CN103105990B - Individual layer capacitive touch screen and touch control terminal - Google Patents

Abstract

The present invention relates to the field of touch technology, and provides a single-layer capacitive touch sensor, wherein the single-layer capacitive touch sensor includes a substrate, and a first electrode and a second electrode are arranged on the substrate, and the first electrode and the second electrode The electrodes are all in the form of metal grids. The present invention also provides a touch terminal at the same time, and the touch terminal adopts the aforementioned capacitive touch sensor. Compared with the traditional ITO capacitive touch sensor, the single-layer capacitive touch sensor of the present invention adopts metal grid electrodes, which greatly reduces the impedance of the touch sensor electrodes, overcomes the defects of tailing and wiring interference caused by high impedance, and reduces The signal attenuation of the touch sensor is improved, and the consistency of the sensitivity of the touch sensor is improved; further, compared with the traditional ITO capacitive touch sensor, the metal grid-shaped capacitive touch sensor of the present invention can support a higher frequency drive signal, which overcomes the ITO Capacitive touch sensor has the defect of large low-frequency signal interference.

Description

Single layer capacitive touch sensor and touch terminal

【Technical field】

The invention relates to the field of touch technology, in particular to a single-layer capacitive touch sensor and a touch terminal.

【Background technique】

Traditional capacitive touch sensors usually require a multi-layer conductive material structure. Although some are only realized with a single-layer conductive material structure, jumpers need to be added at the intersection of the X direction and the Y direction to form two dimensions of X and Y that cross each other. The network, which requires the electrodes of one dimension to be designed as a jumper structure on the electrodes of the other dimension. Jumpers made of conductive materials, this kind of wiring is very complicated and requires high process precision. In addition, the existing capacitive touch sensors usually use ITO (Indium-TinOxide, indium tin oxide, commonly referred to as transparent conductive film) as the conductive material, which has better light transmission. However, this material also has certain defects, that is, its impedance is relatively high. Therefore, how to provide a single-layer capacitive touch sensor with simple structure, easy processing and low impedance is an urgent problem to be solved at present.

【Content of invention】

The invention provides a single-layer capacitive touch sensor, aiming to solve the technical problem of high structural impedance of the existing capacitive touch sensor.

The present invention adopts following technical scheme:

A single-layer capacitive touch sensor includes a substrate, on which a first electrode and a second electrode are arranged, and the first electrode and the second electrode are both in the shape of a metal grid.

The present invention also provides a touch terminal, which adopts the capacitive touch sensor mentioned above.

The beneficial effects of the present invention are:

By designing both the first electrode and the second electrode as a metal grid, compared with the traditional ITO capacitive touch sensor, the impedance of the touch sensor electrode is greatly reduced, thus solving the problems of tailing and wiring interference caused by high impedance , while reducing the signal attenuation of the touch sensor and improving the sensitivity consistency of the touch sensor; furthermore, compared with the traditional ITO capacitive touch sensor, this metal grid-shaped capacitive touch sensor can support a higher frequency driving signal, which solves the problem of The signal interference problem that ITO capacitive touch sensor is difficult to solve.

【Description of drawings】

FIG. 1 is a schematic diagram of wiring of a single-layer capacitive touch sensor provided by Embodiment 1 of the present invention;

Fig. 2 is a schematic diagram of the first electrode, the second electrode and their occlusion in Embodiment 1 of the present invention;

Fig. 3 is the enlarged schematic diagram of part A in Fig. 1;

Fig. 4 is the enlarged schematic diagram of part B in Fig. 1;

Figure 5 is an enlarged schematic view of part C in Figure 3;

FIG. 6 is a partially enlarged schematic diagram of the wiring of the single-layer capacitive touch sensor provided by Embodiment 2 of the present invention.

Reference signs:

The first electrode 1, the first electrode block 11,

The first electrode extension 111, the second electrode 2,

the second electrode unit 21, the second electrode block 211,

the second electrode extension part 2111, the second electrode trace 22,

Floating block 3, touch terminal 4.

