WO2022188316A1

WO2022188316A1 - Touch screen display processing circuit, data processing method, and touch event determination method

Info

Publication number: WO2022188316A1
Application number: PCT/CN2021/104652
Authority: WO
Inventors: 黄思衡; 巫启祯; 王文祺
Original assignee: 迪克创新科技有限公司
Priority date: 2021-03-12
Filing date: 2021-07-06
Publication date: 2022-09-15

Abstract

The present application discloses a touch screen display processing circuit and a touch event determination method. The method comprises: receiving N pieces of first channel data respectively output by N receiving channels when the touch screen display is in an on state, wherein the N receiving channels are respectively coupled to N sensing channels of the touch screen display (302); for each of the receiving channels, subtracting reference data from the receiving channel when the touch screen display is in an off state from first channel data corresponding to the receiving channel (304); dividing the result of subtracting the reference data from the first channel data by a normalization factor to produce normalized data corresponding to the receiving channel, wherein the normalization factor indicates the degree of display noise interference caused to the receiving channel (306); and detecting the touch event according to the N pieces of normalized data respectively corresponding to the N receiving channels (308). The method can improve the accuracy of touch detection in a high-noise scenario.

Description

Processing circuit of touch screen display, data processing method and method for judging touch event

technical field

The present application relates to touch data processing technology, and in particular, to a method for judging a touch event on a touch screen display, a processing circuit for the touch screen display, and a data processing method for the touch screen display.

Background technique

With the development of touch-sensing technology, portable electronic products such as cell phones, tablet computers, and in-vehicle systems with touch screens have become quite common. However, the trend of thin and light design reduces the distance between the touch screen module and the display screen module, so that the touch screen is more obviously disturbed by the noise of the display screen, and the accuracy of the touch screen detection of the touch position is reduced. For example, compared to a liquid crystal display (LCD), an organic light emitting diode (OLED) display does not need a backlight layer and a liquid crystal layer, and has a thinner thickness. Although using an OLED display can reduce the thickness of the phone, it increases the capacitance between the display module and the touch screen module. When the OLED display is on and playing a high-noise picture, the display noise will be coupled to the touch sensor of the touch screen through the capacitance of high capacitance value, which reduces the signal-to-noise ratio of the touch sensor and improves the risk of misjudgment of the touch position. possibility.

SUMMARY OF THE INVENTION

One of the objectives of the present application is to disclose a method for judging a touch event on a touch screen display, a data processing method for the touch screen display, and a processing circuit for the touch screen display, so as to solve the above problems in the prior art.

Certain embodiments of the present application disclose a method of determining a touch event on a touch screen display. The method includes: receiving N first channel data respectively output by N receiving channels included in the touch screen display when the touch screen display is in a bright screen state, where N is a positive integer greater than 1, and the N receiving channels are respectively coupled to the N sensing channels of the touch screen display; for each receiving channel of the N receiving channels, the first channel data corresponding to the receiving channel and the touch screen display in the off-screen state are obtained from the The reference data of the receiving channel is subtracted, and the result of subtracting the first channel data and the reference data is divided by a normalization factor to generate normalized data corresponding to the receiving channel, wherein the The normalization factor indicates the degree to which the receiving channel is interfered by display noise; and the touch event is detected according to the N normalized data corresponding to the N receiving channels respectively.

Certain embodiments of the present application disclose a processing circuit for a touch screen display. The processing circuit includes N receive channels and a controller. The N receiving channels are respectively coupled to the N sensing channels of the touch screen display. N is a positive integer greater than 1. Each receiving channel is used for outputting the first channel data according to the sensing result from the corresponding sensing channel when the touch screen display is in the bright screen state. The controller is coupled to the N receiving channels, and is used for obtaining reference data from the receiving channels when the touch screen display is in an off-screen state, and executing the above method.

Certain embodiments of the present application disclose a data processing method for a touch screen display. The data processing method includes: receiving N pieces of first channel data respectively output by N receiving channels of the touch screen display when the touch screen display is in a bright screen state, wherein N is a positive integer greater than 1, and the N pieces of data are The receiving channels are respectively coupled to the N sensing channels of the touch screen display; for each receiving channel in the N receiving channels, the difference between the first channel data corresponding to the receiving channel and the reference data is divided by a normalization factor to generate first normalized data corresponding to the receiving channel, wherein the reference data comes from the receiving channel when the touch screen display is in an off-screen state, and the normalization factor indicates that The degree to which the receiving channel is interfered by display noise; according to the touch states of the N sensing channels and the weighting function corresponding to the receiving channel, the N first normalized data corresponding to the N receiving channels are weighted averaging to generate second normalized data corresponding to the receiving channel; and correcting the first channel data according to the normalization factor and the second normalized data.

Certain embodiments of the present application disclose a processing circuit for a touch screen display. The processing circuit includes N receive channels and a controller. The N receiving channels are respectively coupled to the N sensing channels of the touch screen display. N is a positive integer greater than 1. Each receiving channel is used for outputting the first channel data according to the sensing result from the corresponding sensing channel when the touch screen display is in the bright screen state. The controller is coupled to the N receiving channels, and is used for obtaining reference data from the receiving channels when the touch screen display is in an off-screen state, and executing the above-mentioned data processing method.

The touch sensing solution disclosed in this application can normalize the channel data of the receiving channel according to the similarity between the display noises coupled to different receiving channels, thereby greatly reducing the interference of display noise on touch detection, Reduce the error rate of touch detection in high-noise scenarios, and can meet the needs of arbitrarily adjusting the touch refresh rate and maintain a good signal-to-noise ratio. In addition, by performing a weighted average of the normalized data corresponding to different receiving channels to correct the sensing results of the touch sensor, the touch sensing solution disclosed in this application can not only improve the signal-to-noise of the touch sensing system in a high-noise scenario It can reduce the complexity of the touch sensing system, meet the needs of arbitrarily adjusting the touch refresh rate, and improve the accuracy of touch detection.

Description of drawings

FIG. 1 is a schematic diagram of an embodiment of a touch screen display of the present application.

FIG. 2 is a schematic diagram of an embodiment of the touch screen display shown in FIG. 1 .

FIG. 3 is a flowchart of an embodiment of a method of detecting a touch event on a touch screen display of the present application.

FIG. 4 is a flowchart of an embodiment of a method of detecting a touch event on a touch screen display of the present application.

FIG. 5A is a schematic diagram of an embodiment of a result of detecting a touch event in a high-noise scenario.

FIG. 5B is a schematic diagram of changes of multiple gravity indexes generated by the touch sensing system shown in FIG. 2 using the method shown in FIG. 4 .

FIG. 6 is a flowchart of one embodiment of a method of detecting a touch event on a touch screen display of the present application.

FIG. 7 is a flowchart of one embodiment of a method of detecting a touch event on a touch screen display of the present application.

FIG. 8 is a flowchart of one embodiment of a method of detecting a touch event on a touch screen display of the present application.

FIG. 9 is a flowchart of an embodiment of a data processing method for a touch screen display of the present application.

FIG. 10 is a flowchart of an embodiment of a data processing method for a touch screen display of the present application.

FIG. 11 is a schematic diagram of the standard deviation of each channel data generated by the touch sensing system shown in FIG. 2 using the data processing method shown in FIG. 10 in a high noise scenario.

Detailed ways

Various implementations or examples for implementing the various features of the present application are provided below. Specific examples of components and arrangements are described below to simplify the present application. Of course, these descriptions are only examples and are not intended to limit the application. Furthermore, this application may reuse reference numerals and/or reference numerals in the various embodiments. Such reuse is for the sake of brevity and clarity and does not in itself represent a relationship between the different embodiments and/or configurations discussed. Furthermore, it will be understood that if an element is described herein as being "connected to" or "coupled to" another element, the element may be directly connected or coupled to the other element, or The other element is indirectly connected or coupled to the other element.

The touch sensing system may receive the sensing result of the touch event from the touch sensor by using the receiving channel, so as to detect the touch event. In order to reduce the interference of display noise on touch detection, when the display noise is large, the connection between the touch sensor and the receiving channel is usually disconnected, so that the display noise will not enter the receiving channel from the touch sensor. .

For example, a switch can be provided between the touch sensor and the receiving channel, which can be selectively turned on according to a horizontal synchronization signal (Hsync). The horizontal synchronization signal is an indication signal for screen refresh, and the size of the display noise is related to the screen refresh rate. When the horizontal sync signal has a high signal level, the display is noisy. When the horizontal sync signal has a low signal level, the display noise is small. Thus, the switch described above can be opened when the horizontal sync signal has a high signal level, so that no (or little) significant display noise is coupled from the touch sensor to the receive channel. When the horizontal sync signal transitions from a high signal level to a low signal level, and remains at the low signal level for a period of time, the display noise is much reduced. Therefore, the above switch can be turned on to connect the receiving channel to the touch sensor, so that the receiving channel can receive the sensing result from the touch sensor, and try to improve the signal-to-noise ratio of the touch sensor.

