Active touch sensing circuit apparatus

Abstract

The invention discloses an active matrix touch sensing circuit apparatus suitable for a touch panel. The active matrix touch sensing circuit apparatus comprises a sensing unit, a resistor, and a transistor. The resistor is connected with the sensing unit and a first scan line. A control end of the transistor is connected with the sensing unit, an input end of the transistor is connected with a second scan line, and an output end of the transistor is connected with a read out line. When a sensing value of a body touch sensing unit is changed, the input wave form of the control end is changed, the output end outputs an open current, and the read out line transmits the open current.

Description

technical field [0001] The present invention relates to an active touch sensing circuit, in particular to a sensing circuit composed of capacitors, resistors and transistors, which uses a momentary large open current as a sensing signal to reduce power consumption and increase Reaction time. Background technique [0002] The touch panel has a wide range of applications, including portable information, consumer and communication products, financial or commercial purposes, factory automation control systems, and public information purposes. In addition, since major manufacturers launched popular touch mobile devices such as smart phones and tablet computers, users have re-experienced the convenience of touch products, and at the same time, another change has occurred in operating habits. Consumer goods have begun to Try to introduce a more convenient touch solution to replace mechanical switches that are prone to aging, failure, dust, and corrosion. The planar configuration i...

AI Technical Summary

Problems solved by technology

[0008] However, the aforementioned conventional touch-sensitive liquid crystal display must be controlled by an additional gate electrode and a scanning line G 1 -G n drive, adding additional cost

And it uses voltage as the sensing signal, and reads out the voltage value through the source follower of the sensing circuit, which is easily affected by the variation between components

This case uses the concept of capacitive voltage division for sensing, so the sensing signal is weak and difficult to read

Finally, when it is not touched, there is still a large current flowing through it, so its power consumption is large, which is not conducive to the use of large-area touch panels

[0009] To sum up, the conventional touch sensing circuit of the touch panel cannot meet the required requirements, so it is necessary to invent a touch sensing circuit with high sensing signal strength, so as to generate high sensing signal strength and can Reduce the cost required to read the circuit

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