Touch sensing apparatus and method thereof

• US 8,941,613 B2
• Filed: 06/25/2012
• Issued: 01/27/2015
• Est. Priority Date: 03/30/2012
• Status: Expired due to Fees

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Kwon, Yong Il, Lee, Hyun Suk, Park, Tah Joon
• Primary Examiner(s): Yodichkas, Aneeta
• Application Number:
  US13/532,088
• Publication Number:
  US 20130257789A1
• Time in Patent Office: 946 Days
• Field of Search: 345/174, 345/173
• 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 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• 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

There are provided a touch sensing apparatus and method. The touch sensing apparatus includes a sensing circuit unit detecting a plurality of signals from a plurality of changes in capacitance generated in a plurality of electrodes provided in a panel unit; and a signal processing unit comparing, with predetermined reference levels, levels of at least two signals generated from changes in capacitance in at least two electrodes spaced apart from one another by a predetermined distance or greater, from among the plurality of electrodes, wherein, when the levels of the at least two signals are greater than the predetermined reference levels, the plurality of changes in capacitance are determined to be generated due to noise.

Claims

1. A touch sensing apparatus, comprising:

a sensing circuit unit detecting a plurality of signals from a plurality of changes in capacitance generated in a plurality of electrodes provided in a panel unit; and

a signal processing unit comparing, with predetermined reference levels, levels of at least two signals generated from changes in capacitance in at least two electrodes selected from among the plurality of electrodes provided in the panel unit to be spaced apart from one another by a predetermined distance or greater,

wherein, when the levels of the at least two signals from the at least two electrodes selected to be spaced part from one another by the predetermined distance or greater are greater than the predetermined reference levels, the plurality of changes in capacitance are determined to be generated due to noise.

2. The touch sensing apparatus of claim 1, wherein the sensing circuit unit includes a plurality of capacitance sensing circuits integrating the plurality of changes in capacitance to generate the plurality of signals.

3. The touch sensing apparatus of claim 2, further comprising a controlling unit adjusting a timing at which the capacitance sensing circuits initiate integration of the plurality of changes in capacitance when the plurality of changes in capacitance are determined to be generated due to the noise.

4. The touch sensing apparatus of claim 3, wherein the controlling unit causes the integration of the capacitance sensing circuits to be stopped for a predetermined period of time when the plurality of changes in capacitance are determined to be generated due to the noise.

5. The touch sensing apparatus of claim 4, wherein the controlling unit causes the capacitance sensing circuits to be operated in synchronization with a driving timing at which a driving signal is applied to at least a portion of the plurality of electrodes when the predetermined period of time has elapsed.

6. The touch sensing apparatus of claim 1, wherein the signal processing unit includes:

at least two comparing circuits comparing the levels of the at least two signals with the predetermined reference levels; and

a calculating unit determining whether the plurality of changes in capacitance are generated due to the noise using a comparison result of the at least two comparing circuits.

7. The touch sensing apparatus of claim 6, wherein the calculating unit includes at least one logic circuit.

8. The touch sensing apparatus of claim 1, wherein the at least two electrodes include two electrodes, from among the plurality of electrodes provided in the panel unit, spaced apart from one another by a maximal distance.

9. A touch sensing method, comprising:

selecting at least two signals detected from at least two electrodes selected from among a plurality of electrodes provided in a panel unit to be spaced apart from one another by a predetermined distance or greater, from among a plurality of signals detected from the plurality of electrodes;

comparing levels of the at least two signals with a predetermined reference level; and

determining that the plurality of signals are generated due to noise, when the levels of the at least two signals from the at least two electrodes selected to be spaced part from one another by the predetermined distance or greater are greater than the predetermined reference level.

10. The touch sensing method of claim 9, further comprising integrating changes in capacitance generated in the plurality of electrodes to generate the plurality of signals.

11. The touch sensing method of claim 10, further comprising stopping generating the plurality of signals for a predetermined period of time when the plurality of signals are determined to be generated due to the noise.

12. The touch sensing method of claim 11, further comprising restarting the integrating of the changes in capacitance generated in the plurality of electrodes in synchronization with a driving timing at which a driving signal is applied to at least a portion of the plurality of electrodes, when the predetermined period of time has elapsed.

13. The touch sensing method of claim 9, wherein the selecting of the at least two signals is performed on the at least two electrodes including two electrodes, from among the plurality of electrodes, spaced apart from one another by a maximal distance.

14. The touch sensing method of claim 9, wherein the predetermined reference level includes a plurality of reference levels having different signs.

15. The touch sensing method of claim 14, wherein the levels of the at least two signals are compared with the plurality of reference levels.