【detailed description】

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

An embodiment of the present invention provides a single-layer capacitive touch sensor, which includes a substrate, on which a first electrode and a second electrode are arranged, and the first electrode and the second electrode are both in the shape of a metal grid.

An embodiment of the present invention also provides a touch terminal, which adopts the above-mentioned capacitive touch sensor.

In the embodiment of the present invention, both the first electrode and the second electrode are designed as a metal grid, which greatly reduces the impedance of the touch sensor electrode compared with the solid block electrode structure using ITO in the prior art, thereby solving the problem of high impedance. The problems such as smearing and wiring interference caused by it can reduce the signal attenuation of the touch sensor and improve the sensitivity consistency of the touch sensor; furthermore, compared with the traditional ITO capacitive touch sensor, this metal grid capacitive touch sensor can It supports higher frequency drive signals and solves the signal interference problem that ITO capacitive touch sensors are difficult to solve.

The embodiment of the present invention does not require special design for the trace width of the second electrode, and does not need to set a floating block between the first electrode extension part and the second electrode extension part, or at least between the first electrode extension part and the second electrode extension part. The area between the extension parts, and/or the wiring area of the second electrode, and/or the area between the saturation surfaces of two adjacent first electrodes are filled with independent metal grid-like suspensions that are not connected to each other. block, the structure of the whole sensor is simpler and easier to process.

Example 1:

Embodiment 1 of the present invention provides a single-layer capacitive touch sensor. As shown in FIG. 1 , this embodiment takes the application of the single-layer capacitive touch sensor on a mobile phone as an example for illustration. Of course, the single-layer capacitive touch sensor provided in this embodiment can also be applied to other touch terminals, such as tablet computers, various self-service terminals, and the like.

As shown in Figures 1 to 3, the single-layer capacitive touch sensor has several columns of first electrodes 1 arranged along the first direction and several rows of second electrodes 2 arranged along the second direction on the substrate. wires and the second electrode traces 22 are led out to a flexible printed circuit board (Flexible Printed Circuit, FPC) bound to the substrate (not shown in the figure). In this embodiment, the first direction is a vertical direction, and the second direction is a horizontal direction.

As shown in FIGS. 1 to 3 , the first electrode 1 includes a first electrode block 11 arranged along the first direction, and on the same side of the first electrode block 11 , the first electrode block 11 is used as a starting point to extend several times toward the second direction. In the first electrode extension portion 111 , the first direction is perpendicular to the second direction. The second electrode 2 of each row includes a second electrode unit 21 whose number is equal to that of the first electrode 1 column; the second electrode unit 21 includes a second electrode block 211 arranged along the first direction. A plurality of second electrode extensions 2111 are extended from the second electrode block 211 to the opposite direction of the second direction, and the second electrode extensions 2111 are engaged with the first electrode extensions 111 . Preferably, the number of the second electrode extensions 2111 of each second electrode unit 21 is 3-5, and there are 4 in this embodiment. The distance between the first electrode extension part 111 and the second electrode extension part 2111 is greater than or equal to 0.1 mm and less than or equal to 0.3 mm.

The occlusal position of the first electrode extension 111 and the second electrode extension 2111 forms a capacitive structure, with the first electrode 1 as the sensing electrode (electrically connected to RX), and the second electrode 2 as the driving electrode (electrically connected to TX) as For example, the first electrode extension 111 can sense the change of charge on the second electrode extension 2111 in real time, and single-layer touch detection can be realized without jumping wires. In FIG. 1 , the sensing electrodes and the driving electrodes are arranged back-to-back in the horizontal direction as "driving-sensing-sensing-driving-driving-sensing-sensing-driving..." among similar electrodes. As shown in Figure 3 and Figure 5, a floating block 3 is provided in the area between the wiring area of the second electrode and the saturation surface of two adjacent first electrodes 1 to maintain the flatness and smoothness of the entire substrate wiring. The overall light transmittance, where the floating block 3 refers to the electrically independent metal wire without any wiring connection, and the saturated surface refers to the completely smooth side of the electrode. The area between the saturation planes of the first electrode 1 has no wires at all. In the single-layer conductive material structure of this embodiment, the two electrodes are designed in the shape of a occlusion, and the capacitive structure is formed through the occlusion, without the need to design a jumper, which simplifies the wiring and reduces the impact on the process conditions to a certain extent. Requirements, simple structure, easy processing.

