CN-121614050-B - Scanning device and scanning method of touch screen

CN121614050BCN 121614050 BCN121614050 BCN 121614050BCN-121614050-B

Abstract

The invention provides a scanning device and a scanning method of a touch screen, and relates to the field of display, wherein the scanning device comprises an odd scanning circuit, an even scanning circuit and a touch position determining circuit; the odd scanning circuit comprises a plurality of odd scanning channels formed by a plurality of receiving electrodes in a mode of adjacent every two groups, the odd scanning circuit takes the sum of induction signals obtained from two receiving electrodes in the odd scanning channels as odd scanning signals obtained from the odd scanning channels, the even scanning circuit comprises a plurality of even scanning channels formed by a plurality of receiving electrodes in a mode of adjacent every two groups, the even scanning circuit takes the sum of induction signals obtained from two receiving electrodes in the even scanning channels as even scanning signals obtained from the even scanning channels, and the touch position determining circuit determines touch detection results based on the odd scanning signals obtained from the odd scanning channels and the even scanning signals obtained from the even scanning channels so as to improve the accuracy of the touch detection results.

Inventors

LIN JIKUN
SONG WENPING

Assignees

瀚瑞微电子科技(深圳)有限公司

Dates

Publication Date: 20260512
Application Date: 20260129

Claims (9)

