TWI880580B - Touch sensing device and signal processing method threeof - Google Patents

Abstract

A touch sensing device and a signal processing method thereof are provided. The touch sensing device includes an encoder, an analog front-end circuit, a decoder, and a plurality of capacitive touch units. The capacitive touch units generate a plurality of touch signals correspondingly by a self-capacitive sensing mode. The encoder encodes the touch signals in each of multiple time intervals to generate a corresponding encoded data. The analog front-end circuit and converts multiple encoded data generated in multiple time intervals into corresponding digital data. The decoder decodes the digital data according to a decoding matrix to generate a decoding array. Each of a plurality of sub-arrays in the decoding array corresponds to each of the touch signals in equal proportions.

Description

Touch sensing device and signal processing method thereof

The present invention relates to a touch sensing technology, and in particular to a touch sensing device and a signal processing method thereof.

As the application of touch devices becomes more and more widespread, the related technologies of touch sensing are becoming more and more important. The touch capacitor of the touch device will correspond to the analog front end (AFE) circuit to transmit and adjust the touch signal. Due to the large number of touch capacitors, the number of AFE circuits is also large, which requires a large amount of drive current to drive these AFE circuits. In addition, the touch signal of the touch capacitor will occasionally disconnect the signal due to the time-sharing transmission, resulting in a decrease in SNR. It cannot be continuously transmitted to the AFE, so the signal-to-noise ratio (SNR) of the touch sensing device cannot be improved.

The present invention provides a touch sensing device and a signal processing method thereof, which can effectively reduce the driving current of the touch sensing device and maintain or even improve the SNR.

The touch sensing device of the present invention includes an encoder, an analog front-end circuit, a decoder, and a plurality of capacitive touch units. The plurality of capacitive touch units generate a plurality of touch signals in a self-capacitive sensing mode. The encoder is coupled to the plurality of capacitive touch units, and encodes the plurality of touch signals in each of a plurality of time intervals to generate corresponding encoded data. The analog front-end circuit is coupled to the encoder, and converts the plurality of encoded data generated in the plurality of time intervals into corresponding digital data. The decoder is coupled to the analog front-end circuit, and decodes the digital data according to a decoding matrix to generate a decoding array. The plurality of sub-arrays of the decoding array correspond to the plurality of touch signals in equal proportions.

The signal processing method of the present invention includes: providing multiple capacitive touch units to generate multiple touch signals in a self-capacitive sensing mode; encoding the multiple touch signals in each of multiple time intervals to generate corresponding coded data; converting each coded data into corresponding digital data; and decoding the multiple digital data generated in multiple time intervals according to a decoding matrix to generate a decoding array. The multiple sub-arrays of the decoding array correspond to the multiple touch signals in equal proportions.

Based on the above, the touch sensing device of the embodiment of the present invention uses an encoder to encode the touch signals of multiple touch units in multiple time intervals, thereby reducing the required number of analog front-end circuits and further reducing the driving current used to drive the analog front-end circuits. In addition, the embodiment of the present invention can also effectively maintain or improve the SNR of the touch sensing device.

100, 400, 500, 501: Touch sensor device

CTU_1~CTU_n: Capacitive touch unit

110, 410, 510, 511: encoder

120, 420, 520, 521: Analog front-end circuit

130, 630, 531: Decoder

C1~Cn: touch signal

CD_1~CD_n: encoding data

DD_1~DD_n: digital data

T1~T7: Time period

DMAX_1, DMAX_2, DMAX_3: decoding matrix

MU1: Multiplexer

AC1: Operational circuit

CA1, CA2, CA3, CA4: Capacitors

R1, R2, R3, R4: resistors

VR1, VR2, VR3, VR4: variable resistors

OPA1, OPA2: Operational amplifiers

TCLK: clock

DAT1, DAT2: Calculation data

PNL1, PNL2: Panel

CHP1, CHP2: Chip

S602, S604, S606: Steps

FIG1 shows a circuit diagram of a touch sensing device according to an embodiment of the present invention.

Figure 2 shows a schematic diagram of the operation of a touch sensing device according to an embodiment of the present invention.