However, since the above-mentioned touch detection method needs to use the horizontal synchronization signal, the host terminal needs to output the horizontal synchronization signal to the touch chip, which increases the complexity of the touch sensing system. In addition, due to the limitation of the screen refresh rate (or the horizontal synchronization signal), the above-mentioned touch detection method is difficult to meet the requirement that the touch refresh rate can be adjusted arbitrarily. Furthermore, the above-mentioned touch detection method is not applicable to different screens. For example, for a screen with a long duration of display noise, using the above touch detection method may cause the receiving channel to disconnect from the touch sensor for a long time, which greatly reduces the time for the sensing result of the touch sensor to be output to the receiving channel. will reduce the signal-to-noise ratio.

The touch sensing solution disclosed in this application can generate the corresponding normalization of different receiving channels according to the similarity between display noises coupled to different receiving channels at the same time without using a horizontal synchronization signal. Data (normalized data), in which the normalized data corresponding to each receive channel has approximately the same components related to display noise. Based on the normalized data corresponding to different receiving channels to determine touch events on the touch screen, the touch sensing solution disclosed in this application can not only improve the accuracy of detecting touch positions in high noise scenarios, but also can Reduce the complexity of the touch sensing system, meet the needs of arbitrarily adjustable touch refresh rate, and maintain a good signal-to-noise ratio. In addition/or, by performing a weighted average of the normalized data corresponding to different receiving channels to correct the sensing results of the touch sensor, the touch sensing solution disclosed in this application can not only improve the touch sensing system in high noise scenarios It can reduce the complexity of the touch sensing system, meet the needs of arbitrarily adjusting the touch refresh rate, and improve the accuracy of touch detection. Further explanation is as follows.

FIG. 1 is a schematic diagram of an embodiment of a touch screen display of the present application. In this embodiment, the touch screen display 100 includes a display screen module 102 and a touch sensing system 104 . The touch sensing system 104 is used to detect a touch event TE, such as a contact or non-contact operation performed by a finger or a stylus on the touch sensing system 104 . Touch sensing system 104 may be implemented as, but not limited to, a capacitive touch screen, and may include touch sensor 110 and processing circuitry 120 .

The touch sensor 110 includes N sensing channels SE ₁ -SE _N , where N is a positive integer greater than one. In the embodiment in which the touch sensor 110 adopts a self-capacitance sensing scheme, each sensing channel can generate a sensing result (ie, one of the N sensing results SR ₁ -SR _N ) according to the corresponding self-capacitance ). In an embodiment where the touch sensor 110 adopts a mutual-capacitance sensing scheme, each sensing channel can generate a sensing result (ie, One of N sensing results SR ₁ -SR _N ). In addition, since the display screen module 102 may couple the display noise to the N sensing channels SE ₁ -SE _N through the N coupling capacitors Cg ₁ -Cg _N , respectively, the N sensing results SR ₁ -SR _N may be respectively Carry display noise from the display screen module 102 .

The processing circuit 120 is coupled to the touch sensor 110 for detecting the touch event TE according to the N sensing results SR ₁ -SR _N. It is worth noting that the display noises included in each of the N sensing results SR ₁ -SR _N generated at the same time (or approximately the same time) may have a certain degree of similarity with each other. The processing circuit 120 may generate corresponding N pieces of normalized data according to the N sensing results SR ₁ -SR _N , wherein components related to display noise in the N pieces of normalized data are the same (or approximately the same) as each other. By processing the N pieces of normalized data, the processing circuit 120 can detect the touch event TE under the condition that the influence of display noise on the detection of the touch event TE is reduced.

In this embodiment, the processing circuit 120 includes N receiving channels 122.1-122.N and a controller 124. The N receiving channels 122.1-122.N are respectively coupled to the N sensing channels SE ₁ -SE _N . Each receiving channel is used to output first channel data (ie, one of the N first channel data CH ₁ -CH _N ) according to the sensing result from the corresponding sensing channel when the touch screen display 100 is in the bright screen state. The controller 124 is coupled to the N receiving channels 122.1-122.N for obtaining the reference data (ie, one of the N reference data CH _1B -CH _NB ) from the receiving channels when the touch screen display 100 is in the off-screen state. , and generate N normalized data corresponding to the N receiving channels 122.1-122.N according to the first channel data and the reference data corresponding to the N receiving channels 122.1-122.N respectively.

For example, the controller 124 may subtract the first channel data corresponding to each receiving channel and the reference data, and divide the result of the subtraction of the first channel data and the reference data by a normalization factor, to generate normalized data corresponding to the receiving channel, wherein the normalization factor indicates the degree to which the receiving channel is disturbed by display noise. Therefore, components related to display noise in the N normalized data corresponding to the N receive channels 122.1-122.N may be identical (or approximately identical) to each other.

For ease of understanding, an exemplary circuit structure is used below to describe the touch sensing solution disclosed in this application. However, this is for illustration purposes. The touch sensing solution disclosed in this application can be applied to other implementations based on the circuit structure shown in FIG. 1 . Please refer to FIG. 2 , which is a schematic diagram of an embodiment of the touch screen display 100 shown in FIG. 1 . The touch screen display 200 includes a touch sensing system 204 and the display screen module 102 shown in FIG. 1 . The touch sensing system 204 includes a touch sensor 210 and a processing circuit 220, which may be embodiments of the touch sensor 110 and the processing circuit 120 shown in FIG. 1, respectively.

The N sensing channels 212.1-212.N included in the touch sensor 210 are used to sense the touch event TE, and generate N sensing results SR ₁ -SR _N accordingly. Taking the sensing channel 212.1 as an example, the sensing channel 212.1 can sense the touch event TE according to the driving signal TX to generate the sensing result SR ₁ , wherein the driving signal TX is provided by the driving circuit (not shown in FIG. 2 ) included in the touch sensing system 204 . . In this embodiment, the N sensing channels 212.1-212.N can be represented by sensing capacitors, and can be coupled to the display screen module 102 through coupling capacitors. For example, the sensing channel 212.1 can be represented by a sensing capacitor C1, wherein the sensing capacitor _C1 can be a self-capacitance or a mutual capacitance corresponding to the sensing channel 212.1, and is coupled to the display screen module 102 through the coupling capacitor Cg1. It is worth noting that since the display noise from the display screen module 102 can be coupled to the sensing channel 212.1 through the coupling capacitor Cg1, the sensing result SR1 ₍ such as the charge _of the capacitor node N1 ₎ can be determined according to the driving signal TX, the touch event TE and coupling capacitance Cg ₁ change.

The processing circuit 220 includes N receive channels 222.1-222.N and a controller 224. The N receiving channels 222.1-222.N can be respectively used as embodiments of the N receiving channels 122.1-122.N shown in FIG. 1 . The N receive channels 222.1-222.N may have the same (or approximately the same) circuit structure. For example, the driving signal for driving the touch sensor 110 may be a frequency modulated vector signal. Therefore, each receiving channel can output the first channel data by performing in-phase and quadrature demodulation (IQ demodulation) on the corresponding sensing result, which can indicate that the sensing result corresponds to amplitude and phase information. In this embodiment, the receiving channel 222.1 includes (but is not limited to) a charge amplifier 232, a low-pass filter 234, an analog-to-digital converter (ADC) 236, an in-phase quadrature demodulation unit 238, multiple digital filters 242.1 and 242.2, and a plurality of downsampling units 244.1 and 244.2.

_The charge amplifier 232 is used to amplify the sensing result SR1 to generate the amplified signal SA. The low-pass filter 234 is used to filter the amplified signal SA to generate the filtered signal SF. The analog-to-digital converter 236 is used to convert the filtered signal SF into a digital signal SD. The in-phase and quadrature demodulation unit 238 is used for performing in-phase and quadrature demodulation on the digital signal SD to generate the in-phase signal SI and the quadrature signal SQ. The digital filter 242.1 is used for filtering the in-phase signal SI to generate a filtered signal SFI. The digital filter 242.2 is used for filtering the quadrature signal SQ to generate the filtered signal SFQ. The downsampling unit 244.1 is used for downsampling the filtered signal SFI to generate in-phase data DI (a part of the first channel data _CH1 ). The downsampling unit 244.2 is used for downsampling the filtered signal SFQ to generate the quadrature data DQ (another part of the first channel data _CH1 ). The in-phase data DI and the quadrature data DQ can reflect the capacitance value of the sensing capacitance C1 (eg, the self-capacitance or mutual capacitance corresponding to the receiving channel 222.1).

The controller 224 is coupled to the _N receiving channels 222.1-222.N for detecting the touch event TE according to the N first channel data _CH1 -CHN output by the N receiving channels 222.1-222.N. For example, the controller 224 can detect the capacitance value of the sensing capacitance corresponding to each receiving channel according to the in-phase data and quadrature data output by each receiving channel, so as to determine the touch position of the touch event TE on the touch sensor 210 . In this embodiment, both the N first channel data CH ₁ -CH _N and the N reference data CH _1B -CH _NB can be implemented as digital data. Accordingly, the controller 224 may be implemented as a digital controller.

