 54 is 12, respectively, unlike the first embodiment.

In each electrode unit 50, the first electrode 53 and the second electrode 54 have different correspondence conditions:

in each electrode unit 50, two first electrodes 53 respectively correspond to only one second electrode 54, and the other first electrodes 53 respectively correspond to two second electrodes 54; two second electrodes 54 respectively correspond to only one first electrode 53, and the other second electrodes 54 respectively correspond to two first electrodes 53; the first electrode 53 corresponding to one second electrode 54 appears in pair with the second electrode 54 corresponding to one first electrode 53; wherein a pair of first electrodes 53 and second electrodes 54 are respectively located at two opposite side edges of the electrode unit 50; the other pairs of first and second electrodes 53, 54 are located between opposite side edges, i.e., one side edge a and the opposite side edge B, of the electrode unit 50, and the first and second electrodes of each pair are located in adjacent rows.

For example, in the second embodiment shown in fig. 3, two first electrodes 53 corresponding to one second electrode 54 are: the first electrode 53 in the twelfth row, which is located at one side edge a, and the first electrode 53 in the sixth row; the two second electrodes 54 corresponding to one first electrode 53 are: the second electrode 54 positioned at the opposite side edge B, i.e., the first row, and the second electrode 54 positioned at the seventh row.

In each electrode unit 50, the distribution of the respective first-type first electrodes a1, the distribution of the respective second-type first electrodes a2, the distribution of the respective first-type second electrodes b1, and the distribution of the respective second-type second electrodes b2 are different from those of the first embodiment: the arrangement of the second electrodes in the second electrode group 52 is an inversion of the arrangement of the first electrodes in the first electrode group 51. The method specifically comprises the following steps:

in the first electrode group 51, the first electrodes 53 in the first row and the third row are the second type first electrodes a2, and a first type first electrode a1 is arranged between the first electrodes and the third row; the first electrodes 53 in the eighth and tenth rows are the second type first electrodes a2, and there is one first type first electrode a1 in between; the remaining first electrodes 53 are first-type first electrodes a 1.

In the second electrode group 52, the second electrodes 54 in the third row and the fifth row are second-type second electrodes b2, and a first-type second electrode b1 is arranged between the second-type second electrodes b 2; the second electrodes in the tenth and twelfth rows are second-type second electrodes b2, and a first-type second electrode b1 is arranged between the second electrodes; the remaining second electrodes 54 are the first type second electrodes b 1.

In the second embodiment, the first type of first electrodes are arranged between two second type of first electrodes which are connected with each other, and the number of the first type of first electrodes is 1; the first type second electrodes are arranged between the two second type second electrodes which are mutually connected, and the number of the second type second electrodes is 1. However, in the present invention, the number of the first-type first electrodes between the two second-type first electrodes connected to each other is not limited, and the number of the first-type second electrodes between the two second-type second electrodes connected to each other is not limited, and may be determined according to actual requirements.

In the second embodiment, the lead-out lines of each electrode unit 50 lead out of the touch panel in two opposite directions of the column direction, respectively. Lead-out lines connected to some of the first electrodes 53 lead out of the touch panel in one of the column directions, and lead-out lines connected to the remaining first electrodes 53 lead out of the touch panel in the other of the column directions; lead lines to some of the second electrodes 54 lead out of the touch panel in one of the column directions, and lead lines to the remaining second electrodes 54 lead out of the touch panel in the other of the column directions. The partial first electrodes are all positioned on the same side of the rest first electrodes, namely, the first electrodes connected with the outgoing lines extending in the same direction are continuously arranged; the partial second electrodes are all positioned on the same side of the rest of the second electrodes, namely, the second electrodes connected with the outgoing lines extending in the same direction are continuously arranged. The method specifically comprises the following steps:

the outgoing lines of the first and second electrodes of the first to sixth rows in each electrode unit 50 lead out of the touch panel in one of the column directions, and the outgoing lines of the first and second electrodes of the seventh to twelfth rows lead out of the touch panel in the other of the column directions.

