Touch sensing apparatus and touch sensing method

Abstract

A touch sensing apparatus sensing a touch point on a touch panel through an ITO sensor is disclosed. The ITO sensor includes first lines arranged along a first direction and second lines arranged along a second direction. The touch sensing apparatus includes first pins, second pins, a driving / sensing control module, and a data processing module. The first pins are coupled to the first lines, and the second pins are coupled to the lines. At a first time, the driving / sensing control module outputs a driving voltage to the first pins and receives a first sensing signal from the second pins; at a second time, the driving / sensing control module outputs a driving voltage to the second pins and receives a second sensing signal from the first pins. The data processing module computes the first sensing signal and the second sensing signal to generate a touch point sensing result.

Description

technical field [0001] The present invention is related to liquid crystal displays; specifically, the present invention relates to a mutual-inductance capacitive touch sensing device and a touch sensing method, which can simultaneously have temporal and spatial filtering and anti-noise functions, and can effectively The signal strength is greatly increased, and the signal / noise ratio (Signal / Noise Ratio) during touch point sensing is greatly improved. Background technique [0002] With the rapid development of technology, thin film transistor liquid crystal displays (TFT LCDs) have gradually replaced traditional displays, and have been widely used in various electronic products such as TVs, flat panel displays, mobile phones, tablet computers, and projectors. For a TFT-LCD with touch function, the touch sensing device is one of its important modules, and its performance directly affects the overall performance of the LCD. [0003] Generally speaking, a conventional liquid c...

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Problems solved by technology

[0004] However, since the driving end and the sensing end of the traditional conductive thin film sensor are independent, that is, the plurality of lines arranged in the X direction of the conductive thin film sensor are fixed as the sensing line and the plurality of lines arranged in the Y direction are fixed as the driving line. Lines, or a plurality of lines arranged in the X direction are fixed as the driving lines and a plurality of lines arranged in the Y direction are fixed as the sensing lines. As for the noise interference encountered during sensing, most of them pass through the digital filter in the touch sensing device Process digital signals after analog-to-digital conversion

Therefore, the traditional touch sensing device can only provide the filtering and anti-noise function on the time axis, and cannot provide the filtering and anti-noise function on the spatial axis, resulting in signal / noise loss when the touch sensing device performs touch point sensing. The ratio is not good, which will affect the accuracy of touch point sensing

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