Please refer to Figure 3 together with Figure 2. FIG. 3 is a flowchart of an embodiment of a method of detecting a touch event on a touch screen display of the present application. The steps do not necessarily have to be performed in the order shown in FIG. 3 provided that substantially the same results are obtained. For example, the method 300 shown in FIG. 3 may also include other steps. The touch sensing solution disclosed in the present application may adopt alternative implementations based on the method 300 without departing from the spirit and scope of the present application. For the purpose of illustration, the method 300 shown in FIG. 3 is described below in conjunction with the touch screen display 200 shown in FIG. 2 . However, the present application is not limited thereto. It is also possible to apply the method 300 to the touch screen display 100 shown in FIG. 1 .

In step 302, receive N first channel data respectively output by the N receiving channels of the touch screen display when the touch screen display is in a bright screen state, wherein the N receiving channels are respectively coupled to the touch screen display of N sensing channels. For example, the controller 224 may receive N pieces of first channel data CH ₁ -CH _N respectively output by the N receiving channels 222.1-222.N when the touch screen display 200 is in a bright screen state.

In step 304, for each of the N receiving channels, the first channel data corresponding to the receiving channel is subtracted from the reference data from the receiving channel when the touch screen display is in an off-screen state.

In step 306, the result of subtracting the first channel data corresponding to the receiving channel and the reference data is divided by a normalization factor to generate normalized data corresponding to the receiving channel, wherein The normalization factor indicates the degree to which the receive channel is disturbed by display noise.

For example, the display noise coupled from the display screen module 102 to the touch sensor 210 may vary because different coupling paths have different resistances and different coupling capacitances, so that the display coupled to the N sensing channels 212.1-212.N Noise has different magnitudes and phases. However, due to display noise coupled to the N sensing channels 212.1-212.N at the same time (or approximately the same time), common mode noise from the display screen module 102 (eg, from the display screen cathode) coupling the touch sensor 210 , thus, the displayed noise coupled to the N sensing channels 212.1-212.N at the same time (or approximately the same time) may have some degree of similarity. That is, components related to display noise in the _N first channel data _CH1 -CHN output by the N receiving channels 222.1-222.N may have a certain degree of similarity.

For example, the first channel data CH _i output by the receiving channel 222.i can be represented by the formula (1):

CH _i =S _i +N _i +k _i ×N _c

(1)

, where i is any integer between 1 and N, S _i corresponds to the signal component generated by the sensing channel 212.i in response to the touch event TE, and N _i is the random noise associated with the receiving channel 222.i (eg, by noise caused by the circuitry included in the receive channel 222.i). In addition, k _i ×N _c may represent the display noise-related component in the first channel data CH _i , where N _c is the intrinsic component of the display noise of the display screen module 102 coupled to the touch sensor 210 , and k _i is the display screen module 102 The scale factor of the display noise coupled to the receive channel 222.i. _ki may be used as a normalization factor that indicates the degree to which receive channel 222.i is disturbed by display noise.

For the receiving channel 222.1, the controller 224 may subtract the first channel data CH ₁ and the reference data CH _1B , and divide the result of the subtraction by the normalization factor k ₁ to generate the corresponding data of the receiving channel 222.1 Normalized data NC ₁ . In the case where the reference data CH _1B is acquired when the touch screen display 200 is in a screen-off state, the reference data CH _1B hardly carries components related to display noise. Also, the reference data CH _1B may be data having a component of a small amount of random noise. For example, the controller 224 may receive a plurality of second channel data {CH ₁₂ }, which are respectively output by the receiving channel 222.1 at a plurality of time points when the touch screen display 200 is in the off-screen state. The controller 224 can use the average of the plurality of second channel data {CH ₁₂ } as the reference data CH _1B , so that the random noise-related components in the reference data CH _1B are greatly reduced or almost non-existent. Furthermore, the reference data CH _1B may be data not generated in response to the touch event TE. For example, the controller 224 may obtain the reference data CH _1B from the receiving channel 222.1 before the touch event TE occurs, or before no touch event occurs. Therefore, the normalized data NC ₁ can be represented by equation (2):

(CH ₁ -CH _1B )/k ₁ =ΔS ₁ +(N ₁ /k ₁ )+N _c

(2)

, where ΔS ₁ may correspond to the amount of signal change generated by the sensing channel 212.1 due to the touch event TE.

In addition, based on equation (1), the controller 224 can measure the reference data CH _1B in advance and receive the output from the channel 222.1 when the touch screen display 200 is in a high noise scene before the touch event TE occurs (or before the touch event occurs) , and calculate the normalization factor k ₁ corresponding to the receiving channel 222.1.

In step 308, the touch event is detected according to the N normalized data corresponding to the N receiving channels respectively. For example, the controller 224 may detect the touch event TE according to the N normalized data NC ₁ -NC _N corresponding to the N receiving channels 222.1 - 222.N respectively.

In this embodiment, the controller 224 can detect the touch event TE by removing the component related to display noise (ie, N _c ) by subtracting the N normalized data NC ₁ -NC _N two by two. For example, the controller 224 can calculate the normalized data NC _i corresponding to the receive channel 222.i (i is any integer between 1 and N) and K of the N receive channels 222.1-222.N, respectively. The M power of the difference between the K normalized data corresponding to the receiving channel to generate K calculation results, where K is a positive integer greater than 1, and M is a positive real number. In addition, the controller 224 may generate a channel indicator of the receiving channel 222.i according to the K calculation results, such as one of the _N channel indicators idx1 _- idxN corresponding to the N receiving channels 222.1-222.N respectively. Next, the controller 224 can determine whether the touch event TE occurs on the sensing channel 212.i coupled to the receiving channel 222.i according to the channel indicator.

It is worth noting that the components related to display noise in each normalized data are inherent components of display noise coupled to the corresponding receive channel. Therefore, by correlating the N normalized data NC ₁ -NC _N , the controller 224 can generate a processing result that removes components related to display noise, so as to accurately reduce the interference of the display noise. Detects where the touch event TE occurs. In addition, the controller 224 may further control the operation of the touch display 200 according to the detection result of the touch event TE.

For ease of understanding, different implementations for the controller 224 shown in FIG. 2 to calculate the channel index according to the N normalized data NC ₁ -NC _N to detect the touch event TE are given below. However, the present application is not limited thereto. As long as it is a touch sensing solution that can normalize the data of multiple channels to reduce components related to display noise, so as to detect touch events, related alternative implementations still belong to the spirit and scope of the present application.

FIG. 4 is a flowchart of an embodiment of a method of detecting a touch event on a touch screen display of the present application. The method 400 can be an embodiment of the method 300 shown in FIG. 3 . For the purpose of illustration, the method 400 shown in FIG. 4 is described below in conjunction with the touch screen display 200 shown in FIG. 2 . However, the present application is not limited thereto. It is also possible to apply the method 400 to the touch screen display 100 shown in FIG. 1 .

First, in step 402, the touch sensing system 204 may measure the N pieces of first channel data CH ₁ -CH _N respectively output by the N receiving channels 222.1 - 222.N at a certain moment. Step 402 can be an embodiment of step 302 shown in FIG. 3 . For example, when the touch screen display 200 is in the bright screen state, the N receiving channels 222.1-222.N can respectively receive N sensing results SR ₁ -SR _N at the same time (or approximately the same time), so as to generate N sensing results SR 1 -SR N respectively. The first channel data CH ₁ -CH _N . The controller 224 may receive the N first channel data _CH1 -CHN from the _N receive channels 222.1-222.N at the same time (or approximately the same time).

In step 404, the controller 224 may calculate the normalized data corresponding to each receive channel. Step 404 can be used as an implementation of step 304 and step 306 shown in FIG. 3 . For example, the controller 224 may calculate the normalized data of each receiving channel using the above equation (2). In addition, in the embodiment shown in FIG. 2, the channel data output by each receiving channel is vector data including in-phase data and quadrature data. Thus, the normalized data for the N receive channels 222.1-222.N can be represented as the vector NC _V shown below.

NC _V =[NC ₁ ,NC ₂ ,...,NC _N ]

=[(CH ₁ -CH _1B )/k ₁ ,(CH ₂ -CH _2B )/k ₂ ,...,(CH _N -CH _NB )/k _N ]

(3)

In step 406, the controller 224 may calculate the gravity index corresponding to each receiving channel according to the vector NC _V. Taking the receiving channel 222.i (i is any integer between 1 and N) as an example, the gravity index G _i of the receiving channel 222.i can be expressed as:

, where n0 and n1 are positive integers less than N, n0 is less than n1, M is a positive real number, and r ₀ is a non-zero real number. That is, the controller 224 can calculate the difference between the normalized data NC _i corresponding to the receiving channel 222.i and the K normalized data corresponding to the K receiving channels among the N receiving channels 222.1-222.N, respectively. The M power of the gap to produce K computation results (ie |NC _i -NC _n0 | ^M , . . . , |NC _i -NC _n1 | ^M ), where K=(n1-n0+1). In addition, the controller 224 may respectively add the K calculation results by a predetermined value |r ₀ | to generate K addition results, and add the reciprocals of the K addition results to generate the gravity index G _i , which is It can be used as an implementation of the channel index idx _i shown in FIG. 2 .

