WO2017132781A1

WO2017132781A1 - Capacitive touch control sensing device controlled using logic circuit

Info

Publication number: WO2017132781A1
Application number: PCT/CN2016/000106
Authority: WO
Inventors: 郑健青; 胡继承
Original assignee: 郑健青
Priority date: 2016-02-01
Filing date: 2016-03-04
Publication date: 2017-08-10
Also published as: CN107026640A

Abstract

A capacitive touch control sensing device controlled using a logic circuit. The device comprises a cover plate (1) provided with several key regions, and a capacitive sensing layer (2), a line layer (3) and a touch key circuit are successively stacked under the key regions; the touch key circuit contains a capacitive measurement circuit (4) and a logic control circuit (5); and a ground line (8) and a signal line (7) capacitively drawn from the capacitive sensing layer (2) are respectively connected to a ground line and a respective signal line of the line layer (3), the corresponding signal line and a parallel identification line of the line layer (3) are connected to an input pin of a chip TCH of the capacitive measurement circuit (4), a signal output pin of the chip TCH and an identification line output pin of the capacitive measurement circuit (4) are connected to a signal output pin and an identification line input pin of a logic module chip of the logic control circuit (5), and the signal output pin of the logic module chip of the logic control circuit (5) is connected to a central processor of the line layer (3). The touch control sensing device can filter an incorrect sensing state by means of sensing states of a logic circuit processing signal line and an identification line thereof so as to increase contact intensity.

Description

Capacitive touch sensing device controlled by logic circuit

Technical field:

The present invention relates to a touch technology, and more particularly to a capacitive touch sensing device controlled by a logic circuit.

Background technique:

As one of the touch sensing devices, the capacitive touch sensing button has been widely used. At present, two problems are caused in the manufacture and use of the conventional capacitive touch sensing buttons. One is the false sensing caused by the large parasitic capacitance between the signal lines. In order to avoid such problems, it is usually necessary to adjust the sensitivity of the capacitive sensing and limit The method of connecting the wires is not very satisfactory. Another problem is the mis-touch of the non-target touch sensing area. To avoid false touches, it is necessary to limit the minimum spacing between different touch sensing buttons. However, this practice also limits the number of contacts in a certain area. These two problems have seriously affected the application prospects of technology. Therefore, we must try to eliminate the effects of parasitic capacitance, stray capacitance, and sidelobe capacitance.

Summary of the invention:

The object of the present invention is to provide a capacitive touch sensing device with simple structure and effective avoidance of false triggering by using logic circuit control in view of the deficiencies of the prior art.

The object of the present invention is achieved by the following measures: a capacitive touch sensing device controlled by a logic circuit, comprising a cover plate provided with a plurality of button regions, wherein a capacitive sensing layer and a circuit layer are sequentially stacked under the button region, The capacitive sensing layer is composed of an upper conductive ink layer, an intermediate insulating layer and a lower conductive ink layer, wherein the circuit layer comprises a power source, a ground line and a central processor, and is characterized in that a touch button circuit is further provided; The touch button circuit includes a capacitance measuring circuit and a logic control circuit; the two ends of the capacitor of the capacitive sensing layer respectively lead to a ground line and a signal line, and the ground line and the signal line are coiled outward from the center in the button area. And after being filled with the button area, respectively, are drawn from the diagonal of the button area, and the circuit layer is provided with a corresponding signal line and an identification line of the same capacitance arranged in parallel with the signal line in the corresponding non-key area, the capacitive sensing layer The ground and signal lines drawn by the capacitor are respectively connected to the ground line of the circuit layer and the corresponding signal line, and the signal line corresponding to the circuit layer and the parallel identification line are connected to the input pin of the chip TCH of the capacitance measuring circuit, and the capacitance measurement is performed. The signal output pin of the circuit chip TCH, the identification line output pin is connected with the signal input pin of the chip of the logic control circuit, the identification line input pin, the signal output pin of the chip of the logic control circuit and the center of the circuit layer The processor is connected.

The chip of the capacitance measuring circuit is TCH601.

The chip is connected with a measurement reference capacitor C for detecting the pin C AP IN of the TCH601 and the pin C AP OUT , and the capacitance of the measurement reference capacitor C is 400 to 4000 times of the corresponding capacitance of the capacitive sensing layer.

