CN101968701B - Touch input device - Google Patents

Abstract

The invention discloses a touch input device which comprises a touch panel, a selection module and a detection module. The touch panel comprises a plurality of capacitance nodes formed and distributed on the touch panel. The selection module is electrically connected with the plurality of capacitance nodes of the touch panel, and the selection module is used for respectively selecting at least one capacitance node from the plurality of capacitance nodes so as to form a first capacitance node set and a second capacitance node set adjacent to the first capacitance node set. The detection module is electrically connected with the selection module. The detection module comprises a signal generator for generating a detection pulse signal and an inverse pulse signal opposite to the detection pulse signal in phase. The detection pulse signal is input to the first capacitance node set through the selection module, and the reverse phase pulse signal is input to the second capacitance node set through the selection module.

Description

touch input device

technical field

The present invention relates to a touch input device and a touch sensing circuit, and in particular to a touch input device and a touch sensing circuit capable of suppressing electromagnetic interference.

Background technique

Due to the advancement of science and technology, products such as information, communication, and electronics are becoming more and more diversified and humanized. For example, through products such as touch panels and handwriting pads, users can directly operate programs or input information on the panels with their fingers or stylus, saving the trouble of using input devices such as mouse or keyboard in the past.

Existing touch panel technologies can be roughly classified into resistive, capacitive, optical and ultrasonic types. The main composition of the resistive touch panel includes upper and lower layers of indium tin oxide conductive glass (ITO glass). When an object touches the upper conductive glass to make it sag and contacts the lower conductive glass, the controller of the panel will detect a voltage signal, and judge the coordinate position of the contact point accordingly.

Capacitive touch panels are further divided into surface capacitive touch panels and projected capacitive touch panels. The structural composition of the surface capacitive touch panel includes a piece of conductive glass, which is coated with conductive material on both sides, and the outside of the conductive glass is covered with a layer of anti-scratch coating. Electrodes around the glass plate create a uniform electric field across the glass surface. Whenever a user touches the panel with a finger, the finger will be capacitively coupled with the outer conductive layer, absorbing a tiny current on the panel. The amount of current flowing from the electrodes located at each corner of the touch panel is proportional to the distance from the finger to the corner, and the controller of the touch panel obtains the position information of the contact point by calculating the current ratio.

Recently, projected capacitive touch panels are widely used in various touch electronic devices (such as smart phones). The positioning principle of the projected capacitive touch panel is to use the capacitance change of the sensing grid embedded in the touch panel to determine the position of the touch point. Please refer to FIG. 1A , which shows a schematic diagram of a touch panel 10 in the prior art. As shown in FIG. 1A , the touch panel 10 is embedded with a plurality of X-direction wires (including X1 ˜ Xm ) and a plurality of Y-direction wires (including Y1 ˜ Yn ) in layers. The wires in the X direction and the wires in the Y direction are staggered to form an induction grid, and a capacitor node (such as the capacitor nodes 100a, 100b, and 100c in FIG. 1A ) is formed at the intersection of each X-direction wire and the Y-direction wire. In the example, there are m*n capacitor nodes in total. When a finger touches the screen, the coupling relationship between the finger and the sensing grid will change the capacitance value of the adjacent capacitance nodes on the sensing grid. The detection circuit can use the capacitance variation of the capacitance node on the sensing grid to calculate the coordinate position of the contact point.

Please also refer to FIG. 1B . FIG. 1B shows a schematic diagram of a touch input device 1 in the prior art. As shown in FIG. 1B , the touch input device 1 in the prior art includes a touch sensing circuit used in conjunction with the touch panel 10 . The touch sensing circuit may include a multitasking selector 12 , a control circuit 120 , and a detection module 14 . In an actual circuit, the detection module 14 may be a capacitance measurement circuit.

In practical applications, the control circuit 120 can control the multitasking selector 12, and select specific X-direction wires (X1~Xm) and Y-direction wires (Y1~Yn) through the multitasking selector 12 to select a specific capacitor node For example, the multitasking selector 12 can select the X-direction wire X3 and the Y-direction wire Y3 to correspond to the capacitor node 100a. The detection module 14 can generate a detection pulse signal Sdet, and input the detection pulse signal Sdet to the capacitor node 100 a through the multiplexer 12 . Subsequently, the detection module 14 can judge the touch detection state of the capacitor node 100a according to the signal feedback of the detection pulse signal Sdet input to the capacitor node 100a.

The control circuit 120 can also control the multitasking selector 12 to select one X or Y direction wire one by one with the multitasking selector 12, and scan the capacitance nodes row by row/column by row (equivalent to detecting a whole row or a whole column at a time). capacitor node). Please refer to FIG. 2 . FIG. 2 shows a timing diagram of the touch input device 1 generating the detection pulse signal Sdet to different capacitance nodes. It can be seen from FIG. 2 that the detection pulse signal Sdet is sequentially input to the X-direction wires X1 , X2 , X3 , X4 . . . .

The detection pulse signal Sdet here is usually a voltage signal or a current signal with a high-frequency periodic pulse. When the detection module 14 inputs these high-frequency detection pulse signals into a specific capacitance node (such as the capacitance node 100a), it will cause electromagnetic interference to other electronic components (such as liquid crystal display screens, etc.) adjacent to the touch panel 10 in the electronic system. , may also cause electromagnetic interference to adjacent capacitor nodes (eg, capacitor nodes 100b, 100c).