In step 408, the controller 224 may determine whether the touch event TE occurs on the sensing channel 212.i according to the gravity index G _i .

Steps

406 and 408 can be used as an implementation of step 308 shown in FIG. 3 . For example, when the number of the sensing channels touched at the same time is less than the predetermined number, when the gravity index G _i is less than the threshold, the controller 224 can determine that the touch event TE occurs on the sensing channel 212.i. When the gravity index G _i is greater than or equal to the threshold, the controller 224 may determine that the touch event TE does not occur on the sensing channel 212.i. The above-mentioned predetermined number may be (but not limited to) a quarter or a half of the number of sensing channels that the touch sensor 210 has.

The above details regarding method 400 are for illustrative purposes and are not intended to limit the scope of the present application. For example, the above-mentioned predetermined value |r ₀ | may be replaced by other suitable negative real numbers. For another example, when the number of the sensing channels touched at the same time is greater than the predetermined number, the controller 224 may determine that the touch event TE occurs on the sensing channel 212.i when the gravity index G _i is greater than the threshold. For another example, n1 may be set as the number of receive channels (ie, N) of the processing circuit 220 .

5A and 5B respectively show the results of detecting a touch event in a high-noise scenario. First, please refer to FIG. 5A together with FIG. 2 , which directly uses the difference between the channel data CH _i shown in FIG. 2 and the reference data CH _iB shown in FIG. 2 to determine the sensing channel 212.i shown in FIG. 2 Whether there is a schematic diagram of the pointer being touched. For illustrative purposes, in this embodiment, N is equal to 29, and touch events TE occur on multiple sensing channels 212.7-212.9. As shown in FIG. 5A , since the display noise of the display screen module 102 coupled to the touch sensor 210 is relatively large, the components related to the display noise in the first channel data output by the receiving channel are much larger than the corresponding sensing channel response to touch The signal component produced by the event TE. It is difficult for the controller 224 to determine where the touch event TE occurs according to whether |CH _i -CH _iB | is greater than the threshold.

Please refer to FIG. 5B together with FIG. 2 , which is a schematic diagram of changes of _N gravity indices G ₁ -GN generated by the touch sensing system 204 shown in FIG. 2 using the method 400 shown in FIG. 4 . For illustrative purposes, in this embodiment, N is equal to 29, and touch events TE occur on multiple sensing channels 212.7-212.9. As shown in FIG. 5B , the gravity indexes G ₇ -G ₉ corresponding to the plurality of sensing channels 212.7-212.9 are significantly lower than the gravity indexes corresponding to other sensing channels. That is, the controller 224 can perform normalization processing on the channel data to greatly reduce the interference of display noise, so as to accurately determine the location where the touch event TE occurs.

In some embodiments, the plurality of normalized data may be divided into multiple groups of normalized data to divide the corresponding multiple sensing channels into multiple sets of sensing channels, so that touch detection is performed on each set of sensing channels respectively. By grouping a plurality of normalized data for touch detection, the touch sensing solution disclosed in the present application can shorten the time required for touch detection. Please refer to FIG. 6 together with FIG. 2 , which is a flowchart of an embodiment of a method for detecting a touch event on a touch screen display of the present application. The method 600 can be used as an embodiment of the method 300 shown in FIG. 3 . The method 600 is substantially the same as the method 400 shown in FIG. 4 , the difference between the two is that the method 600 can divide the N normalized data NC ₁ -NC _N into multiple sets of normalized data, and detect the touch event TE accordingly.

In this embodiment, the method 600 can calculate the normalized data corresponding to each receiving channel through

steps

402 and 404 shown in FIG. 4 . Next, in step 605, the controller 224 may divide the N normalized data NC ₁ -NC _N into P groups GP ₁ -GP _P , so as to perform touch detection on the P groups GP ₁ -GP _P respectively , where P is a positive integer. For example, in step 606.1, the controller 224 may adopt the operation of step 406 to calculate the gravity index corresponding to each receiving channel in the group _GP1 . That is, the controller 224 can calculate the receiving channel according to the normalized data corresponding to _one receiving channel in the group _GP1 and the normalized data corresponding to the multiple receiving channels in the group GP1 gravity indicator. Similarly, in step 606.q (q is any integer between 2 and P), the controller 224 can use the operation of step 406 to calculate the gravity index corresponding to each receiving channel in the group GP _q .

In step _608.1 , the controller 224 may use the operation of step 408 to determine whether the touch event TE occurs on the sensing channel corresponding to the group GP1. Similarly, in step 608.q (q is any integer between 2 and P), the controller 224 can use the operation of step 408 to determine whether the touch event TE occurs on the sensing channel corresponding to the group GP _q .

In some embodiments, the step of generating the channel index idx _i corresponding to the receiving channel 222.i according to the above K calculation results may be implemented in other manners. Please refer to FIG. 7 together with FIG. 2 , which is a flowchart of an embodiment of a method for detecting a touch event on a touch screen display of the present application. The method 700 can be used as an embodiment of the method 300 shown in FIG. 3 . The method 700 is substantially the same as the method 400 shown in FIG. 4 , the difference between the two lies in the implementation of generating the channel indicator.

In this embodiment, the method 700 can calculate the normalized data corresponding to each receiving channel through steps 402 and 404 shown in FIG. 4 , such as the vector NC _V shown in the above formula (3). Next, in step 706, the controller 224 may calculate the anti-gravity index corresponding to each receiving channel according to the N normalized data NC ₁ -NC _N. Taking the receiving channel 222.i (i is any integer between 1 and N) as an example, the antigravity index IG _i of the receiving channel 222.i can be expressed as:

, where n0 and n1 are positive integers less than N, n0 is less than n1, and M is a positive real number. That is, the controller 224 can calculate the difference between the normalized data NC _i corresponding to the receiving channel 222.i and the K normalized data corresponding to the K receiving channels among the N receiving channels 222.1-222.N, respectively. The M power of the gap to produce K computation results (ie |NC _i -NC _n0 | ^M , . . . , |NC _i -NC _n1 | ^M ), where K=(n1-n0+1). Additionally, the controller 224 may add the K calculation results to generate the anti-gravity index IG _i , which may be an implementation of the channel index idx _i shown in FIG. 2 .

In step 708, the controller 224 can determine whether the touch event TE occurs on the sensing channel 212.i coupled to the receiving channel 222.i according to the anti-gravity indicator IG _i .

Steps

706 and 708 can be used as an implementation of step 308 shown in FIG. 3 . For example, when the number of the sensing channels touched at the same time is less than the predetermined number, when the anti-gravity indicator IG _i is greater than the threshold, the controller 224 can determine that the touch event TE occurs on the sensing channel 212.i. When the anti-gravity indicator IG _i is less than or equal to the threshold, the controller 224 can determine that the touch event TE does not occur on the sensing channel 212.i. The above-mentioned predetermined number may be (but not limited to) a quarter or a half of the number of sensing channels that the touch sensor 210 has.

The above details regarding method 700 are for illustrative purposes and are not intended to limit the scope of the present application. For example, when the number of the sensing channels touched at the same time is greater than the predetermined number, the controller 224 may determine that the touch event TE occurs on the sensing channel 212.i when the anti-gravity indicator IG _i is less than the threshold. For another example, n1 may be set as the number of receive channels (ie, N) of the processing circuit 220 . For another example, the control 224 may divide the N normalized data NC ₁ -NC _N into multiple sets of normalized data, so that the operations of

steps

706 and 708 are used for each set of normalized data to perform touch detection.

Please refer to FIG. 8 together with FIG. 2 , which is a flowchart of an embodiment of a method for detecting a touch event on a touch screen display of the present application. The method 800 can be used as an embodiment of the method 300 shown in FIG. 3 . The method 800 is substantially the same as the method 400 shown in FIG. 4, the difference between the two lies in the implementation of generating the channel indicator.

In this embodiment, the method 800 can calculate the normalized data corresponding to each receiving channel through

steps

402 and 404 shown in FIG. 4 , such as the vector NC _V shown in the above formula (3). Next, in step 806, the controller 224 may calculate the group index GN _i corresponding to the receiving channel 222.i (i is any integer between 1 and N) according to the N normalized data NC ₁ -NC _N , which can be used as an implementation of the channel index idx _i shown in FIG. 2 .