In the second embodiment, the number of first electrodes connected to the lead lines extending in one direction is equal to the number of first electrodes connected to the lead lines extending in the other direction, and the first electrodes connected to the lead lines extending in the same direction are continuously distributed; the number of second electrodes connected to the lead lines extending in one direction is equal to the number of second electrodes connected to the lead lines extending in the other direction, and the second electrodes connected to the lead lines extending in the same direction are continuously distributed.

In the present invention, when the lead lines of one electrode unit are led out in two directions of the column direction, the number of first electrodes connected to the lead lines extending in one direction and the number of first electrodes connected to the lead lines extending in the other direction may not be equal to each other, and the first electrodes connected to the lead lines extending in the same direction may also be distributed discontinuously; the number of the second electrodes connected to the lead lines extending in one direction and the number of the second electrodes connected to the lead lines extending in the other direction may not be equal to each other, and the second electrodes connected to the lead lines extending in the same direction may be discontinuously distributed.

In the second embodiment, among the first electrodes connected with the leading-out lines extending along the same direction, the adjacent and opposite first electrodes farthest from the end of the touch screen share one leading-out line; and the second electrodes which are connected with the leading lines extending along the same direction share one leading line, wherein the adjacent second electrodes which are opposite to each other and are farthest from the end part of the touch screen. Such as: in the leftmost two electrode units 40 in fig. 5, the sixth row of adjacent and opposing second electrodes 44 share one lead line, and the seventh row of adjacent and opposing second electrodes 44 share one lead line.

In the second embodiment, the number of lead-out lines drawn out in the column direction from both sides of each electrode unit is also equal.

The second embodiment has the same advantages as the first embodiment, and will not be described herein.

Third embodiment

Fig. 4 is a schematic diagram of electrode distribution and lead-out lines of a single-layer multi-point capacitive touch screen according to a third embodiment of the present invention, and referring to fig. 4, the third embodiment is different from the first embodiment in that:

the number of electrode units 60.

In each electrode unit 60, the distribution of the respective first-type first electrodes a1, the distribution of the respective second-type first electrodes a2, the distribution of the respective first-type second electrodes b1, and the distribution of the respective second-type second electrodes b2 are different from those of the first embodiment:

in the first electrode group 61, the first electrodes 63 in the first row and the third row are the second type first electrodes a2, and a first type first electrode a1 is arranged between the first electrodes and the third row; the remaining first electrodes 63 are first-type first electrodes a 1.

In the second electrode group 62, the second electrodes 64 in the third row and the fifth row are second-type second electrodes b2, and a first-type second electrode b1 is arranged between the second electrodes; the remaining second electrodes 64 are the first-type second electrodes b 1.

In the third embodiment, the first-type first electrodes a1 are arranged between two second-type first electrodes a2 which are connected with each other, and the number of the first-type first electrodes a1 is 1; between the two second type second electrodes b2 connected with each other are the first type second electrodes b1, and the number is 1. However, in the present invention, the number of the first-type first electrodes between the two second-type first electrodes connected to each other is not limited, and the number of the first-type second electrodes between the two second-type second electrodes connected to each other is not limited, and may be determined according to actual requirements.

In the third embodiment, the lead-out lines of each electrode unit 60 lead out of the touch panel in two opposite directions of the column direction, respectively, as in the second embodiment; the first electrodes which are connected with the outgoing lines extending along the same direction, adjacent first electrodes which are opposite to each other and farthest from the end part of the touch screen share one outgoing line; and the second electrodes which are connected with the leading lines extending along the same direction share one leading line, wherein the adjacent second electrodes which are opposite to each other and are farthest from the end part of the touch screen.

Unlike the second embodiment, the lead-out lines of the first and second electrodes of the first to sixth rows in each electrode unit 60 lead out of the touch panel in one of the column directions, and the lead-out lines of the first and second electrodes of the seventh to eleventh rows lead out of the touch panel in the other of the column directions, depending on the number of electrodes in each electrode unit.

In the third embodiment, the number of lead-out lines drawn out from both sides of each electrode unit along the column is also equal.