Under the requirement of gradually improving the accuracy of the touch panel, designers are eager to reduce the error of touch signal judgment. On the other hand, under the trend of thinner and thinner consumer electronic devices, eliminating or avoiding electromagnetic interference between different electronic components has also become a very important issue.

The present invention proposes a touch input device, which can suppress electromagnetic interference and is widely applicable to various touch input electronic systems, so as to solve the above problems.

Contents of the invention

An object of the present invention is to provide a touch input device, which includes a touch panel, a multiplexer module and a detection module.

According to one embodiment, the touch panel includes a plurality of capacitor nodes formed and distributed on the touch panel. The selection module is electrically connected to the plurality of capacitive nodes of the touch panel, and the selection module selects a first set of capacitive nodes and a second set of capacitive nodes from the plurality of capacitive nodes. Here, the first and second capacitive node sets respectively include at least one capacitive node, and the second capacitive node set is adjacent to the first capacitive node set.

The detection module is electrically connected to the selection module, the detection module includes a signal generator to generate a detection pulse signal, the detection pulse signal is input to the first capacitor node set through the selection module, and the detection module is based on the detection pulse input to the first capacitor node set The signal judges the touch detection state of the first capacitor node set, and the signal generator generates an antiphase pulse signal opposite in phase to the detection pulse signal, and the antiphase pulse signal is input to the second capacitor node set through the selection module.

According to the touch input device of the present invention, the touch panel is a projected capacitive touch panel.

In a specific implementation of the touch input device, wherein the touch panel includes a plurality of X-direction wires and a plurality of Y-direction wires, the plurality of X-direction wires and the plurality of Y-direction wires are arranged in a grid Each of the plurality of capacitor nodes is formed corresponding to one of the X-direction wires and one of the Y-direction wires.

Preferably, the selection module includes:

a first multitasking selector connected between the touch panel and the detection module, the first multitasking selector is electrically connected to the plurality of X-direction wires and the plurality of Y-direction wires of the touch panel, The selection module selects one of the X-direction wires from the plurality of X-direction wires and selects one of the Y-direction wires from the plurality of Y-direction wires through the first multitasking selector, thereby selecting from the plurality of X-direction wires of the touch panel. The capacitance node selects one of the capacitance nodes to form the first set of capacitance nodes; and

The second multitasking selector is connected between the touch panel and the detection module, the second multitasking selector is electrically connected to the plurality of X-direction wires and the plurality of Y-direction wires of the touch panel, The selection module selects one of the X-direction wires from the plurality of X-direction wires and selects one of the Y-direction wires from the plurality of Y-direction wires through the second multitasking selector, thereby selecting from the plurality of X-direction wires of the touch panel. The capacitor node selects one of the capacitor nodes to form the second capacitor node set.

Preferably, the selection module includes:

a first multitasking selector connected between the touch panel and the detection module, the first multitasking selector is electrically connected to the plurality of X-direction wires and the plurality of Y-direction wires of the touch panel, The selection module selects at least one X-direction wire from the plurality of X-direction wires and selects at least one Y-direction wire from the plurality of Y-direction wires through the first multitasking selector, thereby selecting from the plurality of X-direction wires of the touch panel. Selecting at least one capacitor node among the capacitor nodes to form the first capacitor node set; and

The second multitasking selector is connected between the touch panel and the detection module, the second multitasking selector is electrically connected to the plurality of X-direction wires and the plurality of Y-direction wires of the touch panel, The selection module selects at least one X-direction wire from the plurality of X-direction wires and selects at least one Y-direction wire from the plurality of Y-direction wires through the second multitasking selector, thereby selecting from the plurality of X-direction wires of the touch panel. At least one capacitor node is selected from the capacitor nodes to form the second capacitor node set.

Preferably, the selection module includes:

a first multitasking selector connected between the touch panel and the detection module, the first multitasking selector is electrically connected to the plurality of X-direction wires and the plurality of Y-direction wires of the touch panel, The selection module selects a first X-direction wire from the plurality of X-direction wires through the first multitasking selector and grounds or disconnects the plurality of Y-direction wires, thereby selecting all the wires corresponding to the first X-direction wire capacitive nodes and form the first set of capacitive nodes; and

The second multitasking selector is connected between the touch panel and the detection module, the second multitasking selector is electrically connected to the plurality of X-direction wires and the plurality of Y-direction wires of the touch panel, The selection module selects a second X-direction wire from the plurality of X-direction wires through the second multitasking selector and grounds or disconnects the plurality of Y-direction wires, thereby selecting all the wires corresponding to the second X-direction wire capacitor nodes and form the second capacitor node set.