For example, the controller 224 may calculate the difference between the normalized data NC _i corresponding to the receiving channel 222.i and the K normalized data corresponding to the K receiving channels among the N receiving channels 222.1-222.N, respectively. M power to generate K calculation results (ie |NC _i -NC _n0 | ^M , . . . , |NC _i -NC _n1 | ^M ), where K=(n1-n0+1). In addition, the controller 224 may count the number of the calculation results smaller than the reference value TH among the K calculation results to generate the group index GN _i . The group index GN _i can be expressed as:

, where n0 and n1 are positive integers less than N, and n0 is less than n1. NB(i,j) can be determined by equation (7):

, that is, when |NC _i -NC _n0 | ^M is greater than or equal to the reference value TH, NB(i,j) is equal to 0; when |NC _i -NC _n0 | ^M is less than the reference value TH, NB(i, j) is equal to 1. Thus, the group index GN _i may indicate how similar the normalized data NC _i of the receive channel 222.i is to the normalized data corresponding to the other receive channels.

In step 808, the controller 224 may determine whether the touch event TE occurs on the sensing channel 212.i coupled to the receiving channel 222.i according to the group indicator GN _i . For example, when the number of the sensing channels touched at the same time is less than the predetermined number, when the group index GN _i is greater than the threshold, the controller 224 can determine that the touch event TE does not occur on the sensing channel 212.i. The above-mentioned predetermined number may be (but not limited to) a quarter or a half of the number of sensing channels that the touch sensor 210 has.

In step 810, when it is determined that the touch event TE does not occur on the sensing channel 212.i, the controller 224 may determine that the touch event TE does not occur on the corresponding sensing channel 212.j when NB(i, j) is equal to 1. Additionally, the controller 224 may define the receive channels involved when NB(i,j) equals 1 as the channel set GX _i . Taking the calculation of the group index GN _i of the receiving channel 222.1 as an example, when NB(1,2), NB(1,3) and NB(1,4) are all equal to 1, the controller 224.1 can determine that the touch event has not occurred. Occurs on a plurality of sensing channels 212.1-212.4 and defines _a channel set GXi that includes a plurality of sensing channels 212.1-212.4.

In step 812, the controller 224 may determine whether the detection of the N receiving channels 222.1-222.N has been completed. If yes, go to step 814; otherwise, go to step 806. For example, the controller 224 may determine whether the detection of the N receiving channels 222.1-222.N has been completed by judging whether the respective group indicators of the N receiving channels 222.1-222.N have been calculated.

In step 814, the controller 224 may determine the location where the trigger event TE occurs according to the union of the respective corresponding channel sets of the N receiving channels 222.1-222.N. For example, the above union may indicate a set of sensing channels that are not touched, and the controller 224 may determine the sensing channels other than the set of sensing channels as the location where the touch event TE occurs. Steps 806 to 814 may be used to implement step 308 shown in FIG. 3 .

The above details regarding method 800 are for illustrative purposes and are not intended to limit the scope of the present application. For example, n1 can be set as the number of receive channels (ie, N) that the processing circuit 220 has. For another example, the controller 224 may omit the execution of

steps

812 and 814, and determine the location where the touch event TE occurs according to the channel set corresponding to a certain receiving channel. For another example, the controller 224 may omit the execution of

steps

810 and 814, and determine whether the corresponding sensing channel is touched according to the respective group indicators of the N receiving channels 222.1-222.N.

See Figure 1 again. In this embodiment, the controller 124 may include, but is not limited to, a memory 126 and a processor 128 . Memory 126 may be used to store program instructions. The processor 128 is coupled to the memory 126 and can be used to invoke program instructions stored in the memory 126, so that the controller 124 executes the touch sensing solution disclosed in this application, such as the method 300 shown in FIG. 3 and the method shown in FIG. 4 . 400 , at least one of the method 600 shown in FIG. 6 , the method 700 shown in FIG. 7 , and the method 800 shown in FIG. 8 . Similarly, in some embodiments, the controller 224 shown in FIG. 2 may include a memory and a processor (not shown), wherein the processor may invoke program instructions stored in the memory to cause the controller 224 to Implement the touch sensing scheme disclosed in this application. Since those skilled in the art should be able to understand the details of the operation of the controller 124/224 including the memory and the processor to execute the touch sensing scheme disclosed in the present application after reading the above paragraphs about FIG. 1 to FIG. 8, therefore, Further description is omitted here.

The touch sensing solution disclosed in this application can normalize the channel data of the receiving channel according to the similarity between the display noises coupled to different receiving channels, thereby greatly reducing the interference of display noise on touch detection, Reduce the error rate of touch detection in high-noise scenarios, and can meet the needs of arbitrarily adjusting the touch refresh rate and maintain a good signal-to-noise ratio.

See Figure 1 again. As described above, at the same time (or approximately the same time), the signal components generated by each of the N sensing channels SE ₁ -SE _N in response to the display noise of the display screen module 102 may have a certain degree of similarity with each other. The processing circuit 120 may generate corresponding N pieces of first normalized data according to the N sensing results SR ₁ -SR _N , wherein components related to display noise in the N pieces of first normalized data are approximately the same.

Since the sensing channel near a certain sensing channel is interfered by the noise of the display screen module 102 and may be coupled to this sensing channel, the processing circuit 120 may perform a weighted average on the N first normalized data to generate The second normalized data corresponding to this sensing channel. In addition to the signal components generated by the sensing channel in response to the display noise, the above-mentioned second normalized data may also include signal components generated by other sensing channels in response to the display noise coupled to the signal components of the sensing channel. The processing circuit 120 can more accurately obtain the signal components generated in response to the touch event TE in the sensing result according to the second normalized data.

In this embodiment, the controller 124 can obtain the reference data (ie, one of the N reference data CH _1B - CH _NB ) from the receiving channel when the touch screen display 100 is in the off-screen state, and according to the N receiving channels 122.1 -122.N correspond to the first channel data and reference data respectively, and generate N first normalized data corresponding to the N receiving channels 122.1-122.N. For example, the controller 124 may subtract the first channel data corresponding to each receive channel from the reference data, and divide the difference between the first channel data and the reference data by a normalization factor to obtain First normalized data corresponding to the receiving channel is generated. Since the normalization factor indicates the degree to which the receiving channel is disturbed by display noise. Therefore, components related to display noise in the N first normalized data may be the same (or approximately the same) as each other.

In addition, the controller 124 may perform a weighted average on the N first normalized data according to the degree of influence of the N sensing channels SE ₁ -SE _N on the sensing results received by the receiving channels to generate the Second normalized data corresponding to a channel is received, so as to correct the first channel data. For example, the controller 124 may perform a weighted average on the N first normalized data according to the touch states of the N sensing channels SE ₁ -SE _N and the corresponding weighting function of the receiving channels to generate the second Normalize data. The controller 124 may correct the first channel data according to the normalization factor and the second normalization data.

For ease of understanding, the following uses the touch screen display 200 shown in FIG. 2 to describe the data processing solution of the touch screen display disclosed in the present application. However, this is for illustration purposes. The data processing solution of the touch screen display disclosed in this application can be applied to other implementations based on the circuit structure shown in FIG. 1 .

In the embodiment shown in FIG. 2 , the controller 224 may perform a weighted average on the N first channel data CH ₁ -CH _N according to the degree of influence of the N sensing channels SE ₁ -SE _N on a certain first channel data , to correct this first channel data. By correcting the N first channel data CH ₁ -CH _N , the controller 224 can detect the touch event TE more accurately.

For example, the controller 224 can preliminarily determine the touch position of the touch event TE on the touch sensor 210 according to the in-phase data and quadrature data output by each receiving channel. The controller 224 may also perform a weighted average on the N first channel data CH ₁ -CH _N to correct the in-phase data and quadrature data output by at least one receiving channel to obtain a more accurate sensing capacitance value detection result. The corrected channel data reflects how hard the touch position is pressed. In this embodiment, both the N first channel data CH ₁ -CH _N and the N reference data CH _1B -CH _NB can be implemented as digital data. Accordingly, the controller 224 may be implemented as a digital controller.

Please refer to Figure 9 together with Figure 2. FIG. 9 is a flowchart of an embodiment of a data processing method for a touch screen display of the present application. The steps do not necessarily have to be performed in the order shown in FIG. 9 provided that substantially the same results are obtained. For example, the data processing method 900 shown in FIG. 9 may further include other steps. The touch sensing solution disclosed in the present application may adopt alternative implementations based on the data processing method 900 without departing from the spirit and scope of the present application. For the purpose of illustration, the data processing method 900 shown in FIG. 9 is described below in conjunction with the touch screen display 200 shown in FIG. 2 . However, the present application is not limited thereto. It is also feasible to apply the data processing method 900 to the touch screen display 100 shown in FIG. 1 .

In step 902, receive N first channel data respectively output by the N receiving channels of the touch screen display when the touch screen display is in a bright screen state, wherein the N receiving channels are respectively coupled to the touch screen display of N sensing channels.

