TOUCH DEVICE AND DRIVING METHOD OF TOUCH PANEL THEREOF

• US 20140145965A1
• Filed: 11/27/2012
• Published: 05/29/2014
• Est. Priority Date: 11/27/2012
• Status: Abandoned Application

• Current Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Original Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Inventors: Liu, Jui-Ming, Liu, Li-Lin, Chang, Chung-Wen, Tai, Shen-Feng
• Application Number:
  US13/686,046
• Publication Number:
  US 20140145965A1
• 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
• CPC Class Codes: G06F 3/04182 Filtering of noise external to the device and not generated by digitiser components

Abstract

A touch device and a driving method of the touch panel thereof are provided. By randomly driving the scan lines and performing a spatial filtering to the count values corresponding to the voltage noise, a circumstance of a touch position misjudgement caused by voltage noise may be improved.

Claims

1. A driving method of a touch panel, wherein the touch panel comprises a plurality of scan lines and a plurality of sense lines, the driving method comprising:

randomly driving the plurality of scan lines during a sensing period, wherein each of the plurality of scan lines is respectively driven once during the sensing period;

receiving a plurality of touch-sensing signals from the plurality of sense lines; and

determining a touch position of the touch panel according to the plurality of touch-sensing signals.

2. The driving method for the touch panel of claim 1, wherein the step of determining the touch position of the touch panel according to the plurality of touch-sensing signals further comprises:

generating a plurality of count values according to the plurality of the touch-sensing signals;

performing a spatial filtering to the plurality of count values; and

determining the touch position of the touch panel according to a result of the spatial filtering.

3. A touch device, comprising:

a touch panel, comprising a plurality of scan lines and a plurality of sense lines;

a driving module, coupled to the plurality of scan lines, configured for randomly driving the plurality of scan lines during a sensing period, wherein each of the plurality of scan lines is respectively driven once during the sensing period;

a sensing unit, coupled to the plurality of sense lines, configured for receiving a plurality of touch-sensing signals form the plurality of sense lines and generating a plurality of count values according to the plurality of the touch-sensing signals; and

a processing unit, coupled to the driving module and the sensing unit, configured for determining a touch position of the touch panel according to the plurality of count values.

4. The touch device of claim 3, wherein the processing unit further performs a spatial filtering to the plurality of count values, and determines the touch position of the touch panel according to a result of the spatial filtering.

5. The touch device of claim 3, wherein the driving module comprises:

a random number generator, configured for generating a random number value; and

a driving unit, coupled to the random number generator, the plurality of scan lines and the processing unit, configured for randomly driving the plurality of scan lines according to the random number value.

6. The touch device of claim 3, wherein the sensing unit comprises:

an integrator, coupled to the plurality of sense lines, configured for performing an integration respectively to the plurality of touch-sensing signals to obtain a plurality of touch-sensing voltages;

an analog-to-digital converter, coupled to the integrator, configured for converting the plurality of touch-sensing voltages to a plurality of digital signals; and

a counter, coupled to the analog-to-digital converter and the processing unit, configured for generating the plurality of count values according to the count values.