FIG3A is a schematic diagram showing the operation of a touch sensing device according to an embodiment of the present invention.

FIG3B shows a circuit diagram of a touch sensing device according to an embodiment of the present invention.

FIG4 is a circuit diagram of an encoder and an analog front-end circuit in a touch sensing device according to an embodiment of the present invention.

FIG5A shows a component configuration diagram of a touch sensing device according to an embodiment of the present invention.

FIG5B shows a component configuration diagram of a touch sensing device of another embodiment of the present invention.

FIG6 shows a flow chart of a signal processing method according to an embodiment of the present invention.

Please refer to FIG. 1, which shows a circuit diagram of a touch sensing device of an embodiment of the present invention. The touch sensing device 100 includes capacitive touch units CTU_1~CTU_n, an encoder 110, an analog front-end circuit 120, and a decoder 130. The encoder 110 can be coupled to the capacitive touch units CTU_1~CTU_n, the analog front-end circuit 120 can be coupled to the encoder 110, and the decoder 130 can be coupled to the analog front-end circuit 120. The capacitive touch units CTU_1~CTU_n of this embodiment can all be self-capacitance touch sensing devices.

Each of the capacitive touch units CTU_1~CTU_n may generate a touch signal C1~Cn correspondingly. In each of the multiple time intervals, the encoder 110 may continuously receive the touch signal C1~Cn and encode the touch signal C1~Cn to generate a coded data. In other words, the encoder 110 may generate coded data CD_1~CD_n in each of the multiple time intervals. The analog front-end circuit 120 may convert the analog signal into a digital signal, that is, the analog front-end circuit 120 may receive the coded data CD_1~CD_n and convert the coded data CD_1~CD_n into digital data DD_1~DD_n. The decoder 130 can receive digital data DD_1~DD_n and decode the digital data DD_1~DD_n according to the decoding matrix to generate a decoding array.

In this embodiment, the touch signals C1~Cn are analog signals, the coded data CD_1~CD_n are also analog signals, and the digital data DD_1~DD_n are digital signals.

The multiple sub-arrays of the decoding array can correspond to the touch signals C1~Cn. If the touch signals C1~Cn are converted from analog signals to digital signals, these digital signals can correspond to the values of the multiple sub-arrays in the decoding array.

In this embodiment, the touch sensing device 100 can encode and decode multiple capacitive touch units with only one analog front-end circuit, so that the driving current used by the touch sensing device 100 to drive the analog front-end circuit can be reduced. In addition, the encoder 110 can continuously receive the touch signals C1~Cn in multiple time intervals, so that the time for the touch sensing device 100 to receive the touch signals C1~Cn increases, thereby improving the SNR of the touch sensing device 100.

Please refer to FIG. 2. FIG. 2 is a schematic diagram of the operation of a touch sensing device of an embodiment of the present invention. In FIG. 2, the touch sensing device of the present embodiment includes capacitive touch units CTU_1~CTU_4, an encoder 210, an analog front-end circuit 220, and a decoder 230. The encoder 210 can be coupled to the capacitive touch units CTU_1~CTU_4, the analog front-end circuit 220 can be coupled to the encoder 210, and the decoder 230 can be coupled to the analog front-end circuit 220. The capacitive touch units CTU_1~CTU_4 of the present embodiment can be arranged in a 2x2 matrix, a straight line, a horizontal line, or other arrangements. The present embodiment does not limit the arrangement of these capacitive touch units.

In this embodiment, the encoder 210 can receive the touch signals C1-C4, and the encoder 210 can generate coded data CD_1-CD_4 in the time interval T1-T4 according to the touch signals C1-C4. The analog front-end circuit 220 can convert the coded data CD_1-CD_4 into digital data DD_1-DD_4 in the time interval T1-T4. The decoder 230 can receive the digital data DD_1-DD_4, and the decoder 230 has a decoding matrix DMAX_1. Figure 2 only has one touch sensing device, but for the convenience of describing the operation of the touch sensing device in the time period T1 to T4, the touch sensing devices corresponding to the time periods T1 to T4 are shown in Figure 2 as schematic diagrams.