The third embodiment has the same advantages as the first embodiment, and will not be described herein.

Fourth embodiment

Fig. 5 is a schematic diagram of electrode distribution and lead-out lines of a single-layer multi-point capacitive touch screen according to a fourth embodiment of the present invention, and referring to fig. 5, the fourth embodiment is different from the first embodiment in that:

the number of the electrode units 70, and the number of the first electrodes 73 and the second electrodes 74 in each of the electrode units 70.

In the whole touch screen, the first electrodes 73 and the second electrodes 74 are arranged in an array, specifically: in all electrode units, the first electrode 73 is located on the same side as the second electrode 74. In the fourth embodiment shown in fig. 7, in each electrode unit 70, the first electrode 73 is positioned on the left side of the corresponding second electrode 74.

In each electrode unit 70, the distribution of the respective first-type first electrodes a1, the distribution of the respective second-type first electrodes a2, the distribution of the respective first-type second electrodes b1, and the distribution of the respective second-type second electrodes b2 are different from those of the first embodiment:

in the first electrode group 71, the first electrodes 73 in the third to sixth rows are the first electrodes a2 of the second type, wherein the first electrodes 73 in the third and fifth rows are connected together, and the first electrodes 73 in the fourth and sixth rows are connected together, so that one first electrode a2 of the second type is arranged between the two first electrodes a2 of the second type connected together; the remaining first electrodes 73 are first-type first electrodes a 1.

In the second electrode group 72, the second electrodes 74 in the first to fourth rows are the second type second electrodes b2, wherein the second electrodes 74 in the first and third rows are connected together, and the second electrodes 74 in the second and fourth rows are connected together, so that one second type second electrode b2 is arranged between the two second type second electrodes b2 connected together; the remaining second electrodes 74 are the first-type second electrodes b 1.

In the fourth embodiment, between two adjacent electrode units 70, a lead line Sref having a predetermined reference voltage is provided extending in the column direction. The lead-out wire Sref has the functions that: and an outgoing line connected with the first electrode and an outgoing line connected with the second electrode are isolated. In the fourth embodiment, the number of lead-out lines drawn out from both sides of each electrode unit along the column is also equal.

The fourth embodiment has the same advantages as the first embodiment, and will not be described herein.

In the first, second, third and fourth embodiments, the structures of the electrode units are the same, but in the present invention, the structures of the electrode units may be different.

In the first, second, third and fourth embodiments, only one first electrode corresponds to one second electrode, one second electrode corresponds to one first electrode, the rest of the first electrodes correspond to two second electrodes, and the rest of the second electrodes correspond to two first electrodes. In the present invention, the cases exemplified in the above embodiments are not limited as long as: each of at least some of the first electrodes may correspond to at least two of the second electrodes.

For example: referring to fig. 6, in the electrode unit 80 located on the left side, each of the first electrodes 83 of the first electrode group 81 corresponds to two second electrodes 84. In the electrode unit 80 on the right side, each first electrode 83 of the first electrode group 81 corresponds to one second electrode 84, two second electrodes, three second electrodes 84, and four second electrodes 84.

In the invention, in each electrode unit, the coupling capacitance node formed by each first electrode and the corresponding second electrode needs to meet the requirement of uniqueness. In the first, second, third and fourth embodiments, only one of the second type of mutually connected first electrodes corresponds to one of the second type of mutually connected second electrodes, the second type of mutually connected first electrodes correspond to different second electrodes, and the second type of mutually connected second electrodes correspond to different first electrodes, so as to satisfy the requirement that the coupling capacitance node has uniqueness.

In the invention, in order to meet the requirement that the coupling capacitance node has uniqueness: for example, referring to fig. 7, in the electrode unit 90, the second type first electrodes a2 connected to each other and the second type second electrodes b2 connected to each other in the first electrode group 91 are staggered from each other without corresponding portions, the second type first electrodes a2 connected to each other correspond to different second electrodes 94, and the second type second electrodes b2 connected to each other correspond to different first electrodes 93. Wherein the second type first electrodes a2 in the first electrode group 91 are located in the sixth to tenth rows, and the second type first electrodes a2 in the second electrode group 92 are located in the first and fourth rows, so that the second type first electrodes a2 connected to each other in the first electrode group 91 and the second type second electrodes b2 connected to each other are staggered with no corresponding portion.