In step 904, for each of the N receiving channels, the difference between the first channel data and the reference data corresponding to the receiving channel is divided by a normalization factor to generate the receiving channel Corresponding first normalized data, wherein the reference data comes from the receiving channel when the touch screen display is in an off-screen state, and the normalization factor indicates the degree to which the receiving channel is disturbed by display noise.

For example, the display noise coupled from the display screen module 102 to the touch sensor 210 may vary because different coupling paths have different resistances and different coupling capacitances, so that the display coupled to the N sensing channels 212.1-212.N Noise has different magnitudes and phases. However, due to the display noise coupled to the N sensing channels 212.1-212.N at the same time (or approximately the same time), it is the common mode from the display screen module 102 (eg, from the display cathode) coupled to the touch sensor 210 Noise, therefore, the displayed noise coupled to the N sensing channels 212.1-212.N at the same time (or approximately the same time) may have some degree of similarity. That is, components related to display noise in the _N first channel data _CH1 -CHN output by the N receiving channels 222.1-222.N may have a certain degree of similarity.

For example, the first channel data CH _i output by the receiving channel 222.i can be represented by equation (8):

CH _i =S _i +N _i +k _i ×N _c

(8)

For the receive channel 222.i, the controller 224 may subtract the first channel data CH _i and the reference data CH _iB , and divide the result of the subtraction by the normalization factor k _i to generate the receive channel 222 .i corresponds to the first normalized data NC _i . In the case where the reference data CH _iB is acquired when the touch screen display 200 is in the off-screen state, the reference data CH _1B hardly carries components related to display noise. Also, the reference data CH _iB may be data having a component of a small amount of random noise. Taking the reference data CH _1B as an example, the controller 224 can receive a plurality of second channel data {CH ₁₂ }, which are respectively output by the receiving channel 222.1 at a plurality of time points when the touch screen display 200 is in the off-screen state. The controller 224 can use the average of the plurality of second channel data {CH ₁₂ } as the reference data CH _1B , so that the random noise-related components in the reference data CH _1B are greatly reduced or almost non-existent. Furthermore, the reference data CH _iB may be data not generated in response to the touch event TE. For example, the controller 224 may obtain the reference data CH _iB from the receiving channel 222.i before the touch event TE occurs, or before no touch event occurs. Therefore, the first normalized data NC _i can be expressed based on equation (9):

NC _i =(CH _i -CH _iB )/ _ki =ΔS _i +(N _i / _ki )+N _c

(9)

, where ΔS _i may correspond to the amount of signal change generated by the sensing channel 212.i due to the touch event TE.

In addition, based on equation (8), the controller 224 can measure the reference data CH _iB in advance, and measure the receiving channel 222 before the touch event TE (or before the touch event has not yet occurred) when the touch screen display 200 is in a high noise scene .i outputs the multiple channel data, and calculates the normalization factor ki corresponding to the receiving channel _222.i.

In step 906, according to the touch states of the N sensing channels and the weighting function corresponding to the receiving channels, the N first normalized data corresponding to the N receiving channels are weighted and averaged to generate the N first normalized data corresponding to the N receiving channels. The second normalized data corresponding to the receiving channel is received. Taking the receiving channel 222.i as an example, the controller 224 may, according to the touch states of the N sensing channels 212.1-212.N and the weighting function corresponding to the receiving channel 222.i, perform an operation on the N first normalized data NC ₁ -NC _N performs a weighted average to generate the second normalized data NC _iC corresponding to the receive channel 222.i. Since each first normalized data includes the noise interference received by the sensing channel, the second normalized data NC _iC generated by the weighted average of the N first normalized data NC ₁ -NC _N can be Including the signal components generated by the coupling of noise interference received by other sensing channels to the sensing channel 212.i.

In step 908, the first channel data is corrected according to the normalization factor and the second normalization data. Taking the receiving channel 222.i as an example, the controller 224 can correct the first channel data CH _i according to the normalization factor _ki and the second normalized data NC _iC . In this embodiment, the second normalized data NC _iC can be used as a corrected version of the first normalized data NC _i corresponding to the receiving channel 222.i. Therefore, the controller 224 can correct the first channel data CH _i based on Equation (8). For example, in a high-noise scenario, the component (k _i ×N _c ) related to display noise in the first channel data CH _i may be much larger than the component (N _i ) related to random noise. The controller 224 may subtract the product of the normalization factor _ki and the second normalized data NC _iC from the first channel data CH _i as a corrected version of the first channel data CH _i .

FIG. 10 is a flowchart of an embodiment of a data processing method for a touch screen display of the present application. The method 1000 can be used as an embodiment of the method 900 shown in FIG. 9 . For the purpose of illustration, the method 1000 shown in FIG. 10 is described below in conjunction with the touch screen display 200 shown in FIG. 2 . However, the present application is not limited thereto. It is also possible to apply the method 1000 to the touch screen display 100 shown in FIG. 1 . In addition, the steps do not necessarily have to be performed in the order shown in FIG. 10 if the obtained results are substantially the same.

First, in step 1002, the touch sensing system 204 may measure the N pieces of first channel data CH ₁ -CH _N respectively output by the N receiving channels 222.1-222.N at a certain moment. Step 1002 can be an implementation of step 902 shown in FIG. 9 . For example, when the touch screen display 200 is in the bright screen state, the N receiving channels 222.1-222.N can respectively receive N sensing results SR ₁ -SR _N at the same time (or approximately the same time), so as to generate N sensing results SR 1 -SR N respectively. The first channel data CH ₁ -CH _N . The controller 224 may receive the N first channel data _CH1 -CHN from the _N receive channels 222.1-222.N at the same time (or approximately the same time).

In step 1004, the controller 224 may calculate the first normalized data corresponding to each receive channel. Step 1004 can be an implementation of step 904 shown in FIG. 9 . For example, the controller 224 can calculate the first normalized data of each receiving channel by using the above equation (9). In addition, in the embodiment shown in FIG. 2, the channel data output by each receiving channel is vector data including in-phase data and quadrature data. Therefore, the N pieces of first normalized data NC ₁ -NC _N can be represented as a vector NC _V shown below.

NC _V =[NC ₁ ,NC ₂ ,...,NC _N ]

=[(CH ₁ -CH _1B )/k ₁ ,(CH ₂ -CH _2B )/k ₂ ,...,(CH _N -CH _NB )/k _N ]

(10)

In step 1006, the controller 224 can pre-determine the touch states of the N sensing channels 212.1-212.N when the touch event TE occurs. For example, the controller 224 can at least determine which of the N sensing channels 212.1-212.N are not touched according to the N first channel data CH ₁ -CH _N , and generate a 1×N data accordingly. The matrix isNoTouch, which can be represented as follows:

isNoTouch=[B ₁ ,B ₂ ,...,B _i ,...,B _N ]

(11)

, wherein the element B _i is used to indicate whether the sensing channel 212.i is touched. In this embodiment, when it is determined that the sensing channel 212.i is touched, the controller 224 may set the element B _i to 0. When it is determined that the sensing channel 212.i is not touched, the controller 224 may set the element B _i to 1.

In step 1008, the controller 224 may determine the weighting function corresponding to each of the N receiving channels 222.1-222.N. Taking the receiving channel 222.i as an example, the controller 224 may determine the weighting function Wi corresponding to the receiving channel 222.i, which may include N weighting coefficients wx _i1 -wx corresponding to the N sensing channels 212.1-212.N respectively _iN . In this embodiment, the weighting function Wi can be represented as a 1×N matrix:

Wi=[wx _i1 ,wx _i2 ,...,wx _ii ,...,wx _iN ]

(12)

, where the N weighting coefficients wx _i1 -wx _iN can be 0 or any positive real numbers. The weighting coefficient corresponding to each sensing channel may be determined according to the distance between the sensing channel and the sensing channel 212.i (the number of sensing channels). For example, compared to the sensing channel farther away from the sensing channel 212.i, the noise interference received by the sensing channel that is closer to the sensing channel 212.i may have a greater impact on the sensing channel 212.i . The number of sensing channels between the sensing channel 212.i and one of the N sensing channels 212.1-212.N is less than the number of sensing channels between the sensing channel 212.i and the other sensing channel of the N sensing channels 212.1-212.N In the case of the number of sensing channels between the two, the weighting coefficient corresponding to the sensing channel may be greater than the weighting coefficient corresponding to the other sensing channel.

For example, for the weighting function Wi corresponding to the sensing channel 212.i, the weighting coefficient corresponding to one sensing channel among the N sensing channels 212.1-212.N may be proportional to the difference between the sensing channel 212.i and the sensing channel The inverse of the number of sensing channels. In the case where the weighting coefficient wx _ii corresponding to the sensing channel 212.i is equal to (but not limited to) 1, the weighting function Wi can be represented by the formula (13):

Wi=[…,1/3,1/2,1,1/2,1/3,…,1/|j-i+1|,…]

(13)

, where 1/|j-i+1| is the weighting coefficient wx _ij corresponding to the sensing channel 212.j.