In the time interval T1, the encoder 210 may receive the touch signals C1-C4 to generate the coded data CD_1, and the analog front-end circuit 220 may convert the coded data CD_1 into digital data DD_1. In the time interval T2, the encoder 210 may receive the touch signals C1-C4 to generate the coded data CD_2, and the analog front-end circuit 220 may convert the coded data CD_2 into digital data DD_2. In the time interval T3, the encoder 210 may receive the touch signals C1-C4 to generate the coded data CD_3, and the analog front-end circuit 220 may convert the coded data CD_3 into digital data DD_3. In the time interval T4, the encoder 210 can receive the touch signals C1~C4 to generate the coded data CD_4, and the analog front-end circuit 220 converts the coded data CD_4 into digital data DD_4.

In the time interval T1-T4 of the present embodiment, the capacitive touch units CTU_1-CTU_4 can be coupled to the input end of the encoder 210. The output end of the encoder 210 can be coupled to the input end of the analog front-end circuit 220, so that the analog front-end circuit 220 obtains digital data DD_1-DD_4. In the time interval T1, the capacitive touch unit CTU_1 is coupled to the inverting input end of the encoder 210, and the capacitive touch units CTU_2, CTU_3, and CTU_4 are coupled to the non-inverting input end of the encoder 210. In the time interval T2, the capacitive touch unit CTU_2 is coupled to the inverting input terminal of the encoder 210, and the capacitive touch units CTU_1, CTU_3, and CTU_4 are coupled to the non-inverting input terminal of the encoder 210. In the time interval T3, the capacitive touch unit CTU_3 is coupled to the inverting input terminal of the encoder 210, and the capacitive touch units CTU_1, CTU_2, and CTU_4 are coupled to the non-inverting input terminal of the encoder 210. In the time interval T4, the capacitive touch unit CTU_4 is coupled to the inverting input terminal of the encoder 210, and the capacitive touch units CTU_1, CTU_2, and CTU_3 are coupled to the non-inverting input terminal of the encoder 210. The encoded data CD_1~CD_4 are then converted into digital data DD_1~DD_4 through the analog front-end circuit 220, as shown below: DD_1=-C1+C2+C3+C4

DD_2=C1-C2+C3+C4

DD_3=C1+C2-C3+C4

DD_4=C1+C2+C3-C4

After time period T4, decoder 230 receives digital data DD_1~DD_4. Decoder 230 has decoding matrix DMAX_1, and decoder 230 can set decoding matrix DMAX_1 according to coded data DD_1~DD_4. Therefore, decoder 230 can use decoding matrix DMAX_1 to decode digital data DD_1~DD_4 (i.e., digital data DD_1~DD_4 and decoding matrix DMAX_1 perform inner product operation) to generate a decoded array. The content of decoding matrix DMAX_1 and the decoding formula of this embodiment are shown below.

。觸控訊號C1~C4的數位訊號值以等比例明確對應到解碼陣列中運算結果的子陣列[4C1]、[4C2]、[4C3]以及[4C4]，因此可透過此方法得到觸控訊號C1~C4的數值以判斷是否有觸控發生。 From the above formula, it can be seen that after the decoder 230 performs decoding, the calculation result of the decoding array is

The digital signal values of the touch signals C1 to C4 clearly correspond to the sub-arrays [4C1], [4C2], [4C3], and [4C4] of the calculation results in the decoding array in equal proportion. Therefore, the values of the touch signals C1 to C4 can be obtained through this method to determine whether a touch occurs.

