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Touch Sensing Device

A technology of touch sensing and switching circuits, which is applied in the directions of instruments, calculations, and electrical digital data processing, etc. It can solve problems such as amplifier output saturation, difficulty in effectively eliminating background signals, and degradation of the use quality of capacitive touch panels. Improve the quality of use and avoid the effect of output saturation

Active Publication Date: 2021-01-26
ILI TECHNOLOGY CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This background signal is likely to cause the output of the amplifier to saturate, and on the same capacitive touch panel, the background signal components contained in the touch sensing signals detected at different positions may be different, or different capacitive touch panels It may have different background signal components, so it is difficult to effectively eliminate the background signal, and the use quality of the capacitive touch panel is degraded

Method used

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  • Touch Sensing Device
  • Touch Sensing Device
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Examples

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Embodiment Construction

[0060] figure 1 is a schematic diagram of a touch sensing device according to an embodiment of the present invention, please refer to figure 1. The touch sensing device includes an amplification circuit 102, an analog-to-digital conversion circuit 104, a processing circuit 106, and a correction circuit 108, wherein the analog-to-digital conversion circuit 104 is coupled to the amplification circuit 102 and the processing circuit 106, and the correction circuit 108 is coupled to the input of the amplification circuit 102 Terminal and processing circuit 106. The amplifying circuit 102 is used for receiving the touch sensing signal S1 from its output terminal during the touch sensing period, and amplifying the touch sensing signal S1. The analog-to-digital conversion circuit 104 is used to convert the touch sensing signal S1 into a digital signal, and output the digital signal to the processing circuit 106, and the processing circuit 106 can determine the touch position accordi...

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PUM

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Abstract

The invention provides a touch sensing device. The touch sensing device includes an amplification circuit, an analog-to-digital conversion circuit, a processing circuit and a correction circuit. The amplifying circuit amplifies the touch sensing signal during the touch sensing period. The analog-to-digital conversion circuit converts the amplified touch sensing signal into a digital signal. The processing circuit judges the touch position according to the digital signal. During the touch sensing period, the correction circuit is controlled by the processing circuit to subtract the signal component of the touch sensing signal multiple times. The invention can effectively remove the background signal and greatly improve the use quality of the touch sensing device.

Description

technical field [0001] The invention relates to a sensing device, in particular to a touch sensing device. Background technique [0002] Touch panels are roughly classified into resistive touch panels, capacitive touch panels, optical touch panels, acoustic wave touch panels, and electromagnetic touch panels according to their sensing methods. Since the capacitive touch panel has the advantages of fast response time, good reliability and high durability, the capacitive touch panel has been widely used in electronic products. [0003] In the capacitive touch panel, the capacitance value of the touch panel changes when fingers or conductive materials approach or touch the touch panel. When the touch panel detects a change in the capacitance value, it can determine the position where the finger or the conductive material approaches or touches, and executes the functional operation corresponding to the touched position. In general touch technology, an amplifier is usually used...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/044G06F3/041
CPCG06F3/0418G06F3/044
Inventor 陈俊宾
Owner ILI TECHNOLOGY CORPORATION