Preferably, the selection module includes:

a first multitasking selector connected between the touch panel and the detection module, the first multitasking selector is electrically connected to the plurality of X-direction wires and the plurality of Y-direction wires of the touch panel, The selection module selects the first Y-direction wire from the plurality of Y-direction wires through the first multi-tasking selector to ground or empty the multiple X-direction wires, thereby selecting all the wires corresponding to the first Y-direction wire capacitive nodes and form the first set of capacitive nodes; and

The second multitasking selector is connected between the touch panel and the detection module, the second multitasking selector is electrically connected to the plurality of X-direction wires and the plurality of Y-direction wires of the touch panel, The selection module selects the second Y-direction wires from the plurality of Y-direction wires through the second multitasking selector to ground or empty the multiple X-direction wires, thereby selecting all the wires corresponding to the second Y-direction wires capacitor nodes and form the second capacitor node set.

In a specific implementation of the touch input device, wherein the detection module judges the touch detection of the first capacitive node set according to the signal feedback of the detection pulse signal input to the first capacitive node set state, wherein the signal feedback corresponds to the capacitance value change of the first capacitor node set.

Another object of the present invention is to provide a touch input device, which includes a touch panel, a selection module, a first detection module, and a second detection module.

According to one embodiment, the touch panel includes a plurality of capacitive nodes formed and distributed on the touch panel. The selection module is electrically connected to the plurality of capacitive nodes of the touch panel, and the selection module selects a first set of capacitive nodes and a second set of capacitive nodes from the plurality of capacitive nodes. Here, the first and second capacitive node sets respectively include at least one capacitive node, and the second capacitive node set is adjacent to the first capacitive node set.

The first detection module is electrically connected to the selection module, the detection module includes a first signal generator to generate a first detection pulse signal, the first detection pulse signal is input to the first capacitor node set through the selection module, and the first detection module is selected according to The first detection pulse signal input to the first capacitor node set determines the first touch detection state of the first capacitor node set. The second detection module is electrically connected to the selection module, and the second detection module includes a second signal generator for generating a second detection pulse signal, wherein the phase of the second detection pulse signal is opposite to that of the first detection pulse signal, and the second detection pulse signal passes through The selection module is input to the second capacitive node set, and the second detection module judges the second touch detection state of the second capacitive node set according to the second detection pulse signal input to the second capacitive node set.

In a specific embodiment of the touch input device, the touch panel is a projected capacitive touch panel.

In a specific implementation of the touch input device, wherein the touch panel includes a plurality of X-direction wires and a plurality of Y-direction wires, the plurality of X-direction wires and the plurality of Y-direction wires are arranged in a grid Each of the plurality of capacitor nodes is formed corresponding to one of the X-direction wires and one of the Y-direction wires.

Preferably, the selection module includes:

a first multitasking selector connected between the touch panel and the detection module, the first multitasking selector is electrically connected to the plurality of X-direction wires and the plurality of Y-direction wires of the touch panel, The selection module selects one of the X-direction wires from the plurality of X-direction wires and selects one of the Y-direction wires from the plurality of Y-direction wires through the first multitasking selector, thereby selecting from the plurality of X-direction wires of the touch panel. The capacitance node selects one of the capacitance nodes to form the first set of capacitance nodes; and

The second multitasking selector is connected between the touch panel and the detection module, the second multitasking selector is electrically connected to the plurality of X-direction wires and the plurality of Y-direction wires of the touch panel, The selection module selects one of the X-direction wires from the plurality of X-direction wires and selects one of the Y-direction wires from the plurality of Y-direction wires through the second multitasking selector, thereby selecting from the plurality of X-direction wires of the touch panel. The capacitor node selects one of the capacitor nodes to form the second capacitor node set.

Preferably, the selection module includes:

a first multitasking selector connected between the touch panel and the detection module, the first multitasking selector is electrically connected to the plurality of X-direction wires and the plurality of Y-direction wires of the touch panel, The selection module selects at least one X-direction wire from the plurality of X-direction wires and selects at least one Y-direction wire from the plurality of Y-direction wires through the first multitasking selector, thereby selecting from the plurality of X-direction wires of the touch panel. Selecting at least one capacitor node among the capacitor nodes to form the first capacitor node set; and

The second multitasking selector is connected between the touch panel and the detection module, the second multitasking selector is electrically connected to the plurality of X-direction wires and the plurality of Y-direction wires of the touch panel, The selection module selects at least one X-direction wire from the plurality of X-direction wires and selects at least one Y-direction wire from the plurality of Y-direction wires through the second multitasking selector, thereby selecting from the plurality of X-direction wires of the touch panel. At least one capacitor node is selected from the capacitor nodes to form the second capacitor node set.

Preferably, the selection module includes:

a first multitasking selector connected between the touch panel and the detection module, the first multitasking selector is electrically connected to the plurality of X-direction wires and the plurality of Y-direction wires of the touch panel, The selection module selects a first X-direction wire from the plurality of X-direction wires through the first multitasking selector and grounds or disconnects the plurality of Y-direction wires, thereby selecting all the wires corresponding to the first X-direction wire capacitive nodes and form the first set of capacitive nodes; and

The second multitasking selector is connected between the touch panel and the detection module, the second multitasking selector is electrically connected to the plurality of X-direction wires and the plurality of Y-direction wires of the touch panel, The selection module selects a second X-direction wire from the plurality of X-direction wires through the second multitasking selector and grounds or disconnects the plurality of Y-direction wires, thereby selecting all the wires corresponding to the second X-direction wire capacitor nodes and form the second capacitor node set.