In another embodiment, in the time interval T1, the non-inverting input terminal of the encoder can receive the touch signals C1~C4, and the inverting input terminal of the encoder does not receive any signal. In the time interval T2, the non-inverting input terminal of the encoder can receive the touch signals C1 and C3, and the inverting input terminal of the encoder can receive the touch signals C2 and C4. In the time interval T3, the non-inverting input terminal of the encoder can receive the touch signals C1 and C2, and the inverting input terminal of the encoder can receive the touch signals C3 and C4. In the time interval T4, the non-inverting input terminal of the encoder can receive the touch signals C1 and C4, and the inverting input terminal of the encoder can receive the touch signals C2 and C3. In this embodiment, the digital data DD_1~DD_4 generated in the time interval T1~T4 are as follows: DD_1=C1+C2+C3+C4

DD_2=C1-C2+C3-C4

DD_3=C1+C2-C3-C4

DD_4=C1-C2-C3+C4

After the time period T4, the decoder of this embodiment receives the digital data DD_1~DD_4, and the decoder can set the decoding matrix DMAX_2 according to the coded data DD_1~DD_4. The decoder can use the decoding matrix DMAX_2 to decode the digital data DD_1~DD_4 (i.e., the digital data DD_1~DD_4 and the decoding matrix DMAX_2 perform an inner product operation) to generate a decoding array. The content of the decoding matrix DMAX_2 and the decoding formula of this embodiment are shown below.

。若將觸控訊號C1~C4由類比訊號轉換為數位訊號，觸控訊號C1~C4的數位訊號值可明確對應到解碼陣列中的子陣列[4C1]、[4C2]、[4C3]以及[4C4]，因此可透過此方法得到觸控訊號C1~C4的數值以判斷是否有觸控發生。 From the above formula, it can be seen that after the decoder of this embodiment performs decoding, the content of the decoded array is

If the touch signals C1~C4 are converted from analog signals to digital signals, the digital signal values of the touch signals C1~C4 can be clearly corresponded to the sub-arrays [4C1], [4C2], [4C3] and [4C4] in the decoding array. Therefore, the values of the touch signals C1~C4 can be obtained by this method to determine whether a touch occurs.

Please refer to FIG. 3A. FIG. 3A is a schematic diagram of the operation of a touch sensing device according to an embodiment of the present invention. In FIG. 3A, the touch sensing device includes four capacitive touch units. The encoder can receive touch signals C1-C4 via a non-inverting input terminal and an inverting input terminal, and the encoder can generate coded data CD_1-CD_4 in a time interval T1-T4 according to the touch signals C1-C4. The analog front-end circuit can convert the coded data CD_1-CD_4 into digital data DD_1-DD_4 in a time interval T1-T4. The decoder can receive the digital data DD_1-DD_4 and includes a decoding matrix DMAX_2. The circuit details of the touch sensing device in FIG3A can refer to the embodiment in FIG1.

Please refer to Figure 3B. Figure 3B shows an operation schematic diagram of a touch sensing device of an embodiment of the present invention. In Figure 3B, the touch sensing device includes 7 capacitive touch units. The encoder can receive touch signals C1~C7 through a non-inverting input terminal and an inverting input terminal, and the encoder can generate coded data CD_1~CD_7 in a time interval T1~T7 according to the touch signals C1~C7. The analog front-end circuit can convert the coded data CD_1~CD_7 into digital data DD_1~DD_7 in a time interval T1~T7. The decoder can receive digital data DD_1~DD_7 and includes a decoding matrix DMAX_3. The circuit details of the touch sensing device in FIG3B can refer to the embodiment of FIG1.

Here, the time interval T1 and the aforementioned coded data CD_1 and digital data DD_1 are used as examples to illustrate the aforementioned formula and the operation of the encoder. In the time interval T1, the symbols of C1, C2, C3, and C6 in the aforementioned formula for the coded data CD_1 are "+", so the non-inverting input terminal of the encoder receives the touch signals C1, C2, C3, and C6. The symbols of C1, C2, C3, and C6 in the aforementioned formula for the coded data CD_1 are "-", so the inverting input terminal of the encoder receives the touch signals C4, C5, and C7. Similarly, in the time interval T2, the non-inverting input end of the encoder receives the touch signals C1, C2, C5, and C7, and the inverting input end of the encoder receives the touch signals C3, C4, and C6. In this embodiment, the digital data DD_1 to DD_7 generated in the time interval T1 to T7 are as follows: DD_1 = C1 + C2 + C3-C4-C5 + C6-C7