As shown in FIG. 3 and FIG. 4 , the area between the first electrode extension 111 and the second electrode extension 2111 also has a suspension block 3 , the first electrode block 11 in FIG. 3 , the first electrode extension 111 , The second electrode block 211 , the second electrode extension 2111 , the suspension block 3 and the gaps between the suspension blocks 3 constitute a complete touch detection node. One of the functions of the suspension block 3 is to cause the electric field between the driving and sensing to diverge more, which is beneficial to touch changes; the second function is to effectively reduce the total area of the driving and sensing of the node part, and pass the sensing through the finger under the suspension condition. The interference signal becomes smaller.

As shown in FIG. 3 and FIG. 4 , the first electrode 1 and the second electrode 2 are in the form of metal grids. In this embodiment, both the first electrode 1 and the second electrode 2 are made of nano-silver, in the form of a rhombus grid. In other embodiments, the first electrode 1 and the second electrode 2 can also be made of other metal materials , and render meshes of other shapes, such as squares, triangles, and so on. The material of the suspension block 3 and all the wires in the sensor (such as the first electrode wire and the second electrode wire 22 ) can also be made of the same material as the first electrode 1 and the second electrode 2 , such as nano-silver. The suspension block 3 is an independent metal mesh suspension block 3 not connected to each other. Since the metal grid-shaped single-layer capacitive touch sensor is manufactured by using the nano-silver process, compared with the method using ITO, the impedance of the metal grid-shaped nano-silver is low, and no specific design is required for the width of the second electrode trace 22. For example, the width of all traces of the second electrode can be the same, but in a sensor using ITO, due to the high impedance of ITO, the traces of the second electrode at the lower end of the sensor need to be widened to reduce the impedance. Moreover, as shown in FIG. 4 and FIG. 5 , the area between the first electrode extension 111 and the second electrode extension 2111 , the wiring area of the second electrode and the saturation surface of two adjacent first electrodes 1 The suspension blocks 3 in the region can be independent metal grid-like suspension blocks 3 that are not connected to each other. Compared with the ITO method, the structure of the entire sensor is simpler and easier to process.

As shown in Figures 1 to 3, this embodiment adopts a double-sided outlet method. If the upper bottom is selected as the IC position, then the driving line (ie, the second electrode wiring 22) coming out of the lower bottom needs to pass through the two sides. The trace leads to the upper end. This embodiment adopts a wiring structure in which the upper and lower bottom edges are bound to FPCs. The FPCs are used to short-circuit the second electrode units 21 in each row of the second electrodes 2 together, and are also used to lead the second electrodes 2 to the The detection circuit needs to be jumpered when it is shorted. This can be jumpered on the FPC or on the substrate. The second electrode trace 22 is drawn to the corresponding FPC to the upper and lower bottom edges of the substrate. The second Both sides of the electrode trace 22 are adjacent to the second electrode 2 , and the second electrode trace 22 is completely located on the saturation surface of the second electrode 2 . The second electrode 2 isolates all its wiring from the first electrode 1, and can be grounded when not scanning, so the electric field between the second electrode wiring 22 and the first electrode 1 is completely absorbed by the middle second electrode block 21 , the mutual capacitance is zero, and the wiring has no interference data at all when touching the wiring area. At the same time, the FPC bound to the upper and lower bottom sides can arrange the second electrode wiring 22 on the upper and lower sides. Compared with the single-side wiring method, in the same size wiring area, the second electrode wiring of the double-sided wiring method The number of 22 can be doubled, improving the linearity. As shown in FIG. 3 , in this embodiment, both the first electrode extension 111 and the second electrode extension 2111 have a rectangular structure. One function of the rectangular symmetrical bite is to make the distribution of node capacitance more uniform and increase the effective area of touch. Mutual capacitance between lines.