In the first and fourth embodiments, one second-type first electrode is disposed between two second-type first electrodes connected to each other, and one second-type second electrode is disposed between two second-type second electrodes connected to each other. In the second and third embodiments, a first-type first electrode is disposed between two second-type first electrodes connected to each other, and a first-type second electrode is disposed between two second-type second electrodes connected to each other. In the present invention, the electrodes between the two second-type first electrodes connected to each other are not limited to the above, for example: referring to fig. 7, it may also be: two first electrodes a2 of the second type are arranged between the first electrodes a2 of the seventh row and the second type of the tenth row which are connected with each other, and a first electrode a2 of the second type and a first electrode a1 of the first type are arranged between the first electrodes a2 of the ninth row and the twelfth row which are connected with each other.

In the present invention, the electrodes between the second-type first electrodes connected to each other are not limited to the above, as long as the following conditions are satisfied: the electrode positioned between the two second type first electrodes which are mutually connected is the second type first electrode, or the second type first electrode; alternatively, a first type of first electrode and a second type of first electrode are included. Similarly, the electrode between the two second type second electrodes which are connected with each other is the first type second electrode; or, a second type of second electrode; alternatively, a first type of second electrode and a second type of second electrode are included.

In the first, second, third, and fourth embodiments, the lead lines led out from the electrode units lead out the touch panel in the column direction, but in the present invention, the lead lines led out from the electrode units may also lead out the touch panel in the row direction.

In the first, second, third, and fourth embodiments, the number of lead lines drawn from the first electrode is equal to the number of lead lines drawn from the second electrode in each electrode unit, but the present invention is not limited to the case described in the first, second, third, and fourth embodiments, and may be: the number of the lead-out wires led out from the first electrode is different from that of the lead-out wires led out from the second electrode by one or more. When the difference is one, the patterns of the electrodes and the outgoing lines in the touch screen are also basically distributed symmetrically, and the area without wiring between two adjacent electrode units is basically avoided, so that the problem in the prior art can be better solved.

In the above first, second, third and fourth embodiments, each of the first electrodes in the first electrode groups and each of the second electrodes in the second electrode groups in each electrode unit satisfies the following condition:

each of at least some of the first electrodes and at least two second electrodes;

the first electrode of the first electrode group includes: a first type of first electrode and a second type of first electrode; the first electrodes of the first type are independent of each other and are not connected; each of the second-type first electrodes is connected with at least one other second-type first electrode, and the second-type first electrodes which are connected with each other are not adjacent;

However, in the present invention, it is not limited that each electrode unit satisfies the above conditions, and as long as one of the electrode units satisfies the above conditions, the problems of the related art can be solved to some extent.

For the electrode unit meeting the conditions, compared with the existing single-layer multi-point capacitive touch screen, the number of electrodes in the electrode unit can be reduced, and the number of outgoing lines led out from the electrode unit can be correspondingly reduced, so that the problem of short circuit of adjacent outgoing lines of the electrode unit in a routing process can be solved, and the production yield of the touch screen is improved.

Moreover, the first electrode and the second electrode in the electrode unit are divided into two types: the first-type first electrodes are independent and not connected with each other, each of the second-type first electrodes is connected with at least one other second-type first electrode, and the second-type first electrodes which are connected with each other are not adjacent; the first type second electrodes are independent and not connected with each other, each of the second type second electrodes is connected with at least one other second type second electrode, and the second type second electrodes which are connected with each other are not adjacent; therefore, when the electrode unit is wired, the outgoing lines can be distributed on two sides of the electrode unit, and the problem that the linearity, accuracy and other performances of the touch screen are reduced due to the fact that a suspension block needs to be arranged in an area without the outgoing lines between the electrode unit and an adjacent electrode unit is solved. Moreover, compared with the situation that the outgoing lines are basically distributed on one side of the electrode unit, the outgoing lines are distributed on two sides of the electrode unit, so that the distance between the adjacent outgoing lines can be further increased, the problem of short circuit caused by too short distance between the adjacent outgoing lines is better avoided, and the production yield of the touch screen is improved.