DD_2=C1+C2-C3-C4+C5-C6+C7

DD_3=C1-C2-C3+C4-C5+C6+C7

DD_4=-C1-C2+C3-C4+C5+C6+C7

DD_5=-C1+C2-C3+C4+C5+C6-C7

DD_6=C1-C2+C3+C4+C5-C6-C7

DD_7=-C1+C2+C3+C4-C5-C6+C7

After time period T7, the decoder of this embodiment receives the digital data DD_1~DD_7, and the decoder can set the decoding matrix DMAX_3 according to the coded data DD_1~DD_7. The decoder can use the decoding matrix DMAX_3 to decode the digital data DD_1~DD_7 (i.e., the digital data DD_1~DD_7 and the decoding matrix DMAX_3 perform inner product operations) to generate a decoded array. The content of the decoding matrix DMAX_3 and the decoding formula of this embodiment are shown below.

[(C1+C2+C3-C4-C5+C6-C7)(C1+C2-C3-C4+C5-C6+C7)(C1-C2-C3+C4-C5+C6+C7)(-C1-C2+C3-C4+C5+

。若將觸控訊號C1~C7皆由類比訊號轉換為數位訊號，觸控訊號C1~C7的數位訊號值便可以明確對應到解碼陣列中的子陣列[7C1]、[7C2]、[7C3]、[7C4]、[7C5]、[7C6]以及[7C7]，因此可透過此方法得到觸控訊號C1~C7的數值以判斷是否有觸控發生。 From the above formula, it can be seen that after the decoder of this embodiment performs decoding, the content of the decoded array is

If the touch signals C1~C7 are converted from analog signals to digital signals, the digital signal values of the touch signals C1~C7 can be clearly corresponded to the sub-arrays [7C1], [7C2], [7C3], [7C4], [7C5], [7C6] and [7C7] in the decoding array. Therefore, the values of the touch signals C1~C7 can be obtained by this method to determine whether a touch occurs.

Please refer to FIG. 4. FIG. 4 shows a circuit diagram of an encoder and an analog front-end circuit in a touch sensing device of an embodiment of the present invention. In this embodiment, the encoder 410 can receive touch signals C1~Cn from multiple capacitive touch units to generate multiple encoded data. The analog front-end circuit 420 can be coupled to the encoder 410 to receive the multiple encoded data. The circuit details of the touch sensing device 400 of FIG. 4 can refer to the embodiment of FIG. 1.

The encoder 410 includes a multiplexer MU1 and an operational circuit AC1. The operational circuit AC1 further includes capacitors CA1~CA2, resistors R1~R2, variable resistors VR1~VR4, and an operational amplifier OPA1. The analog front-end circuit 420 includes capacitors CA3~CA4, resistors R3~R4, and an operational amplifier OPA2.

In this embodiment, the multiplexer MU1 can receive the touch signals C1~Cn and the clock TCLK, and couple the touch signals to the operation circuit AC1 in each of a plurality of time intervals according to the touch signals C1~Cn and the clock TCLK to generate corresponding operation data DAT1 or operation data DAT2.

In the operational circuit AC1 of the present embodiment, the first end of the capacitor CA1 and the first end of the resistor R1 can receive the corresponding operational data DAT1 from the multiplexer MU1 in each of the multiple time intervals, and the second end of the capacitor CA1 and the second end of the resistor R1 can be coupled to the first input end (inverting input end) of the operational amplifier OPA1. The second end of the capacitor CA2 and the second end of the resistor R2 can receive the corresponding operational data DAT2 from the multiplexer MU1 in each of the multiple time intervals, and the first end of the capacitor CA2 and the first end of the resistor R2 can be coupled to the first input end (inverting input end) of the operational amplifier OPA1. The second input end (non-inverting input end) of the operational amplifier OPA1 can receive the clock TCLK. The output end of the operational amplifier OPA1 can be coupled to the first ends of the variable resistors VR1 and VR2. The second end of the variable resistor VR1 can be coupled to the first output end of the operational circuit AC1. The second end of the variable resistor VR2 can be coupled to the second output end of the operation circuit AC1. The first end of the variable resistor VR3 can receive the operation data DAT1, and the second end of the variable resistor VR3 can be coupled to the first output end of the operation circuit AC1. The first end of the variable resistor VR4 can receive the operation data DAT2, and the second end of the variable resistor VR4 can be coupled to the second output end of the operation circuit AC1.