1. The scanning device of the touch screen is characterized by comprising a plurality of driving electrodes and a plurality of receiving electrodes, wherein the driving electrodes extend along a first direction and are arranged along a second direction, the receiving electrodes extend along the second direction and are arranged along the first direction, and the first direction and the second direction are crossed; the scanning device includes: The odd scanning circuit comprises a plurality of odd scanning channels which are sequentially formed by the plurality of receiving electrodes in a mode of adjacent pairs and groups, and is configured to take the sum of induction signals acquired from two receiving electrodes in the odd scanning channels as an odd scanning signal acquired from the odd scanning channels; An even scanning circuit including a plurality of even scanning channels formed by the plurality of receiving electrodes in a group-by-group manner, wherein two receiving electrodes in each of the even scanning channels are respectively assigned to two different odd scanning channels, two receiving electrodes in each of the odd scanning channels are respectively assigned to two different even scanning channels, the even scanning circuit being configured to take a sum of induction signals obtained from the two receiving electrodes in the even scanning channels as an even scanning signal obtained from the even scanning channels, and The touch position determining circuit comprises a parity merging and reconstructing circuit, a touch position determining circuit and a touch position determining circuit, wherein the touch position determining circuit is configured to determine a touch detection result based on a plurality of odd scanning signals acquired from a plurality of odd scanning channels and a plurality of even scanning signals acquired from a plurality of even scanning channels; The parity merge reconstruction circuit includes: the scanning signal reconstruction module is configured to obtain an odd scanning signal curve based on a plurality of odd scanning signals and obtain an even scanning signal curve based on a plurality of even scanning signals; The segment segmentation module is configured to segment the odd scanning signal curve into a plurality of odd scanning signal segments and segment the even scanning signal curve into a plurality of even scanning signal segments; The merging module is configured to merge a plurality of odd scanning signal segments and a plurality of even scanning signal segments to obtain a reconstructed scanning signal curve serving as the reconstructed scanning signal based on the condition that the reserved slope is high, and the merging module is configured to reserve the condition that the reserved slope is high and discard the condition that the gradient is low, and discard the condition that the gradient of the odd scanning signal segments and the even scanning signal segments corresponding to the same abscissa segment position is high and discard the condition that the gradient of the odd scanning signal segments and the even scanning signal segments corresponding to the same abscissa segment position is low.
2. The scanning device of claim 1, wherein said odd scan circuit further comprises a plurality of odd scan pins coupled to said touch location determination circuit, each of said odd scan pins corresponding to one of said odd scan channels and coupled to two of said corresponding receiving electrodes in said odd scan channel, to take a sum of sensing signals obtained from two of said receiving electrodes in said odd scan channel as said odd scan signal obtained from said odd scan channel; The even scanning circuit further comprises a plurality of even scanning pins coupled to the touch position determining circuit, wherein each even scanning pin corresponds to one even scanning channel and is coupled to two corresponding receiving electrodes in the even scanning channel, so that the sum of induction signals acquired from the two receiving electrodes in the even scanning channel is taken as the even scanning signal acquired from the even scanning channel.
3. The scanning device of claim 1, wherein the touch location determination circuit comprises: The first touch position operation module is configured to determine the touch detection result based on the odd scanning signals acquired from the odd scanning channels or determine the touch detection result based on the even scanning signals acquired from the even scanning channels.
4. The scanning device of claim 3, wherein the scanning device comprises, The parity merge reconstruction circuit is configured to obtain a reconstruction scan signal based on the odd scan signals and the even scan signals when the accuracy of the touch detection result determined by the first touch position operation module is lower than the set accuracy, and The touch position determining circuit further comprises a second touch position operation module configured to determine the touch detection result based on the reconstruction scanning signal.
5. The scanning device of claim 4, wherein the second touch location operation module comprises: And the tip and center of gravity calculation module is configured to calculate the tip and center of gravity information of the reconstructed scanning signal curve so that the second touch position calculation module determines the touch detection result based on the tip and center of gravity information.
6. The scanning device of claim 4, wherein said parity merge reconstruction circuit further comprises: And the signal smoothing circuit is configured to carry out smoothing processing on the reconstructed scanning signal curve obtained by the merging module so as to enable the second touch position operation module to determine the touch detection result based on the reconstructed scanning signal curve after the smoothing processing.
7. The scanning device of claim 4, wherein the first touch location operation module comprises a differential operation module configured to: Determining a plurality of odd scanning differential signals based on a plurality of odd scanning signals on a plurality of odd scanning channels, so that the first touch position operation module determines the touch detection result based on the plurality of odd scanning differential signals, wherein the odd scanning differential signals are differential signals of odd scanning signals on two adjacent odd scanning channels, or, Determining a plurality of even scanning differential signals based on a plurality of even scanning signals on a plurality of even scanning channels, so that the first touch position operation module determines the touch detection result based on the plurality of even scanning differential signals, wherein the even scanning differential signals are differential signals of even scanning signals on two adjacent even scanning channels; The touch position determining circuit further comprises an accuracy judging circuit, wherein the accuracy judging circuit is configured to determine that the accuracy of the touch detection result determined by the first touch position operation module is lower than the set accuracy when the odd scanning differential signal or the even scanning differential signal is lower than a set signal threshold.
8. A scanning method of a touch screen, wherein the scanning method is based on the scanning device of the touch screen according to any one of claims 1 to 7, and the scanning method comprises: taking the sum of induction signals acquired from two receiving electrodes in an odd scanning channel as an odd scanning signal acquired from the odd scanning channel; Taking the sum of the induction signals acquired from two receiving electrodes in the even scanning channel as an even scanning signal acquired from the even scanning channel; Determining a touch detection result based on the plurality of odd scan signals acquired from the plurality of odd scan channels and the plurality of even scan signals acquired from the plurality of even scan channels, comprising: obtaining a reconstructed scan signal based on the plurality of odd scan signals and the plurality of even scan signals when the accuracy of the touch detection result determined based on the plurality of odd scan signals acquired from the plurality of odd scan channels or the plurality of even scan signals acquired from the plurality of even scan channels is lower than a set accuracy, wherein the reconstructed scan signal comprises obtaining an odd scan signal curve based on the plurality of odd scan signals and an even scan signal curve based on the plurality of even scan signals; dividing the odd scanning signal curve into a plurality of odd scanning signal segments and dividing the even scanning signal curve into a plurality of even scanning signal segments, combining the plurality of odd scanning signal segments with the plurality of even scanning signal segments to obtain a reconstructed scanning signal curve serving as the reconstructed scanning signal based on the condition that the reserved slope is high, and the reserved slope is low, wherein the reserved slope is high in the odd scanning signal segments and the even scanning signal segments corresponding to the same abscissa segment position, and the reserved slope is low in the odd scanning signal segments and the even scanning signal segments corresponding to the same abscissa segment position; and determining the touch detection result based on the reconstruction scanning signal.
9. The scanning method of claim 8, wherein the determining the touch detection result based on the reconstructed scan signal comprises: and calculating the tip and gravity center information of the reconstructed scanning signal curve, and determining the touch detection result based on the tip and gravity center information.