Example 2:

Embodiment 2 of the present invention also provides a single-layer capacitive touch sensor. The difference between this embodiment and Embodiment 1 lies in that in this embodiment, no floating block is provided in the area between the first electrode extension part and the second electrode extension part. Only the parts of this embodiment that are different from Embodiment 1 will be described below, and the remaining parts are similar to Embodiment 1, and will not be repeated here.

As shown in FIG. 6 , there is no floating block in the area between the first electrode extension 111 and the second electrode extension 2111 , so that the structure of the whole sensor is simpler and easier to process. Similar to Embodiment 1, the floating blocks 3 in the area between the wiring area of the second electrode and the saturation surface of two adjacent columns of the first electrodes 1 are independent floating blocks 3 that are not connected to each other.

Example 3:

Embodiment 3 of the present invention provides another single-layer capacitive touch sensor. The difference between this embodiment and Embodiment 1 is that the substrate has only one bottom edge bound to the FPC, which can be the upper bottom edge or the lower bottom edge, preferably the upper bottom edge, and the second electrode traces are led out to the FPC. Same as Embodiment 1, both sides of the traces of the second electrode are adjacent to the second electrode, and the second electrode isolates all its traces from the first electrode, and the traces do not generate any interference data when touching the trace area. The best effect of this single-side outlet method can be adapted to 100ohm.

Example 4:

Embodiment 4 of the present invention provides a touch terminal. As shown in FIG. 1 , the touch terminal 4 adopts the capacitive touch sensor provided by any one of Embodiment 1 to Embodiment 3. In this embodiment, the touch terminal 4 is a mobile phone, of course, it can also be other types of touch terminals, such as a tablet computer, various self-service terminals and the like.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (7)

1. A single-layer capacitive touch sensor, comprising a substrate, on which a first electrode and a second electrode are arranged, and it is characterized in that, the first electrode and the second electrode are metal grids; The first electrode includes a first electrode block arranged along a first direction, and on the same side of the first electrode block starting from the first electrode block, several first electrode extensions extend toward the second direction, so The first direction is perpendicular to the second direction; the second electrode includes a second electrode block arranged along the first direction, on the same side of the second electrode block starting from the second electrode block to the A plurality of second electrode extensions are extended in the opposite direction of the second direction, and the second electrode extensions are engaged with the first electrode extensions; The distance between the first electrode extension part and the second electrode extension part is greater than or equal to 0.1mm and less than or equal to 0.3mm; the upper and lower bottom edges of the substrate are bound with flexible printed circuit boards, and the second The traces of the electrodes are drawn to the corresponding flexible printed circuit boards to the upper and lower bottom edges of the substrate nearby, and both sides of the traces of the second electrodes are adjacent to the second electrodes, and the second electrodes connect all the traces of the second electrodes. The wiring is isolated from the first electrode, and the wiring of the second electrode is grounded when not scanning. 2. The single-layer capacitive touch sensor according to claim 1, characterized in that at least the area between the first electrode extension and the second electrode extension, and/or the second electrode The wiring area, and/or the area between two adjacent saturation surfaces of the first electrodes is filled with floating blocks. 3 . The single-layer capacitive touch sensor according to claim 2 , wherein the suspension blocks are independent metal mesh-like suspension blocks not connected to each other. 4 . 4. The single-layer capacitive touch sensor according to claim 3, wherein the first electrode, the second electrode, the wiring of the first electrode, the wiring of the second electrode and the floating block are all made of nano-silver become. 5 . The single-layer capacitive touch sensor according to claim 1 , wherein both the first electrode extension and the second electrode extension are rectangular structures. 6 . The single-layer capacitive touch sensor according to claim 1 , wherein the first electrode is a sensing electrode, and the second electrode is a driving electrode. 7. A touch terminal, characterized in that the touch terminal adopts the capacitive touch sensor according to any one of claims 1-6.