The logic module chip of the logic control circuit includes a non-AND gate and a NOT gate logic gate circuit.

Compared with the prior art, the capacitive touch sensing device controlled by the logic circuit proposed by the invention has the following advantages: 1) the grounding wire and the signal wire are respectively taken out from the two ends of the capacitor, starting from the center in the button zone. After being coiled outward, they are respectively taken out from the diagonal of the button area, which can increase the sensitivity of the sensing area; 2) the position of the touch sensing area can be accurately determined by the set identification line to avoid the change of the sensing capacitance due to the sensing area capacitance measuring system. Sensitive to cause false touches, greatly improving the accuracy of the sensing; 3) processing the signal line and the sensing state of its identification line through the logic circuit, thereby filtering the wrong sensing state. Thus, the present invention can be used to increase the contact density as much as possible, and the present invention has made a breakthrough.

BRIEF DESCRIPTION OF THE DRAWINGS:

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing the overall structure of an embodiment of the present invention.

2 is a schematic view of the ground wire and the signal wire of the embodiment of FIG. 1 wound outward from the center.

3 is a block diagram of a capacitance measuring circuit and a logic control circuit of the embodiment of FIG. 1.

4 is a schematic diagram of a logic control circuit of the embodiment of FIG. 1.

detailed description:

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the specific embodiments will be described in detail with reference to the accompanying drawings: Fig. 1 to Fig. 4 show an embodiment of the present invention. In the figure, a capacitive touch sensing device controlled by a logic circuit comprises a cover plate 1 having a plurality of button regions, and a capacitive sensing layer 2 and a circuit layer 3 are sequentially laminated under the button region, wherein the capacitive sensing layer 2 is The upper conductive ink layer 21, the intermediate insulating layer 22, and the lower conductive ink layer 23, the circuit layer 3 includes a power source, a ground line, a central processor, and a touch button circuit; the touch button circuit includes Capacitance measuring circuit 4, logic control circuit 5. The two ends of the capacitor of the capacitive sensing layer respectively lead to a ground line and a signal line. The ground line 8 and the signal line 7 are coiled outward at a certain interval from the center in the button area, until the button area is filled, and then the button area is respectively The diagonal is drawn, as shown in Figure 2. Such an arrangement increases the length of the sensing area capacitor and increases the capacitive sensitivity of the sensing area.

The circuit layer is provided with a corresponding signal line and an identification line of an equivalent capacitance arranged in parallel with the signal line in the corresponding non-key area, and the ground line and the signal line drawn by the capacitance of the capacitance sensing layer and the ground line of the circuit layer respectively Corresponding signal lines are connected. Since the set identification line and the signal line have the same capacitance value, they are arranged side by side in the non-key area and the signal line. When the signal line is affected by parasitic capacitance, stray capacitance and sidelobe capacitance, it will also be reflected on the identification line. Come out, this makes it possible to eliminate these effects, and also eliminates the possibility of corresponding misunderstandings.

The signal line Button corresponding to the circuit layer and the parallel identification line Identify are connected to the input pin of the chip TCH of the capacitance measuring circuit 4, and the signal output pin of the chip TCH of the capacitance measuring circuit 4, The identification line output pin is connected to the signal input pin and the identification line input pin of the logic module chip of the logic control circuit 5, and the signal output pin of the logic module chip of the logic control circuit 5 is connected to the central processor of the circuit layer. As shown in Figure 3. The invention is applicable not only to single contacts but also to multiple contacts. Now take 6 button areas as an example to illustrate, the capacitance measurement circuit uses two TCH601 chips in the design. The signal line connected to the first button area is Button1, and the identification line of the parallel button is Identify1. The input connection pins corresponding to the TCH601 chip are divided into KEY0 and KEY1. The output connection pins corresponding to the TCH601 chip are divided into OUT0 and OUT1, and the logic module. The input pins corresponding to the chip are SI0 and ID0, and the output pin corresponding to the logic module chip is OUT0. The signal output from the output pin OUT0 is connected to the central processor or directly output to the execution device. A detection measurement reference capacitor is connected between the input pins CAPIN and CAPOUT of the TCH601 chip, and the capacitance value is adjusted according to the sensitivity required by the actual circuit, which is 400 to 4000 times of the corresponding sensing layer capacitance, and the capacitance is usually taken. The larger the value, the lower the sensitivity, and the smaller the sensitivity, the higher the sensitivity. One TCH601 chip can accept the signals given by the three keypads, and one logic module chip can accept the signals given by the six keypads. The TCH chip has a variety of model specifications, and the corresponding specifications can be selected according to the number of button areas.