In the analog front-end circuit 420, the first input terminal (inverting input terminal) of the operational amplifier OPA2 can be coupled to the first output terminal of the operational circuit AC1, and the second input terminal (non-inverting input terminal) of the operational amplifier OPA2 can be coupled to the second output terminal of the operational circuit AC1. The resistor R3 and the capacitor CA3 can be set between the first input terminal (inverting input terminal) and the first output terminal (non-inverting output terminal) of the operational amplifier OPA2. The resistor R4 and the capacitor CA4 can be set between the second input terminal (non-inverting input terminal) and the second output terminal (inverting output terminal) of the operational amplifier OPA2.

In the operation details of the encoding action of the encoder 410, the multiplexer MU1 can set multiple time intervals according to the clock TCLK. In each of the multiple time intervals, the multiplexer MU1 can receive the touch signal C1~Cn coupled to the operation circuit AC1 to generate the operation data DAT1 or the operation data DAT2. The operation data DAT1 is positive (i.e., +Cn data is generated), and the operation data DAT2 is negative (i.e., -Cn data is generated). After multiple time intervals, the operation circuit AC1 can obtain the coded data CD_1~CD_n.

Please refer to FIG. 2 and FIG. 4 at the same time. The encoder 410 of FIG. 4 can be used to disclose the internal components of the encoder 210 of FIG. 2, and the embodiment of FIG. 2 can be used to disclose the operation method of the touch sensing device 400 of FIG. 4 in the time period T1-T4. In this embodiment, the multiplexer MU1 of the encoder 410 can receive the touch signals C1-C4. In the time period T1, the multiplexer MU1 can be coupled to the operation circuit AC1 according to the touch signals C2-C4 to generate the operation data DAT1, and the multiplexer MU1 can be coupled to the operation circuit AC1 according to the touch signal C1 to generate the operation data DAT2. . In the time interval T2, the multiplexer MU1 can be coupled to the operation circuit AC1 according to the touch signals C1, C3, and C4 to generate the operation data DAT1, and the multiplexer MU1 can be coupled to the operation circuit AC1 according to the touch signal C2 to generate the operation data DAT2. In the time intervals T3 and T4, the encoder 410 can generate the operation data in the same way, and then convert the encoded data CD_1~CD_4 into digital data DD_1~DD_4 through the analog front-end circuit 420, as shown below: DD_1=-C1+C2+C3+C4

DD_2=C1-C2+C3+C4

DD_3=C1+C2-C3+C4

DD_4=C1+C2+C3-C4

Please refer to FIG. 5A and FIG. 5B. FIG. 5A shows a component configuration diagram of a touch sensing device of an embodiment of the present invention. FIG. 5B shows a component configuration diagram of a touch sensing device of another embodiment of the present invention. In the embodiment of FIG. 5A, the analog front-end circuit 520 and the decoder 530 can be arranged in the chip CHP1, and the encoder 510 is arranged on the panel PNL1 and arranged outside the chip CHP1. In the embodiment of FIG. 5B, the encoder 511, the analog front-end circuit 521 and the decoder 531 can be arranged in the chip CHP2.

Referring to FIG. 6 , FIG. 6 is a flow chart of a signal processing method of an embodiment of the present invention. In step S602, the present embodiment provides a plurality of capacitive touch units, and uses a self-capacitive sensing mode to enable the plurality of capacitive touch units to generate a plurality of touch signals. In step S604, the present embodiment can encode a plurality of touch signals in a plurality of time intervals to generate a coded data in each of a plurality of time segments, and convert each of the coded data into a digital data. In step S606, the present embodiment can decode a plurality of digital data generated in a plurality of time intervals according to a decoding matrix to generate a decoding array. The plurality of sub-arrays of the above-mentioned decoding array can correspond to a plurality of touch signals. The implementation details of the above steps have been described in detail in the aforementioned multiple embodiments.