The electrode units positioned on the outer side of the touch screen are electrode units meeting the above conditions, so that the problems that the left and right sides of the graph are asymmetric and the edge performance is greatly influenced due to the fact that one side of the touch screen is provided with the wiring and the other side of the touch screen is not provided with the wiring can be solved.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A single-layer multipoint capacitive touch screen is characterized by comprising a plurality of electrode units which are arranged in parallel, wherein each electrode unit comprises a first electrode group and a second electrode group; the first electrode group comprises a plurality of first electrodes arranged in a row, and the second electrode group comprises a plurality of second electrodes arranged in a row; the first electrode group and the second electrode group are adjacent and arranged in parallel, a first electrode in the first electrode group is adjacent and correspondingly arranged with a corresponding second electrode in the second electrode group, and the first electrode and the corresponding second electrode form a coupling capacitance node;

wherein, in at least one electrode unit:

2. The single-layer multi-touch capacitive touch screen of claim 1 wherein the electrodes between two first electrodes of the second type that are connected to each other are: a first electrode of a first type; or, a second type of first electrode; alternatively, a first type of first electrode and a second type of first electrode are included.

3. The single-layer multi-point capacitive touch screen of claim 1, wherein the electrodes between two second-type second electrodes that are connected to each other are: a first-type second electrode; or, a second type of second electrode; alternatively, a first type of second electrode and a second type of second electrode are included.

4. The single-layer multi-point capacitive touch screen of claim 1, wherein one of the at least one electrode unit is an outer electrode unit.

5. The single-layer multi-touch capacitive touch screen of claim 1, wherein in the at least one electrode unit:

6. The single-layer multi-touch capacitive touch screen of claim 1, wherein in the at least one electrode unit:

7. The single-layer multi-touch capacitive touch screen of claim 1, wherein in the at least one electrode unit:

8. The single-layer multi-point capacitive touch screen of any of claims 1-7, wherein the plurality of electrode units are identical in structure.

9. The single-layer multi-point capacitive touch screen of any of claims 1-7, wherein each of the first electrodes of the first type is individually connected to a lead-out wire;

10. The single-layer multi-drop capacitive touch screen of claim 9, wherein the pinout leads out of the touch screen in a column direction or in a row direction.

11. The single-layer multi-point capacitive touch panel as recited in claim 9, wherein the lead lines are led out of the touch panel in a column direction, and in each electrode unit, the lead line connected to the first electrode and the lead line connected to the second electrode are respectively located at both sides of the electrode unit.

12. The single-layer multi-point capacitive touch screen of claim 11, wherein the lead lines connected to the first electrodes are all led out of the touch screen in the same column direction; or leading out wires connected with part of the first electrodes out of the touch screen along one direction of the column direction, and leading out wires connected with the rest of the first electrodes out of the touch screen along the other direction of the column direction;

13. The single-layer multi-drop capacitive touch screen of claim 12 wherein the portions of the first electrodes are all located on the same side of the remaining first electrodes; the part of the second electrodes are all positioned on the same side of the rest of the second electrodes.

14. The single-layer multi-touch capacitive touch panel of claim 9, wherein the number of lead-out lines connected to the first electrode and the number of lead-out lines connected to the second electrode in at least one electrode unit are equal to or different from each other.

15. The single-layer multi-point capacitive touch screen of claim 9, wherein at least one of the electrode units has a predetermined reference voltage lead-out line led out in a column direction between the first electrode group and the second electrode group.

16. The single-layer multi-spot capacitive touch panel of claim 9, wherein a lead line having a predetermined reference voltage is provided between at least two adjacent electrode units.

17. The single-layer multi-point capacitive touch screen of any of claims 1-7, wherein the first electrodes are located on the same side of the second electrodes in all of the electrode units; or,