For another example, the weighting coefficient corresponding to one sensing channel among the N sensing channels 212.1-212.N may be proportional to the inverse of the square of the number of sensing channels between the sensing channel 212.i and the sensing channel. In the case where the weighting coefficient wx _ii corresponding to the sensing channel 212.i is equal to (but not limited to) 1, the weighting function Wi can be represented by the formula (14):

Wi=[…,1/9,1/4,1,1/4,1/9,…,1/|j-i+1| ² ,…]

(14)

, where 1/|j-i+1| ² is the weighting coefficient wx _ij corresponding to the sensing channel 212.j.

In step 1010, the controller 224 may determine the N first normalized data NC ₁ -NC according to the touch states of the N sensing channels 212.1-212.N and the N weighting coefficients wx _i1 -wx _iN of the weighting function Wi _N respectively correspond to N weighting factors, and perform a weighted average on the N first normalized data NC ₁ -NC _N accordingly. Steps 1006 to 1010 can be used as an implementation of step 906 shown in FIG. 9 . In this embodiment, the N weighting factors can be determined according to the matrix isNoTouch and the N weighting coefficients wx _i1 -wx _iN . The weighted average result of the N first normalized data NC ₁ -NC _N (that is, the second normalized data NC _iC corresponding to the receiving channel 222.i ) can be expressed as:

, where B _j is an element in the matrix isNoTouch shown in equation (11), used to indicate the touch state of the sensing channel 212.j (j is any integer between 1 and N).

When the touch state of one of the N sensing channels 212.1-212.N indicates that the sensing channel is touched, the controller 224 may set the weighting factor of the first normalized data corresponding to the sensing channel to is 0. When the touch state of the sensing channel indicates that the sensing channel is not touched, the controller 224 may set the weight of the first normalized data corresponding to the sensing channel according to the weighting coefficient corresponding to the sensing channel factor. For example, when it is determined that the sensing channel 212.j is touched, the controller 224 may set the element B _j to 0, so that the weighting factor of the first normalized data NC _j corresponding to the sensing channel 212.j is equal to 0. When it is determined that the sensing channel 212.j is not touched, the controller 224 can set the element B _j to 1, so that the weighting factor of the first normalized data NC _j corresponding to the sensing channel 212.j is equal to “wx _ij / (B ₁ ×wx _i1 +B ₂ ×wx _i2 +…+B _N ×wx _iN )”.

In step 1012, the controller 224 may subtract the product of the normalization factor _ki and the second normalized data NC _iC from the first channel data CH _i to generate the corrected channel data CH _iC (that is, the first channel data CH i C ). The corrected version of the one-channel data CH _i ), as shown in equation (16):

CH _iC =CH _i -NC _iC

(16)

. Step 1012 may be an implementation of step 908 shown in FIG. 9 .

By repeating steps 1006 to 1012, the controller 224 can correct the N first channel data CH ₁ -CH _N , so as to control the operation of the touch display 200 according to the corrected channel data.

It should be noted that the above-mentioned details about the data processing method 1000 are for illustrative purposes and are not intended to limit the scope of the present application. In some embodiments, the matrix isNoTouch may take other implementations. For example, in step 1006, as long as the value of the element B _i when the sensing channel 212.i is not touched can be greater than or much greater than the value of the element B _i when the sensing channel 212.i is touched, the controller 224 may set the value of element B _i when sensing channel 212.i is not touched to a positive real number not equal to 1.

In some embodiments, the weighting function Wi corresponding to the above receiving channel 222.i may be implemented by other forms of weighting functions. For example, since the sensing channel 212.i corresponding to the first channel data CH _i to be corrected may be the touched sensing channel, the weighting coefficient wx _ii of the sensing channel 212.i can be set to 0. For another example, since the sensing channel 212.i corresponding to the first channel data CH _i to be corrected and its adjacent sensing channels may both be touched sensing channels, the weighting coefficient wx of the sensing channel 212.i can be _ii is set to 0, and the M weighting coefficients corresponding to the M sensing channels adjacent to the sensing channel 212.i are set to 0, where M is a positive integer less than N. Taking the weighting coefficient of the sensing channel as an example to be determined according to the inverse of the square of the distance between the two sensing channels, the weighting function Wi can be represented by (but not limited to) formula (17):

Wi=[…,1/9,0,0,0,1/9,…,1/|j-i+1| ² ,…]

(17)

As long as the N first normalized data CH ₁ -CH _N can be weighted and averaged to correct the first The touch sensing solution for normalized data CH ₁ and related alternative implementations still belong to the spirit and scope of the present application.

FIG. 11 is a schematic diagram of the standard deviation of each channel data generated by the touch sensing system 204 shown in FIG. 2 using the data processing method 1000 shown in FIG. 10 in a high-noise scenario. FIG. 11 also shows the standard deviation of each channel data generated without the data processing method 1000 shown in FIG. 10 . Please refer to Figure 11 together with Figure 2. For illustrative purposes, in this embodiment, the touch sensor 210 shown in FIG. 2 may include 29 sensing channels 212.1-212.29 (ie, N equals 29). The measurement result DR1 corresponds to the standard deviation of the first channel data that has not passed the correction process. The measurement result DR2 corresponds to the standard deviation obtained by using the channel data corresponding to the same receiving channel to correct the channel data corresponding to all receiving channels. The measurement result DR3 corresponds to the standard deviation obtained by performing the correction process using the data processing method 1000 shown in FIG. 10 .

The measurement result DR1 is generated as follows. The processing circuit 220 may measure the sensing result of each sensing channel 100 times to generate the standard deviation of the 100 first channel data with respect to the 100 first channel data received by the corresponding receiving channel. For example, the standard deviation corresponding to the receiving channel 222.1 is the standard deviation of the first channel data _CH1 output from the receiving channel 222.1 100 times.

The measurement result DR2 is generated as follows. The processing circuit 220 can measure the sensing results of each sensing channel 100 times, wherein the processing circuit 220 can use the first normalized data corresponding to a certain sensing channel that has not been touched to correct the difference between each receiving channel and each receiving channel. The first channel data output during the next measurement. In this embodiment, it is assumed that the sensing channel 212.29 is an untouched sensing channel. The processing circuit 220 can correct the result generated by the first channel data of each receiving channel according to the first normalized data NC ₂₉ corresponding to the sensing channel 212.29. For example, each time the first channel data CH ₁ output by the receiving channel 222.1 can be corrected by the corresponding first normalized data NC ₂₉ . The processing circuit 220 can generate the standard deviation corresponding to the receiving channel 222.1 according to the calibration results of the 100 first channel data _CH1 corresponding to the 100 measurements. Similarly, the processing circuit 220 can correct the first channel data corresponding to other receiving channels according to the first normalized data NC ₂₉ corresponding to the sensing channel 212.29 in each measurement, thereby generating a standard deviation corresponding to each receiving channel. It can be seen from FIG. 5 that, compared with the measurement result DR1, the standard deviation corresponding to the measurement result DR2 has been greatly reduced. However, the standard deviation of the channel data increases with distance from the sensing channel 212.29. The signal-to-noise ratio of touch-sensing systems still needs to be improved.

Compared with the measurement result DR1 and the measurement result DR2, the standard deviation corresponding to the measurement result DR3 is not only greatly reduced, but also has a good correction effect when correcting the channel data corresponding to the sensing channel 212.29 farther away. That is to say, through the weighted average correction process disclosed in the present application, the touch sensing system can still have a good signal-to-noise ratio in a high-noise scenario.

See Figure 1 again. In this embodiment, the controller 124 may include, but is not limited to, a memory 126 and a processor 128 . Memory 126 may be used to store program instructions. The processor 128 is coupled to the memory 126 and can be used to call program instructions stored in the memory 126, so that the controller 124 executes the touch sensing solution disclosed in this application, such as the data processing method 900 shown in FIG. 9 and the data processing method 900 shown in FIG. 10 . At least one of the data processing methods 1000. Similarly, in some embodiments, the controller 224 shown in FIG. 2 may include a memory and a processor (not shown), wherein the processor may invoke program instructions stored in the memory to cause the controller 224 to Implement the touch sensing scheme disclosed in this application. As those skilled in the art will understand that the controller 124/224 including the memory and the processor implements the touch sensing scheme disclosed in the present application after reading the above paragraphs about FIG. 1, FIG. 2, FIG. 9 to FIG. 11 Therefore, further descriptions are not repeated here.

The foregoing description briefly sets forth features of certain embodiments of the present application so that those skilled in the art may more fully understand the various aspects of the present application. It should be appreciated by those skilled in the art that they can easily use the present application as a basis to design or modify other processes and structures to achieve the same purposes and/or achieve the same advantages as the above-described embodiments. Those skilled in the art should understand that these equivalent embodiments still belong to the spirit and scope of the present application, and various changes, substitutions and alterations can be made without departing from the spirit and scope of the present application.

