CN-121996105-A - Touch sensing architecture

Abstract

The invention provides a touch sensing architecture, which comprises a first receiving circuit and a second receiving circuit, wherein the first receiving circuit receives a first touch signal and amplifies the first touch signal according to a first multiplying power. In the first detection mode, the second receiving circuit receives the second touch signal and amplifies the second touch signal according to the second multiplying power, and in the second detection mode, the second receiving circuit is coupled to the first receiving circuit, and the touch sensing structure amplifies the first touch signal according to the first multiplying power and the second multiplying power.

Inventors

• LIU ZIXUAN
• DAI HONGYAN

Assignees

• 矽创电子股份有限公司

Dates

Publication Date

20260508

Application Date

20251106

Priority Date

20241106

Claims (10)

1. 1. A touch-sensing structure is provided, characterized in that it comprises: A first receiving circuit for receiving a first touch signal, the first receiving circuit amplifying the first touch signal according to a first magnification, and The second receiving circuit is coupled with the first receiving circuit in a first detection mode, receives a second touch signal, amplifies the second touch signal according to a second multiplying power, and amplifies the first touch signal according to the first multiplying power and the second multiplying power in a second detection mode.
2. 2. The touch sensing architecture of claim 1, wherein the first receiving circuit comprises: The operational amplifier amplifies the first touch signal according to the first multiplying power; A filter coupled to the operational amplifier, the filter being turned off in the second detection mode, and An analog-to-digital converter coupled to the filter, the analog-to-digital converter being turned off in the second detection mode.
3. 3. The touch sensing architecture of claim 2, wherein the first receiving circuit comprises: A first impedance coupled to the operational amplifier, and And a second impedance coupled to the first impedance and the operational amplifier, wherein the ratio of the impedance values between the first impedance and the second impedance determines the first multiplying power.
4. 4. The touch sensing architecture of claim 2, wherein the first receiving circuit comprises: the first switching unit is coupled with the operational amplifier, and the first receiving circuit receives the first touch signal through the first switching unit; a second switching unit coupled to the operational amplifier, the operational amplifier receiving a reference voltage via the second switching unit, and And the third switching unit is coupled with the operational amplifier and the filter, and the filter is coupled with the operational amplifier through the third switching unit.
5. 5. The touch sensing architecture of claim 2, wherein the first receiving circuit comprises: And a fourth switching unit coupled to the operational amplifier and the second receiving circuit, wherein in the second detection mode, the second receiving circuit is coupled to the first receiving circuit through the fourth switching unit.
6. 6. The touch sensing architecture of claim 1, wherein the second receiving circuit has a same circuit structure as the first receiving circuit.
7. 7. The touch sensing architecture of claim 1, further comprising: The third receiving circuit is coupled to the second receiving circuit in a third detection mode, and the touch sensing structure amplifies the first touch signal according to the first multiplying power, the second multiplying power and a third multiplying power.
8. 8. The touch sensing architecture of claim 7, wherein the third receiving circuit has the same circuit structure as the first receiving circuit.
9. 9. The touch sensing architecture of claim 1, wherein in a differential mode, the first receiving circuit receives the first touch signal and a first reverse touch signal, the waveform of the first reverse touch signal being opposite to the waveform of the first touch signal.
10. 10. The touch sensing architecture of claim 1, wherein the touch sensing architecture performs the first detection mode before the second detection mode.

Description

Touch sensing architecture Technical Field The present invention relates to a touch sensing architecture, and more particularly to a touch sensing architecture for a touch sensing device. Background With the progress of technology, touch sensing devices are widely used in various technical products, such as smart phones and tablet computers. Besides the common capacitive finger touch function, the application of the touch pen is more and more popular, and various experiences are provided for users. Because the touch sensing signal has very small amplitude or high resolution, the touch sensing device needs a larger magnification. The circuit cannot increase the amplification factor by continuously increasing the device, because the bandwidth of the internal device is not infinite, the amplification factor of the touch sensing device is limited by the bandwidth of the internal device to reach a limit. If the requirement of the maximum magnification is met, more stages of circuits are required, so that the circuit space requirement is high, and the circuit cost is greatly increased. Based on the foregoing, the present invention provides a touch sensing architecture, which solves the above-mentioned various technical problems. Disclosure of Invention An objective of the present invention is to provide a touch sensing architecture, which includes a first receiving circuit and a second receiving circuit, wherein the first receiving circuit receives a first touch signal and amplifies the first touch signal according to a first magnification. In the first detection mode, the second receiving circuit receives the second touch signal and amplifies the second touch signal according to the second multiplying power, and in the second detection mode, the second receiving circuit is coupled to the first receiving circuit, and the touch sensing structure amplifies the first touch signal according to the first multiplying power and the second multiplying power. An objective of the present invention is to provide a touch sensing architecture, which further includes a third receiving circuit, in a first detection mode, the first receiving circuit receives a first touch signal and amplifies the first touch signal according to a first magnification, the second receiving circuit receives a second touch signal and amplifies the second touch signal according to a second magnification, the third receiving circuit receives the third touch signal and amplifies the first touch signal according to a third magnification, in a second detection mode, the second receiving circuit is coupled to the first receiving circuit, the touch sensing architecture amplifies the first touch signal according to the first magnification and the second magnification, the third receiving circuit is coupled to a next receiving circuit, and the touch sensing architecture amplifies the third touch signal according to the third magnification and another magnification. An objective of the present invention is to provide a touch sensing architecture, which further includes a third receiving circuit, wherein in a third detection mode, the first receiving circuit is coupled to the second receiving circuit, the second receiving circuit is coupled to the third receiving circuit, and the touch sensing architecture amplifies the first touch signal according to the first magnification, the second magnification and the third magnification. An objective of the present invention is to provide a touch sensing architecture, which includes the touch sensing architecture provided by the present invention, which can realize detection modes with different fine degrees, can achieve a good balance between efficiency and resolution, and can provide appropriate technical support under different application requirements, thereby realizing a more comprehensive sensing system. Drawings FIG. 1 is a schematic diagram of a touch sensing architecture according to a first embodiment of the present invention; FIG. 2 is a schematic diagram of a touch sensing architecture according to a first embodiment of the present invention in a first detection mode; FIG. 3 is a schematic diagram of a touch sensing architecture according to a first embodiment of the present invention in a second detection mode; FIG. 4 is a schematic diagram of a touch sensing architecture according to a second embodiment of the present invention; FIG. 5 is a schematic diagram of a touch sensing architecture according to a second embodiment of the present invention in a first detection mode; FIG. 6 is a schematic diagram of a touch sensing architecture according to a second embodiment of the present invention in a second detection mode; FIG. 7 is a schematic diagram illustrating a touch sensing architecture according to a second embodiment of the invention in a third detection mode. [ Figure number control description ] 1 Touch sensing architecture 2 Touch sensing device 100 First receiving circuit 200 Second receiving circ