Coordinate processing circuit for multi-point touch control

Abstract

The invention provides a coordinate processing circuit for multi-point touch control, which comprises a grouping protection unit, a first clear index module and a second clear index module, wherein the grouping protection unit is used for receiving a first touch control signal and outputting a grouping signal; the first clear index module comprises a first clear index unit which is used for outputting a first control signal to a multiway switch; and the second clear index module comprises a second clear index unit which is used for outputting a second control signal to the multiway switch. The coordinate processing circuit executes the clear operation of a buffer area by the first or second control signal outputted by the multiway switch. By adopting the invention, the grouping signal outputted by the grouping protection unit is respectively sent to the first clear index module and the second clear index module, thus multiple touch control points are classified, and pixel information corresponding to the touch control points are stored in the buffer area according to the classifying situation, the phenomena that the touch control points are lost or coordinate points are out of alignment are avoided, and the coordinate processing accuracy and precision of the touch control system are improved.

Description

technical field [0001] The present invention relates to the field of multi-touch technology, in particular to a coordinate processing circuit for multi-touch. Background technique [0002] Currently, the touch control system mainly includes a touch sensor receiving module, a signal processing module and a coordinate processing module. Specifically, the touch sensor receiving module is used to receive one or more touch signals, and transmit the received touch signals to the signal processing module. The signal processing module filters out the noise in the touch signals, and sends the filtered touch signals to the coordinate processing module. Finally, the coordinate processing module determines the central coordinate value of the touch point, and then locates the specific position touched by the user. Here, the main principle of coordinate processing is to compress the one-dimensional signal of the touch point. When there is no touch signal, the corresponding point is rega...

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Problems solved by technology

[0003] However, in the above-mentioned coordinate processing process, the touch system only sets a single buffer zone. When a multi-touch signal occurs, for example, when the compressed signals corresponding to the touch points have different areas and are parallel to each other, there is no touch After the signal points are formed, the buffer is cleared, which will easily cause the signals corresponding to the unformed points to be cleared by mistake, and then some touch points in multi-touch will be lost or the coordinate points will be out of alignment, affecting touch control. The coordinate processing accuracy of the system reduces the user's touch experience

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