Claims

A method for detecting a touch event on a touch screen display, comprising:

Receive N first channel data respectively output by the N receiving channels of the touch screen display when the touch screen display is in a bright screen state, wherein N is a positive integer greater than 1, and the N receiving channels are respectively coupled to the N sensing channels of the touch screen display;

For each of the N receive channels:

subtracting the first channel data corresponding to the receiving channel and the reference data from the receiving channel when the touch screen display is in an off-screen state; and

dividing the result of subtracting the first channel data and the reference data by a normalization factor to generate normalized data corresponding to the receive channel, wherein the normalization factor indicates the receive channel the extent to which the channel is disturbed by display noise; and

The touch event is detected according to the N normalized data corresponding to the N receiving channels respectively.
The method of claim 1, further comprising:

Before the touch event occurs, the reference data from the receiving channel when the touch screen display is in an off-screen state is obtained.
The method of claim 1, wherein the step of detecting the touch event according to the N normalized data corresponding to the N receiving channels respectively comprises:

Calculate the M power of the difference between the normalized data corresponding to the receiving channel and the K normalized data corresponding to the K receiving channels in the N receiving channels, to generate K calculation results, wherein K is a positive integer greater than 1, M is a positive real number;

generating a channel index of the receiving channel according to the K calculation results; and

According to the channel indicator, it is determined whether the touch event occurs on the sensing channel coupled to the receiving channel.
The method of claim 3, wherein the step of generating the channel index according to the K calculation results comprises:

adding a predetermined value to the K calculation results, respectively, to generate K addition results; and

The reciprocals of the K addition results are added to generate the channel indicator.
5. The method of claim 4, wherein the predetermined value is a positive real number.
The method of claim 4, wherein the step of judging whether the touch event occurs on the sensing channel according to the channel indicator comprises:

When the channel index is less than a threshold, determining that the touch event occurs on the sensing channel; and

When the channel index is greater than or equal to the threshold, it is determined that the touch event does not occur on the sensing channel.
The method of claim 3, wherein the step of generating the channel index according to the K calculation results comprises:

The K calculation results are added to generate the channel indicator.
The method of claim 7, wherein the step of judging whether the touch event occurs on the sensing channel according to the channel index comprises:

When the channel index is greater than a threshold, determining that the touch event occurs on the sensing channel; and

When the channel index is less than or equal to the threshold, it is determined that the touch event does not occur on the sensing channel.
The method of claim 3, wherein the step of generating the channel index according to the K calculation results comprises:

Calculate the number of calculation results smaller than the reference value among the K calculation results to generate the channel index.
The method of claim 9, wherein the step of judging whether the touch event occurs on the sensing channel according to the channel indicator comprises:

When the channel index is greater than the threshold, it is determined that the touch event does not occur on the sensing channel.
The method according to claim 10, wherein one calculation result of the K calculation results smaller than the reference value comes from normalized data corresponding to the receiving channel and another calculation result different from the receiving channel receiving normalized data corresponding to a channel; the step of detecting the touch event according to the N normalized data corresponding to the N receiving channels respectively includes:

When it is determined that the touch event does not occur on the sensing channel, it is determined that the touch event does not occur on the sensing channel coupled to the other receiving channel.
The method according to any one of claims 3 to 11, wherein the step of detecting the touch event according to the N normalized data respectively corresponding to the N receiving channels further comprises:

The N normalized data are divided into P groups, wherein the normalized data and the K normalized data are located in the same group of the P groups.
The method according to any one of claims 1 to 11, wherein the N pieces of first channel data are received at the same time when the touch screen display is in the bright screen state.
The method according to any one of claims 1 to 11, wherein the step of obtaining the reference data from the receiving channel when the touch screen display is in the off-screen state comprises:

receiving a plurality of second channel data respectively output by the receiving channel at a plurality of time points when the touch screen display is in the off-screen state; and

The average of the plurality of second channel data is used as the reference data.
A processing circuit for a touch screen display, comprising:

N receiving channels, respectively coupled to the N sensing channels of the touch screen display, where N is a positive integer greater than 1; The sensing result of the channel outputs the first channel data; and

a controller, coupled to the N receiving channels, for obtaining reference data from the receiving channels when the touch screen display is in an off-screen state, and performing the method according to any one of the above claims 1 to 14 .
16. The processing circuit of claim 15, wherein the controller comprises:

memory for storing program instructions; and

A processor, coupled to the memory, for invoking program instructions stored in the memory, so that the controller executes the method according to any one of claims 1 to 14.
A data processing method for a touch screen display, comprising:

Receive N first channel data respectively output by the N receiving channels of the touch screen display when the touch screen display is in a bright screen state, wherein N is a positive integer greater than 1, and the N receiving channels are respectively coupled to the N sensing channels of the touch screen display;

For each of the N receiving channels, the difference between the first channel data corresponding to the receiving channel and the reference data is divided by a normalization factor to generate a first normalized corresponding to the receiving channel Normalization data, wherein the reference data comes from the receiving channel when the touch screen display is in an off-screen state, and the normalization factor indicates the degree to which the receiving channel is disturbed by display noise;

According to the touch states of the N sensing channels and the weighting function corresponding to the receiving channels, the N first normalized data corresponding to the N receiving channels are weighted and averaged to generate the first normalized data corresponding to the receiving channels. 2. Normalized data; and

The first channel data is corrected based on the normalization factor and the second normalization data.
The data processing method according to claim 17, wherein the weighting function comprises N weighting coefficients corresponding to the N sensing channels respectively, and performing a weighted average on the N first normalized data to obtain The step of generating the second normalized data includes:

According to the touch states of the N sensing channels and the N weighting coefficients, determine N weighting factors corresponding to the N first normalized data respectively; and

The N first normalized data is weighted and averaged according to the N weighting factors to generate the second normalized data.
The data processing method of claim 18, wherein the N sensing channels comprise a first sensing channel, a second sensing channel and a third sensing channel, the first sensing channel is coupled to the receiving channel , the number of sensing channels between the first sensing channel and the second sensing channel is smaller than the number of sensing channels between the first sensing channel and the third sensing channel, and the weighting corresponding to the second sensing channel The coefficient is greater than the weighting coefficient corresponding to the third sensing channel.
The data processing method of claim 18, wherein the N sensing channels include a first sensing channel and a second sensing channel, the first sensing channel is coupled to the receiving channel, and the second sensing channel is coupled to the receiving channel. The weighting coefficient corresponding to the sensing channel is proportional to the inverse of the number of sensing channels between the first sensing channel and the second sensing channel.
The data processing method of claim 18, wherein the N sensing channels include a first sensing channel and a second sensing channel, the first sensing channel is coupled to the receiving channel, and the second sensing channel is coupled to the receiving channel. The weighting coefficient corresponding to the sensing channel is proportional to the inverse of the square of the number of sensing channels between the first sensing channel and the second sensing channel.
The data processing method according to any one of claims 19 to 21, wherein the weighting coefficient corresponding to the first sensing channel is equal to 1.
The data processing method according to any one of claims 19 to 21, wherein the weighting coefficient corresponding to the first sensing channel is equal to 0, and the M sensing channels adjacent to the first sensing channel correspond to The M weighting coefficients of are equal to 0, where M is a natural number less than N.
The data processing method according to any one of claims 18 to 21, wherein the step of determining the N weighting factors corresponding to the N first normalized data respectively comprises:

When the touch state of one of the N sensing channels indicates that the sensing channel is touched, setting the weighting factor of the first normalized data corresponding to the sensing channel to 0; and

When the touch state of the sensing channel indicates that the sensing channel is not touched, the weighting factor of the first normalized data corresponding to the sensing channel is set according to the weighting factor corresponding to the sensing channel.
The data processing method of claim 17, wherein the step of correcting the first channel data according to the normalization factor and the second normalization data comprises:

The product of the normalization factor and the second normalized data is subtracted from the first channel data as a corrected version of the first channel data.
The data processing method of claim 17, further comprising:

Before the touch event occurs, the reference data from the receiving channel when the touch screen display is in an off-screen state is obtained.
The method according to any one of claims 17, 18, 19, 20, 21, 25 or 26, wherein the N pieces of first channel data are when the touch screen display is in the bright screen state received at the same time.
The method of any one of claims 17, 18, 19, 20, 21, 25 or 26, further comprising:

receiving a plurality of second channel data respectively output by the receiving channel at a plurality of time points when the touch screen display is in the off-screen state; and

The average of the plurality of second channel data is used as the reference data.
A processing circuit for a touch screen display, comprising:

N receiving channels, respectively coupled to the N sensing channels of the touch screen display, where N is a positive integer greater than 1; The sensing result of the channel outputs the first channel data; and

a controller, coupled to the N receiving channels, for obtaining reference data from the receiving channels when the touch screen display is in an off-screen state, and executing the data described in any one of the above claims 17 to 28 Approach.
The processing circuit of claim 29, wherein the controller comprises:

memory for storing program instructions; and

A processor, coupled to the memory, is configured to invoke program instructions stored in the memory, so that the controller executes the data processing method according to any one of claims 17 to 28.