Preferably, the selection module includes:

a first multitasking selector connected between the touch panel and the detection module, the first multitasking selector is electrically connected to the plurality of X-direction wires and the plurality of Y-direction wires of the touch panel, The selection module selects the first Y-direction wire from the plurality of Y-direction wires through the first multi-tasking selector to ground or empty the multiple X-direction wires, thereby selecting all the wires corresponding to the first Y-direction wire capacitive nodes and form the first set of capacitive nodes; and

The second multitasking selector is connected between the touch panel and the detection module, the second multitasking selector is electrically connected to the plurality of X-direction wires and the plurality of Y-direction wires of the touch panel, The selection module selects the second Y-direction wires from the plurality of Y-direction wires through the second multitasking selector to ground or empty the multiple X-direction wires, thereby selecting all the wires corresponding to the second Y-direction wires capacitor nodes and form the second capacitor node set.

In a specific implementation of the touch input device, wherein the first detection module judges the first capacitance node set according to the signal feedback of the first detection pulse signal input to the first capacitance node set The first touch detection state, wherein the signal feedback corresponds to the capacitance value change of the first capacitance node set.

In a specific implementation of the touch input device, wherein the second detection module judges the second capacitance node set according to the signal feedback of the second detection pulse signal input to the second capacitance node set The second touch detection state, wherein the signal feedback corresponds to the capacitance value change of the second capacitance node set.

The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the accompanying drawings.

Description of drawings

FIG. 1A shows a schematic diagram of a touch panel in the prior art.

FIG. 1B shows a schematic diagram of a touch input device in the prior art.

FIG. 2 shows a timing diagram of a touch input device generating detection pulse signals for different capacitance nodes in the prior art.

Fig. 3 shows a schematic diagram of a touch input device according to a first specific embodiment of the present invention.

FIG. 4A shows a schematic diagram of a selection example of the first capacitor node set and the second capacitor node set.

FIG. 4B shows a schematic diagram of a selection example of the first capacitor node set and the second capacitor node set.

FIG. 4C shows a schematic diagram of a selected example of the first capacitor node set and the second capacitor node set.

FIG. 5 is a schematic diagram showing the timing sequence of the touch input device sequentially generating detection pulse signals and inversion pulse signals to different capacitor node sets in the first specific embodiment.

FIG. 6 shows a schematic diagram of a touch input device according to a second specific embodiment of the present invention.

FIG. 7 shows a timing diagram of the touch input device sequentially generating the first detection pulse signal and the second detection pulse signal to different capacitive node sets in the second specific embodiment.

Detailed ways

See Figure 3. FIG. 3 shows a schematic diagram of a touch input device 3 according to a first specific embodiment of the present invention. The touch input device 3 includes a touch panel 30 , a selection module 32 and a detection module 34 .

In this embodiment, the touch panel 30 includes a plurality of X-direction wires (X1-Xm) and a plurality of Y-direction wires (Y1-Yn), and the X-direction wires and the Y-direction wires are arranged in a grid, as shown in FIG. 3 The wires in the X and Y directions are horizontally and vertically staggered to form a well-shaped grid, but the present invention is not limited thereto, and it is also applicable to wires arranged in other directions or angles. A capacitor node (300 in FIG. 3 ) is formed at the intersection of each X-direction wire and Y-direction wire. That is to say, the touch panel includes a plurality of capacitor nodes, which are respectively formed corresponding to one of the X-direction wires and one of the Y-direction wires and distributed on the touch panel 30 . In practical applications, the touch panel can be a projected capacitive touch panel or other similar capacitive touch panels.

As shown in FIG. 3 , the selection module 32 is electrically connected to the capacitor node of the touch panel 30 . The detection module 34 is electrically connected to the selection module 32 .

In this embodiment, the selection module 32 further includes a first multitasking selector 322 , a second multitasking selector 324 and a control circuit 320 for controlling the above multitasking selectors. The first multitasking selector 322 and the second multitasking selector 324 are respectively connected between the touch panel 30 and the detection module 34 . The first multitasking selector 322 and the second multitasking selector 324 are respectively electrically connected to the X-direction wires (X1˜Xm) and the Y-direction wires (Y1˜Yn) of the touch panel 30 .

The selection module 32 can utilize the control circuit 320 to control the first multiplex selector 322 and the second multiplex selector 324 to select the first capacitor node set and the second capacitor node set from all the capacitor nodes on the touch panel 30 respectively. Here, the first and second capacitive node sets respectively include at least one capacitive node, and in the present invention, the second capacitive node set selected by the second multitasking selector 324 is designed to be adjacent to the first multitasking selector 322. The selected first capacitor node set.

It should be noted that the first set of capacitor nodes and the second set of capacitor nodes here may include at least one capacitor node. In practical applications, the set of capacitor nodes is one capacitor node, multiple adjacent capacitor nodes, or multiple capacitor nodes in an entire row or column.

The selection examples of the three capacitor node sets are mainly listed below as a brief description.

Please refer to FIG. 4A , FIG. 4B and FIG. 4C . FIGS. 4A to 4C respectively show schematic diagrams of three selection examples of the first capacitor node set N1 and the second capacitor node set N2 .

