TOUCH SENSING APPARATUS

• US 20120169661A1
• Filed: 12/29/2011
• Published: 07/05/2012
• Est. Priority Date: 01/04/2011
• Status: Active Grant

• Current Assignee: Raydium Semiconductor Corporation
• Original Assignee: Raydium Semiconductor Corporation
• Inventors: Chan, Chien-Yu, Wang, Chien-Kuo, Tang, Shang-Ping, Tso, Ko-Yang
• Granted Patent: US 8,773,379 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/04182 Filtering of noise external to the device and not generated by digitiser components
• CPC Class Codes: G06F 3/04186 Touch location disambiguation
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

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 is used to decode the sensed voltages stored in the storage capacitors according to a decoding control timing of the decoding control signal to output the decoded analog data.

Claims

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 decoding the sensed voltages stored in the storage capacitors according to a decoding control timing of the decoding control signal to output the decoded analog data.

2. The touch sensing apparatus of claim 1, wherein each decoding control module respectively decodes the sensed voltages stored in different storage capacitors at different times according to the decoding control timing to output the decoded analog data.

3. The touch sensing apparatus of claim 1, wherein each decoding control module performs an analog filtering process to and decodes the sensed voltages stored in different storage capacitors at the same time to output the decoded analog data.

4. The touch sensing apparatus of claim 3, wherein the each decoding control module performs the analog filtering process to the sensed voltages stored in different storage capacitors in a charge-sharing way.

5. The touch sensing apparatus of claim 1, wherein after the at least one decoding control module decodes all of the sensed voltages stored in the storage capacitors, the storage control module performs a discharge process to the storage capacitors.

6. The touch sensing apparatus of claim 1, further comprising:

a plurality of pins; and

at least one driving/sensing control module, coupled to the logic control module and the plurality of pins, for receiving a driving/sensing control signal of the plurality of control signals from the logic control module and controlling the plurality of pins to perform a plurality of pin functions respectively according to a driving/sensing control timing of the driving/sensing control signal, so that the plurality of pins can sense the sensed voltages from the scan lines of the ITO sensor.

7. The touch sensing apparatus of claim 6, wherein the plurality of pin functions comprises a driving function, a sensing function, a ground function, and a floating function.

8. The touch sensing apparatus of claim 1, further comprising:

an amplifying module, coupled to the at least one decoding control module, for amplifying the decoded analog data; and

an analog/digital converting module, coupled to the amplifying module and the logic control module, for converting the amplified analog data into a digital data and transmitting the digital data to the logic control module.

9. The touch sensing apparatus of claim 8, wherein the logic control module comprises a digital filter used for performing a digital filtering process to the digital data to reduce noise interference.

10. The touch sensing apparatus of claim 1, wherein the logic control module generates the plurality of control signals having different control timings according to an external synchronizing signal, so that the time period of a liquid crystal panel generating noise can be avoided when the plurality of pins perform a sensing function.