US 2013/0154997 A1 · SENSING DEVICE, TOUCH SENSING SYSTEM, AND DISPLAY DEVICE

Abstract

A sensing device placed in a touch sensing system of a display device includes a selector, a sensing module, and a detection module for determining touch signals generated by the touch sensing system. The selector selects two of the touch signals according to at least one selection control signal. The sensing module comprises a first differential amplifier for comparing the selected touch signals and producing a first differential signal according to first control signals. According to second control signals, the detection module receives the first differential signal, generates an averaged sensing value and a reference value, and compares the averaged sensing value with the reference value to produce a second differential signal. Thereby, the touch sensing system uses the second differential signal to generate the first control signals and the second control signals to control the operation of the touch sensing system.

Claims22

Dependent claims

A sensing device for determining N touch signals, wherein N is a positive integer, and the sensing device comprising:

a selector for selecting an ith touch signal and a (i+1)th touch signal from the touch signals according to at least one selection control signal, i is a positive integer from 1 to (N−1);
a sensing module connecting to the selector in series and comprising a first differential amplifier to compare the selected touch signals and produce a first differential signal according to a plurality of first control signals;
and
a detection module connecting to the sensing module in series for according to a plurality of second control signals, generating an averaged sensing value and a reference value from the first differential signal and comparing the average d sensing value with the reference value to produce a second differential signal.

1 more element

A touch sensing system, comprising:

a touch input interface comprising N signal generation circuits for providing N touch signals to the selector;
a sensing device connecting to the touch input interface in series and comprising:
a selector for selecting an ith touch signal and a (i+1)th touch signal from the touch signals according to at least one selection control signal, i is a positive integer from 1 to (N−1);
a sensing module connecting to the selector in series and comprising a first differential amplifier to compare the selected touch signals and produce a first differential signal according to a plurality of first control signals;
and
a detection module connecting to the sensing module in series for according to a plurality of second control signals, generating an averaged sensing value and a reference value from the first differential signal and comparing the averaged sensing value and the reference value to produce a second differential signal;
and
a control module connecting to the detection module in series for according to the second differential signal, generating the first control signals and the second control signals.

5 more elements

Dependencies are inferred from the claim text.

Sensing device, touch sensing system, and display device

Life of this patent

Sensing device, touch sensing system, and display device

Life of this patent

Abstract

Claims22