As shown in FIG. 4A, the first capacitor node set N1 selected by the first multiplex selector may include a single capacitor node 300a, and the second capacitor node set N2 selected by the second multiplex selector may include a single capacitor Node 300b. The first multitasking selector selects one of the X-direction wires from the multiple X-direction wires (as X3 in Figure 4A) and selects one of the Y-direction wires (as Y3 in Figure 4A) from the multiple Y-direction wires, Therefore, the capacitor node 300a is selected to form the first capacitor node set N1. On the other hand, the second multitasking selector selects one of the X-direction wires (as X3 in Fig. 4A) from the multiple X-direction wires and selects one of the Y-direction wires (as shown in Fig. 4A ) from the many Y-direction wires. Y2), thereby selecting the capacitor node 300b to form the second capacitor node set N2.

As shown in FIG. 4B, the first capacitor node set N1 selected by the first multitasking selector may include a plurality of capacitor nodes 300a', and the second capacitor node set N2 selected by the second multitasking selector may also include multiple capacitor nodes. A capacitor node 300b'. The first multitasking selector selects at least one X direction wire (such as X1～X3 among Fig. 4B) from these multiple X direction wires and selects at least one Y direction wire (as Y3 among Fig. 4B) from these many Y direction wires ), thereby selecting at least one capacitor node 300a' to form the first capacitor node set N1. The second multitasking selector selects at least one X direction wire (such as X1～X3 among Fig. 4B) from these multiple X direction wires and selects at least one Y direction wire (as Y2 among Fig. 4B) from these many Y direction wires ), thereby selecting at least one capacitor node 300b' to form the second capacitor node set N2.

As shown in FIG. 4C, the first capacitor node set N1 selected by the first multitasking selector may include an entire row or column of capacitor nodes, and the second capacitor node set N2 selected by the second multitasking selector may also include Can contain an entire row or column of capacitor nodes. In the selection example shown in Figure 4C, the first multitasking selector selects one of the X-direction wires X3 and grounds or empty connects the multiple Y-direction wires (Y1～Yn), thereby selecting all the wires corresponding to the X-direction wire X3 The capacitor nodes form a first capacitor node set N1. At the same time, the second multitasking selector is connected between the touch panel and the detection module, and the second multitasking selector is connected to the plurality of X direction wires and the plurality of Y direction wires of the touch panel Electrically connected, the selection module selects a second X-direction wire X2 from the plurality of X-direction wires through the second multi-tasking selector and connects the plurality of Y-direction wires (Y1-Yn) to ground or empty, thereby All capacitor nodes corresponding to the second X-direction wire X2 are selected to form the second capacitor node set N2.

Based on the above selected examples, the method of selecting a capacitor node to form a capacitor node in the present invention at least includes adjacent nodes on one or more wires in the horizontal or vertical direction. That is to say, the selection of the capacitor node set in the present invention can be selected in various ways such as single point, horizontal extension, vertical extension or block type.

The following paragraphs use the selected example of FIG. 4A for further explanation. Please refer to FIG. 3 and FIG. 4A at the same time. As shown in FIG. 3 , the detection module 34 includes a signal generator 340 for generating a detection pulse signal Sdet, and the detection pulse signal Sdet can be input to the first capacitor node set N1 through the first multiplex selector 322 of the selection module 32 (please refer to FIG. Referring to FIG. 4A), the detection module 34 judges the touch detection state of the first capacitive node set N1 according to the detection pulse signal Sdet input to the first capacitive node set N1.

For example, when the user touches the position of the capacitor node 300 a (namely, the first capacitor node set N1 in this example) on the touch panel 30 , the capacitance value of the capacitor node 300 a will change. At this time, corresponding to the capacitance value change, the detection module 34 can obtain the touch detection state of the first capacitance node set N1 according to the signal feedback of the detection pulse signal Sdet input to the first capacitance node set N1 .

It should be noted that in the present invention, when the signal generator 340 of the detection module 34 generates the detection pulse signal Sdet to the first capacitor node set N1, it also generates an antiphase pulse signal opposite to the phase of the detection pulse signal Sdet Sinv, as shown in FIG. 3 , in this embodiment, the inversion pulse signal Sinv can be generated through a simple inversion circuit based on the detection pulse signal Sdet, but the invention is not limited thereto. In another embodiment, two sets of synchronous but inverting signal generators can also be set independently to generate signals separately or by other methods of inverting signals, which are well known to those skilled in the art and will not be described in detail here. The inverted pulse signal Sinv here is input to the second capacitor node set N2 adjacent to the first capacitor node set N1 through the selection module 32 .

Please also refer to FIG. 5 . FIG. 5 shows a timing diagram of the touch input device 3 sequentially generating the detection pulse signal Sdet and the inversion pulse signal Sinv to different capacitor node sets. It can be seen from FIG. 5 that within a specific detection cycle (such as time point t0 to time point t1 in FIG. 5 ), the detection module 34 simultaneously generates a detection pulse signal Sdet and an inverted pulse signal Sinv and inputs them to two adjacent sets of capacitors in the node set. In this way, the detection pulse signal Sdet can be used to sense the touch detection state of the capacitor node, and at the same time, the antiphase pulse signal Sinv that is inverse to it can be used to suppress the electromagnetic radiation interference of the detection pulse signal Sdet on other electronic components, and also has It helps to suppress the electromagnetic conduction interference of the detection pulse signal Sdet to other capacitance nodes.

