TOUCH SENSING APPARATUS

• US 20120206389A1
• Filed: 02/09/2012
• Published: 08/16/2012
• Est. Priority Date: 02/10/2011
• Status: Abandoned Application

• Current Assignee: Raydium Semiconductor Corporation
• Original Assignee: Raydium Semiconductor Corporation
• Inventors: Chan, Chien-Yu, Wang, Chien-Kuo, Li, Hung, Liu, Sien-Chun, Tso, Ko-Yang
• Application Number:
  US13/370,203
• Publication Number:
  US 20120206389A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184

Abstract

A touch sensing apparatus includes a plurality of pins, a logic control module, and at least one amplifier module. The logic control module generates a plurality of control signals having different control timings, wherein the control signals include an amplifying control signal and a compensating control signal. Each amplifying module includes an amplifying unit and an automatic compensating unit. The amplifying unit includes a positive input end and a negative input end, wherein the amplifying unit determines, according to the amplifying control signal, a difference between a first sensing voltage and a second sensing voltage respectively received by the positive input end and the negative input end and amplifies the difference to output an analog data. The automatic compensating unit records, according to the compensating control signal, a digital compensation value corresponding to one of the pins and outputs the digital compensation value according to the compensating control signal.

Claims

1. A touch sensing apparatus, comprising:

a plurality of pins;

a logic control module generating a plurality of control signals having different control timings, wherein the control signals comprise an amplifying control signal and a compensating control signal; and

at least one amplifying module, wherein each amplifying module comprises;

an amplifying unit comprising a positive input end and a negative input end, wherein the amplifying unit determines, according to the amplifying control signal, a difference between a first sensing voltage and a second sensing voltage respectively received by the positive input end and the negative input end and amplifies the difference to output an analog data; and

an automatic compensating unit coupled between the logic control module and the amplifying unit, the automatic compensating unit records, according to the compensating control signal, wherein a digital compensation value corresponding to one of the pins and outputs the digital compensation value according to the compensating control signal.

2. The touch sensing apparatus of claim 1, wherein each amplifying module further comprises:

a digital/analog conversion unit coupled with the automatic compensating unit and the amplifying unit, wherein the digital/analog conversion unit converts the digital compensation value outputted from the automatic compensating unit into an analog compensation value and outputs the analog compensation value to the amplifying unit.

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

an analog/digital conversion module coupled with the at least one amplifying module and the logic control module, wherein the analog/digital conversion module converts the analog data outputted from the at least one amplifying module into a digital data and transmits the digital data to the logic control module.

4. The touch sensing apparatus of claim 3, wherein when the logic control module receives the digital data, the logic control module determines whether the digital data needs to be compensated;

if the digital data needs to be compensated, the logic control module outputs the compensating control signal to the automatic compensating unit.

5. The touch sensing apparatus of claim 1, wherein the pins execute a sensing function, a driving function, a grounding function, and/or a floating function.

6. The touch sensing apparatus of claim 5, further comprising:

at least one driving/sensing control module coupled with the pins and the logic control module, wherein the driving/sensing control module controls the pins to execute the sensing function according to a sensing control signal of the control signals and sense a plurality of analog data via a plurality of sensing lines of a conductive thin film sensor.

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

at least one storage control module coupled with the driving/sensing control module and the logic control module, wherein each storage control module comprises a plurality of storage capacitors, the storage capacitors at least store the first sensing voltage and the second sensing voltage according to a storage control signal of the control signals, the first sensing voltage and the second sensing voltage are analog data respectively sensed through a first sensing line and a second sensing line of the conductive thin film sensor, and the first sensing line and the second sensing line are the sensing lines of adjacent channels.

8. The touch sensing apparatus of claim 7, further comprising:

at least one decoding control module coupled with the storage control module and the logic control module, wherein the decoding control module decodes the first sensing voltage and the second sensing voltage outputted from the storage control module according to a decoding control signal of the control signals.

9. The touch sensing apparatus of claim 1, wherein the automatic compensating unit generates the digital compensation value corresponding to the one of the pins according to the compensating control signal.

10. The touch sensing apparatus of claim 7, wherein the conductive thin film sensor executes a discharge process after the storage control module stores the analog data in the storage capacitors.