Figure 4 is a schematic diagram of the logic control circuit, still illustrated by six button zones. The chip of the logic control circuit includes a non-AND gate 10 and a NOT gate 9 logic gate circuit. The signal of the signal sensing line outputted by the capacitance measuring circuit directly enters the non-AND gate, and the signal corresponding to the identification line output by the capacitance measuring circuit enters the NOT gate and then enters the non-AND gate, and the non-AND gate outputs the signal to the central processor. Or execute the device.

The invention works like this: when the touch button circuit works, if the touch button area 1 is touched, the weak current outputted by the signal line Button1 is transmitted to the pin KEY0 of the chip TCH601 chip of the capacitance measuring circuit, and the output of the TCH601 chip when it detects a current. The foot OUT0 will output a low level. At this time, if the corresponding identification line is not interfered by the outside world, the TCH601 chip does not detect the output pin when there is current. OUT1 will output a high level, corresponding to the low level of OUT0 output and the high level of OUT1 output. The logic control circuit outputs high level, which is a valid digital signal. At this time, the corresponding identification line is interfered by the outside world. When the TCH601 chip detects a current, its output pin OUT1 will output a low level, corresponding to the low level of OUT0 output and the low level of OUT1 output, the logic control circuit output is low. Level, filter out the error signal.

The embodiments of the present invention are described above with reference to the accompanying drawings, and the embodiments of the present invention are not to be construed as limiting the scope of the invention. Within the scope of protection.

Claims

A capacitive touch sensing device controlled by a logic circuit, comprising a cover plate having a plurality of button regions, wherein a capacitive sensing layer and a circuit layer are sequentially laminated under the button region, wherein the capacitive sensing layer is composed of an upper conductive ink layer and an intermediate insulating layer a layer and a lower conductive ink layer, wherein the circuit layer comprises a power source, a ground line, and a central processor, wherein the circuit layer further comprises a touch button circuit; the touch button circuit comprises a capacitance measuring circuit and a logic control circuit; The capacitance measuring circuit includes a chip TCH, and the logic control circuit includes a logic module chip. The two ends of the capacitor of the capacitive sensing layer respectively lead to a ground line and a signal line, and the ground line and the signal line are separated by a center in the button area. The pitch is outwardly coiled until after being filled with the button area, and is respectively taken out from the diagonal of the button area, and the circuit layer is provided with a corresponding signal line and an identification line of the same capacitance arranged in parallel with the signal line in the corresponding non-key area. The ground and signal lines drawn by the capacitance of the capacitive sensing layer are respectively connected to the ground line of the circuit layer, the corresponding signal line, the signal line corresponding to the circuit layer, and the parallel The identification line is connected with the input pin of the chip TCH of the capacitance measuring circuit, the signal output pin of the chip TCH of the capacitance measuring circuit, the signal output pin of the identification line output pin and the logic module of the logic control circuit, and the identification line input The pins are connected, and the signal output pins of the logic module chip of the logic control circuit are connected to the central processor of the circuit layer.
The capacitive touch sensing device controlled by the logic circuit of claim 1 , wherein the chip of the capacitance measuring circuit is TCH601.
The capacitive touch sensing device controlled by the logic circuit according to claim 2, wherein the chip is connected with a measurement reference capacitor C for detecting a pin C AP IN and a pin C AP OUT of the TCH601. The capacitance of the measurement reference capacitor C is 400 to 4000 times that of the corresponding capacitive sensing layer capacitor.
The capacitive touch sensing device controlled by the logic circuit of claim 1 , wherein the logic module chip of the logic control circuit comprises a non-AND gate and a NOT gate logic gate circuit.