To sum up, the touch input device 3 can reduce the influence of electromagnetic interference generated by the detection pulse signal Sdet by generating an antiphase pulse signal Sinv that is inverse to the detection pulse signal Sdet, and inputting it to the vicinity of the capacitor node set to be detected. The present invention is not limited thereto.

See Figure 6. FIG. 6 shows a schematic diagram of a touch input device 5 according to a second specific embodiment of the present invention. The biggest difference from the first embodiment is that the touch input device 5 includes two sets of detection modules, such as the first detection module 54 and the second detection module 56 in FIG. 5 .

In this embodiment, the first detection module 54 and the second detection module 56 respectively include respective signal generators ( 540 , 560 ) to generate the first detection pulse signal Sdet+ and the second detection pulse signal Sdet−. The first detection pulse signal Sdet+ can be input to the first capacitor node set through the selection module 52 to determine the touch detection state of the first capacitor node set. The second detection pulse signal Sdet− can be input to a second capacitor node set adjacent to the first capacitor node set through the selection module 52 to determine the touch detection status of the second capacitor node set.

It should be noted that the first detection pulse signal Sdet+ and the second detection pulse signal Sdet- are opposite to each other, that is to say, the first detection pulse signal Sdet+ and the second detection pulse signal Sdet- suppress each other's electromagnetic interference and improve System stability. On the other hand, the first detection module 54 and the second detection module 56 can respectively judge the touch detection states of the two capacitance node sets according to the first detection pulse signal Sdet+ and the second detection pulse signal Sdet-, theoretically, the The judgment speed of touch detection is increased by at least two times. See Figure 7. FIG. 7 shows a timing diagram of the touch input device 5 sequentially generating the first detection pulse signal Sdet+ and the second detection pulse signal Sdet− to different capacitive node sets.

For example, the detection corresponding to FIG. 7 can be that the first detection module 54 inputs the first detection pulse signal Sdet+ from the X-direction wire X3, and all the Y-direction wires (Y1-Yn) are grounded or empty, so as to select the corresponding X3 All the capacitor nodes form the first capacitor node set N1, that is, to detect whether there is a touch on (X3, Y1˜Yn). The second detection module 56 inputs the second detection pulse signal Sdet- from the X-direction wire X4, and connects all the Y-direction wires (Y1-Yn) to ground or empty, so as to select all capacitor nodes corresponding to X4 to form the second capacitor node set N2 , that is, to detect whether there is a touch on (X4, Y1-Yn).

To sum up, in the touch input device 5 of the present invention, the relative positional relationship between the selected first capacitor node group and the capacitor nodes formed by the second capacitor node group is not limited to the vertical or horizontal adjacent relationship. For example, in another embodiment, each capacitor node group may contain adjacent capacitor nodes arranged in horizontal, circular, square, oblique or other geometric figures, and the number of capacitor nodes is not limited. A single capacitor node, or two or more capacitor nodes, can achieve similar or faster detection and judgment effects. The actions (running) and principles of other internal components of the touch input device 5 in the second embodiment are substantially the same as those in the first embodiment, and will not be repeated here.

Compared with the prior art, the present invention inputs a group of synchronous but reversed pulse signals into adjacent capacitor nodes or adjacent capacitor node groups to detect and judge the touch state, and utilizes the reverse relationship between the pulse signals Reducing electromagnetic interference to other components in the system can improve the stability of the touch input device.

Through the detailed description of the above preferred specific embodiments, it is hoped that the characteristics and spirit of the present invention can be described more clearly, rather than the scope of the present invention is limited by the preferred specific embodiments disclosed above. On the contrary, the intention is to cover various modifications and equivalent arrangements within the scope of claims of the present invention.

Explanation of main component symbols

1, 3, 5: Touch input device 10, 30, 50: Touch panel

12, 32, 52: touch sensing circuit

100a, 100b, 100c, 300a, 300b, 300c: capacitor nodes

300, 500: capacitor nodes t0, t1: time points

12: Multi-task selector 14, 34: Detection module

54: The first detection module 56: The second detection module

320, 520: Selection module 340, 540, 560: Signal generator

322, 522: the first multitasking selector

324, 524: Second multitasking selector

120, 320, 520: control circuit

X1, X2, X3, X4, Xm: wires in X direction

Y1, Y2, Y3, Y4, Yn: wires in the Y direction

Sdet: Detection pulse signal Sinv: Inversion pulse signal

Sdet+: the first detection pulse signal Sdet-: the second detection pulse signal.