In summary, the touch sensing device of the present invention uses a self-capacitive sensing mode to use an encoder to encode the touch signals of multiple touch units in multiple time intervals to generate multiple encoded data. Therefore, the touch sensing device of the present invention reduces the required number of analog front-end circuits, thereby reducing the driving current used to drive the analog front-end circuits. In addition, since the touch sensing device of the present invention continuously receives the above-mentioned multiple touch signals in multiple time intervals, the present invention can effectively improve the SNR of the touch sensing device.

Although the present invention has been disclosed as above by the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of the attached patent application.

100: Touch sensor device

CTU_1~CTU_n: Capacitive touch unit

110: Encoder

120: Analog front-end circuit

130:Decoder

C1~Cn: touch signal

CD_1~CD_n: encoding data

DD_1~DD_n: digital data

Claims (18)

A touch sensing device includes: A plurality of capacitive touch units, which generate a plurality of touch signals in a self-capacitive sensing mode; An encoder, coupled to the capacitive touch units, encodes the touch signals in each of a plurality of time intervals to generate a coded data; An analog front-end circuit, coupled to the encoder, converts the coded data into digital data respectively; and A decoder, coupled to the analog front-end circuit, decodes the digital data generated in the time intervals according to a decoding matrix to generate a decoded array, wherein a plurality of sub-arrays of the decoded array correspond to the touch signals in equal proportions. The touch sensing device as described in claim 1, wherein the encoder further comprises: a multiplexer, coupled to the capacitive touch units to receive the touch signals, and providing the touch signals to an operation circuit in the time intervals; and the operation circuit, coupled to the multiplexer, generates a first operation data or a second operation data for each of the touch signals in each time interval of the time intervals and obtains the coded data. The touch sensing device as described in claim 2, wherein the first operation data is the touch signal converted into positive coding data, and the second operation data is the touch signal converted into negative coding data. The touch sensing device as described in claim 1, wherein the digital data generated in the time intervals are decoded according to the decoding matrices by performing an inner product operation on the digital data and the decoding matrices. A touch sensing device as described in claim 1, wherein each of the encoded data and the corresponding digital data are generated in each of a plurality of time intervals. A touch sensing device as described in claim 1, wherein the decoder performs decoding after multiple time periods. A touch sensing device as described in claim 1, wherein the decoding matrix is set according to the encoded data. A touch sensing device as described in claim 2, wherein the encoded data generated by the encoder for the touch signals in each of a plurality of time intervals are different from each other. A touch sensing device as described in claim 1, wherein the analog front-end circuit and the decoder are arranged in a chip, and the encoder is arranged on a panel. A touch sensing device as described in claim 1, wherein the encoder, the analog front-end circuit and the decoder are arranged in a chip. A signal processing method for a touch sensing device includes: Providing a plurality of capacitive touch units to generate a plurality of touch signals corresponding to a self-capacitive sensing mode; In each of a plurality of time intervals, encoding the touch signals to generate a corresponding coded data; Converting each of the coded data into a corresponding digital data; and Decoding the digital data generated in the time intervals according to a decoding matrix to generate a decoding array, wherein a plurality of sub-arrays of the decoding array correspond to the touch signals in equal proportions. The signal processing method as described in claim 11, wherein the step of encoding the touch signals to generate each of the encoded data includes: In each of the time intervals, each of the touch signals generates a first operation data or a second operation data and obtains each of the encoded data. The signal processing method as described in claim 12, wherein the first operation data is the touch signal converted into positive coding data, and the second operation data is the touch signal converted into negative coding data. The signal processing method as described in claim 11, wherein the step of decoding the digital data generated in the time intervals according to the decoding matrices includes: Performing an inner product operation on the digital data and the decoding matrix. A signal processing method as described in claim 11, wherein each of the encoded data and the corresponding digital data is generated in each of a plurality of time intervals. A signal processing method as described in claim 11, wherein decoding is performed after multiple time intervals. A signal processing method as described in claim 11, wherein the decoding matrix is set according to the encoded data. A signal processing method as described in claim 12, wherein the encoded data generated for the touch signals in each of a plurality of time intervals are different from each other.

Images