Description

Scanning device and scanning method of touch screen Technical Field The disclosure relates to the technical field of display, in particular to a scanning device and a scanning method of a touch screen. Background The projected capacitive screen is a touch screen adopting a projected capacitive touch technology, and the surface of the projected capacitive screen is provided with a plurality of driving electrodes and a plurality of receiving electrodes, wherein the driving electrodes can be excited and driven, and the receiving electrodes can receive scanning. The touch screen can detect the change of the position capacitance when the finger touches the surface of the screen, so that the position of the finger is calculated, and touch interaction operation is performed. In the related art, it is generally necessary to reconstruct a differential signal of the sensing signals of adjacent receiving electrodes, and determine an actual touch position based on the reconstructed signal. However, if a touching object such as a finger is placed between the two receiving electrodes, the accuracy of the touch detection result for the touching object in the related art is poor. Disclosure of Invention The main objective of the present disclosure is to provide a scanning device and a scanning method for a touch screen, so as to improve accuracy of a touch detection result. In order to achieve the object, a first aspect of the disclosure provides a scanning device of a touch screen, the touch screen comprises a plurality of driving electrodes and a plurality of receiving electrodes, the driving electrodes extend along a first direction and are arranged along a second direction, the receiving electrodes extend along the second direction and are arranged along the first direction and are intersected with the second direction, the scanning device comprises an odd scanning circuit, an even scanning circuit and a touch position determining circuit, the odd scanning circuit comprises a plurality of odd scanning channels which are sequentially formed by the plurality of receiving electrodes in a group mode of adjacent two, the odd scanning circuit is configured to take the sum of induction signals obtained from two receiving electrodes in the odd scanning channels as an odd scanning signal obtained from the odd scanning channels, the even scanning circuit comprises a plurality of even scanning channels which are sequentially formed by the plurality of receiving electrodes in a group mode of adjacent two, two receiving electrodes in each even scanning channel respectively belong to two different odd scanning channels, two receiving electrodes in each odd scanning channel respectively belong to two different even scanning channels, the even scanning circuit is configured to obtain the induction signals from the two receiving electrodes in the even scanning channels in the group mode of adjacent two groups, and the touch position determining circuit is configured to obtain the even scanning signals from the even scanning channels as a touch scanning channels based on the two touch scanning channels. In some embodiments of the present disclosure, the odd scan circuit further includes a plurality of odd scan pins coupled to the touch location determination circuit, each of the odd scan pins corresponding to one of the odd scan channels and coupled to two of the receiving electrodes in the corresponding odd scan channel to use a sum of the sensing signals obtained from the two receiving electrodes in the odd scan channel as an odd scan signal obtained from the odd scan channel, and the even scan circuit further includes a plurality of even scan pins coupled to the touch location determination circuit, each of the even scan pins corresponding to one of the even scan channels and coupled to two of the receiving electrodes in the corresponding even scan channel to use a sum of the sensing signals obtained from the two receiving electrodes in the even scan channel as an even scan signal obtained from the even scan channel. In some embodiments of the present disclosure, a touch location determination circuit includes a first touch location operation module configured to determine a touch detection result based on a plurality of odd scan signals acquired from a plurality of odd scan channels or based on a plurality of even scan signals acquired from a plurality of even scan channels. In some embodiments of the present disclosure, the touch position determination circuit further includes a parity merge reconstruction circuit configured to obtain a reconstructed scan signal based on the plurality of odd scan signals and the plurality of even scan signals when the accuracy of the touch detection result determined by the first touch position operation module is lower than a set accuracy, and a second touch position operation module configured to determine a touch detection result based on the reconstructed scan signal. In some embodiments of the