Claims (17)

1. A touch input device, comprising: touch panel, which includes: A plurality of capacitor nodes are formed and distributed on the touch panel; A selection module, electrically connected to the plurality of capacitive nodes of the touch panel, the selection module selects a first set of capacitive nodes and adjacent to the first set of capacitive nodes from the plurality of capacitive nodes a second set of capacitive nodes; and The detection module is electrically connected to the selection module, the detection module includes a signal generator to generate a detection pulse signal, and the detection pulse signal is input to the first capacitor node set through the selection module, the The detection module judges the touch detection status of the first capacitor node set according to the detection pulse signal input to the first capacitor node set, and the signal generator also generates a phase opposite to the detection pulse signal The inverted pulse signal is input to the second capacitor node set through the selection module. 2. The touch input device according to claim 1, wherein the touch panel is a projected capacitive touch panel. 3. The touch input device according to claim 1, wherein the touch panel comprises a plurality of X-direction wires and a plurality of Y-direction wires, and the plurality of X-direction wires and the plurality of Y-direction wires are arranged with each other In a grid shape, each of the plurality of capacitor nodes is formed corresponding to one of the X-direction wires and one of the Y-direction wires. 4. The touch input device according to claim 3, wherein the selection module comprises: The first multitasking selector is connected between the touch panel and the detection module, and the first multitasking selector is connected to the plurality of X direction wires and the plurality of Y direction wires of the touch panel. The direction wires are electrically connected, and the selection module selects one of the X-direction wires from the plurality of X-direction wires and selects one of the Y-direction wires from the plurality of Y-direction wires through the first multi-tasking selector, by selecting one capacitance node from the plurality of capacitance nodes of the touch panel to form the first set of capacitance nodes; and The second multitasking selector is connected between the touch panel and the detection module, and the second multitasking selector is connected to the plurality of X direction wires and the plurality of Y direction wires of the touch panel. The direction wires are electrically connected, and the selection module selects one of the X-direction wires from the plurality of X-direction wires and selects one of the Y-direction wires from the plurality of Y-direction wires through the second multitasking selector, by One of the capacitor nodes is selected from the plurality of capacitor nodes of the touch panel to form the second capacitor node set. 5. The touch input device according to claim 3, wherein the selection module comprises: The first multitasking selector is connected between the touch panel and the detection module, and the first multitasking selector is connected to the plurality of X direction wires and the plurality of Y direction wires of the touch panel. Direction wires are electrically connected, and the selection module selects at least one X-direction wire from the plurality of X-direction wires and selects at least one Y-direction wire from the plurality of Y-direction wires through the first multitasking selector, by selecting at least one capacitance node from the plurality of capacitance nodes of the touch panel to form the first set of capacitance nodes; and The second multitasking selector is connected between the touch panel and the detection module, and the second multitasking selector is connected to the plurality of X direction wires and the plurality of Y direction wires of the touch panel. The direction wires are electrically connected, and the selection module selects at least one X-direction wire from the plurality of X-direction wires and selects at least one Y-direction wire from the plurality of Y-direction wires through the second multitasking selector, by At least one capacitor node is selected from the plurality of capacitor nodes of the touch panel to form the second capacitor node set. 6. The touch input device according to claim 3, wherein the selection module comprises: The first multitasking selector is connected between the touch panel and the detection module, and the first multitasking selector is connected to the plurality of X direction wires and the plurality of Y direction wires of the touch panel. The direction wires are electrically connected, and the selection module selects the first X direction wire from the plurality of X direction wires through the first multitasking selector and grounds or connects the plurality of Y direction wires, thereby using selecting all capacitance nodes corresponding to the first X-direction wire and forming the first capacitance node set; and The second multitasking selector is connected between the touch panel and the detection module, and the second multitasking selector is connected to the plurality of X direction wires and the plurality of Y direction wires of the touch panel. The direction wires are electrically connected, and the selection module selects a second X direction wire from the plurality of X direction wires through the second multitasking selector and grounds or connects the plurality of Y direction wires, thereby using Selecting all capacitor nodes corresponding to the second X-direction wires to form the second capacitor node set. 7. The touch input device according to claim 3, wherein the selection module comprises: The first multitasking selector is connected between the touch panel and the detection module, and the first multitasking selector is connected to the plurality of X direction wires and the plurality of Y direction wires of the touch panel. The direction wires are electrically connected, and the selection module connects the plurality of X direction wires to ground or empty connection through the first multitasking selector and selects the first Y direction wire from the plurality of Y direction wires, thereby using selecting all capacitance nodes corresponding to the first Y-direction wires and forming the first set of capacitance nodes; and The second multitasking selector is connected between the touch panel and the detection module, and the second multitasking selector is connected to the plurality of X direction wires and the plurality of Y direction wires of the touch panel. The direction wires are electrically connected, and the selection module connects the plurality of X direction wires to ground or empty connection through the second multitasking selector and selects a second Y direction wire from the plurality of Y direction wires, thereby using Selecting all capacitor nodes corresponding to the second Y-direction wires to form the second capacitor node set. 8. The touch input device according to claim 1, wherein the detection module further judges the value of the first capacitive node set according to the signal feedback of the detection pulse signal input to the first capacitive node set The touch detection state, wherein the signal feedback corresponds to the capacitance value change of the first capacitance node set. 9. A touch input device, comprising: touch panel, which includes: A plurality of capacitor nodes are formed and distributed on the touch panel; A selection module, electrically connected to the plurality of capacitive nodes of the touch panel, the selection module selects a first set of capacitive nodes and adjacent to the first set of capacitive nodes from the