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Touch detection system and method

A detection system and processing system technology, applied in the field of capacitive touch panel touch detection and capacitive touch detection system, can solve the problems of complex circuit, easy to be interfered by external noise, and high system power consumption, and achieve suppression of common The effect of modulo interference

Active Publication Date: 2013-05-22
SUZHOU PIXCIR MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This detection principle is to obtain the absolute capacitance of each sensing line on the sensing matrix at the same time, and then process the obtained data. The system consumes high power and the corresponding circuit is complex during the use of the above method.
Another method is to sequentially scan the sensing lines in one direction, and then process the data of each scanning line, but this method is susceptible to external noise interference

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  • Touch detection system and method
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Embodiment Construction

[0010] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0011] see figure 1 As shown, the capacitive touch detection system of the present invention includes a plurality of sensing lines arranged in two directions and a detection processing system. The two directions refer to the horizontal direction, which is the X direction, and the vertical direction, which is the Y direction; the detection and processing system includes an analog switch and a comparator. Wherein, the analog switch means that it can be selectively closed through programming, so it is also called a programmable analog switch. The induction lines X1, X2...Xn and Y1, Y2...Yn in the two directions are all connected to the comparator after passing through the respective programmable analog switches, and each induction line is relatively ground itself Inductive capacitances are also generated individually.

[0012] When there is a pulse from...

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Abstract

The invention relates to a touch detection system comprising a plurality of bidirectional induction lines and a detection processing system. The detection processing system comprises a programmable analog switch and a comparer. The touch detection system and method disclosed by the invention are simple; in addition, the two induction lines are respectively connected to two input ends of the comparer by utilizing the comparer so as to form a bridge type detection circuit with the function of restraining a common-mode interference. Therefore, even though the interference of an outside environment is large, the influence on the whole system is reduced to the minimum.

Description

technical field [0001] The invention relates to the field of touch detection, in particular to a touch detection method of a capacitive touch panel and a capacitive touch detection system. Background technique [0002] Today, touch panels have been widely integrated in various electronic products as input devices. Users only need to slide or touch objects (such as hands and stylus) on the panel to make the cursor move or move relative to the touch panel. Absolute movement can complete various inputs including text writing, scrolling windows and virtual buttons. Among them, the capacitive touch panel is a kind of touch panel that can move a finger on a smooth panel to control the movement of the cursor. When the finger touches the panel, the first sensing direction and the second sensing direction of the touched position The magnitude of the sensing energy in the direction will change. By detecting the magnitude of the sensing energy, it can be judged whether the object touc...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/044
Inventor 刘杰
Owner SUZHOU PIXCIR MICROELECTRONICS