Signal-to-noise ratio enhancing touch sensing apparatus using charge pump method

摘要

A touch sensing apparatus is disclosed. The touch sensing apparatus includes a logic control module, at least one storage control module, and at least one decoding control module. The logic control module is used to generate a plurality of control signals having different control timings. The plurality of control signals includes a storage control signal and a decoding control signal. Each storage control module includes a plurality of storage capacitors, and respectively stores each of sensed voltages in different storage capacitors at different times according to a storage control timing of the storage control signal. The sensed voltages are analog data sensed from scan lines of an ITO sensor. The decoding control module performs analog adding process to the sensed voltages stored in the storage capacitors according to a decoding control timing of the decoding control signal to output decoded analog data with high signal-to-noise ratio (SNR).

主权项

1. A touch sensing apparatus, comprising:
a logic control module, for generating a plurality of control signals having different control timings, and the plurality of control signals comprising a storage control signal and a decoding control signal; at least one storage control module, coupled to the logic control module, each storage control module comprising a plurality of storage capacitors and respectively storing each of sensed voltages in different storage capacitors at different times according to a storage control timing of the storage control signal, wherein the sensed voltages are analog data sensed from scan lines of an ITO sensor; and at least one decoding control module, coupled to the logic control module and the at least one storage control module, for performing an analog adding process to the sensed voltages stored in the storage capacitors according to a decoding control timing of the decoding control signal to output a decoded analog data with high signal-to-noise ratio; wherein each decoding control module performs the analog adding process by using a charge pump method to add the sensed voltages stored in different storage capacitors to output the decoded analog data with high signal-to-noise ratio.