plurality of capacitive nodes a second set of capacitive nodes; and The first detection module is electrically connected to the selection module, the first detection module includes a first signal generator to generate a first detection pulse signal, and the first detection pulse signal is input to the selection module through the selection module The first capacitive node set, the first detection module judges the first touch detection state of the first capacitive node set according to the first detection pulse signal input to the first capacitive node set; and The second detection module is electrically connected to the selection module, and the second detection module includes a second signal generator for generating a second detection pulse signal, wherein the second detection pulse signal is the same as the first detection pulse signal The phase is opposite, the second detection pulse signal is input to the second capacitor node set through the selection module, and the second detection module is input to the second capacitor node set according to the second detection pulse signal The signal determines the second touch detection state of the second capacitor node set. 10. The touch input device according to claim 9, wherein the touch panel is a projected capacitive touch panel. 11. The touch input device according to claim 9, wherein the touch panel comprises a plurality of X-direction wires and a plurality of Y-direction wires, and the plurality of X-direction wires and the plurality of Y-direction wires are arranged with each other In a grid shape, each of the plurality of capacitor nodes is formed corresponding to one of the X-direction wires and one of the Y-direction wires. 12. The touch input device according to claim 11, wherein the selection module comprises: The first multitasking selector is connected between the touch panel and the detection module, and the first multitasking selector is connected to the plurality of X direction wires and the plurality of Y direction wires of the touch panel. The direction wires are electrically connected, and the selection module selects one of the X-direction wires from the plurality of X-direction wires and selects one of the Y-direction wires from the plurality of Y-direction wires through the first multi-tasking selector, by selecting one capacitance node from the plurality of capacitance nodes of the touch panel to form the first set of capacitance nodes; and The second multitasking selector is connected between the touch panel and the detection module, and the second multitasking selector is connected to the plurality of X direction wires and the plurality of Y direction wires of the touch panel. The direction wires are electrically connected, and the selection module selects one of the X-direction wires from the plurality of X-direction wires and selects one of the Y-direction wires from the plurality of Y-direction wires through the second multitasking selector, by One of the capacitor nodes is selected from the plurality of capacitor nodes of the touch panel to form the second capacitor node set. 13. The touch input device according to claim 11, wherein the selection module comprises: The first multitasking selector is connected between the touch panel and the detection module, and the first multitasking selector is connected to the plurality of X direction wires and the plurality of Y direction wires of the touch panel. Direction wires are electrically connected, and the selection module selects at least one X-direction wire from the plurality of X-direction wires and selects at least one Y-direction wire from the plurality of Y-direction wires through the first multitasking selector, by selecting at least one capacitance node from the plurality of capacitance nodes of the touch panel to form the first set of capacitance nodes; and The second multitasking selector is connected between the touch panel and the detection module, and the second multitasking selector is connected to the plurality of X direction wires and the plurality of Y direction wires of the touch panel. The direction wires are electrically connected, and the selection module selects at least one X-direction wire from the plurality of X-direction wires and selects at least one Y-direction wire from the plurality of Y-direction wires through the second multitasking selector, by At least one capacitor node is selected from the plurality of capacitor nodes of the touch panel to form the second capacitor node set. 14. The touch input device according to claim 11, wherein the selection module comprises: The first multitasking selector is connected between the touch panel and the detection module, and the first multitasking selector is connected to the plurality of X direction wires and the plurality of Y direction wires of the touch panel. The direction wires are electrically connected, and the selection module selects the first X direction wire from the plurality of X direction wires through the first multitasking selector and grounds or connects the plurality of Y direction wires, thereby using selecting all capacitance nodes corresponding to the first X-direction wire and forming the first capacitance node set; and The second multitasking selector is connected between the touch panel and the detection module, and the second multitasking selector is connected to the plurality of X direction wires and the plurality of Y direction wires of the touch panel. The direction wires are electrically connected, and the selection module selects a second X direction wire from the plurality of X direction wires through the second multitasking selector and grounds or connects the plurality of Y direction wires, thereby using Selecting all capacitor nodes corresponding to the second X-direction wires to form the second capacitor node set. 15. The touch input device according to claim 11, wherein the selection module comprises: The first multitasking selector is connected between the touch panel and the detection module, and the first multitasking selector is connected to the plurality of X direction wires and the plurality of Y direction wires of the touch panel. The direction wires are electrically connected, and the selection module connects the plurality of X direction wires to ground or empty connection through the first multitasking selector and selects the first Y direction wire from the plurality of Y direction wires, thereby using selecting all capacitance nodes corresponding to the first Y-direction wires and forming the first set of capacitance nodes; and The second multitasking selector is connected between the touch panel and the detection module, and the second multitasking selector is connected to the plurality of X direction wires and the plurality of Y direction wires of the touch panel. The direction wires are electrically connected, and the selection module connects the plurality of X direction wires to ground or empty connection through the second multitasking selector and selects a second Y direction wire from the plurality of Y direction wires, thereby using Selecting all capacitor nodes corresponding to the second Y-direction wires to form the second capacitor node set. 16. The touch input device according to claim 9, wherein the first detection module judges that the first The first touch detection state of the capacitor node set, wherein the signal feedback corresponds to the capacitance value change of the first capacitor node set. 17. The touch input device according to claim 9, wherein the second detection module judges that the second The second touch detection state of the capacitor node set, wherein the signal feedback corresponds to the capacitance value change of the second capacitor node set.

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