Sensing circuit and method for sensing touch action on capacitive touch-sensing panel
First Claim
1. A method for sensing a touch action on a capacitive touch-sensing panel, being conducted by a sensing circuit associated with the capacitive touch-sensing panel, and comprising:
- continuously receiving a sense signal from the capacitive touch-sensing panel;
setting or adjusting a level of a reference signal according to the sense signal received in an initial state of the capacitive touch-sensing panel to have a level of the sense signal, when compared with the reference signal, be in a first relation to the level of the reference signal;
comparing a level of the sense signal received in a sensing state of the capacitive touch-sensing panel with the level of the reference signal to generate a comparison signal, wherein the comparison signal is outputted with a first logic level when a level of the sense signal is in the first relation to the level of the reference signal, and the comparison signal is outputted with a second logic level when a level of the sense signal is in a second relation to the level of the reference signal; and
determining whether a touch action is conducted on the capacitive touch-sensing panel according to a compared result of occurrence of the first logic level and occurrence of the second logic level of the comparison signal generated within a preset time period.
1 Assignment
0 Petitions
Accused Products
Abstract
A sense signal is continuously received from a capacitive touch-sensing panel. A reference signal is set or adjusted to have a level of the sense signal be in a first relation to that of the reference signal in an initial state, and the sense signal is compared with the reference signal to generate a comparison signal in a sensing state. The comparison signal is outputted with a first logic level when a level of the sense signal is in the first relation to a level of the reference signal, and outputted with a second logic level when a level of the sense signal is in a second relation to a level of the reference signal. Whether a touch action is conducted is determined according to a compared result of occurrences of the first and second logic levels of the comparison signal generated within a preset time period.
13 Citations
20 Claims
-
1. A method for sensing a touch action on a capacitive touch-sensing panel, being conducted by a sensing circuit associated with the capacitive touch-sensing panel, and comprising:
-
continuously receiving a sense signal from the capacitive touch-sensing panel; setting or adjusting a level of a reference signal according to the sense signal received in an initial state of the capacitive touch-sensing panel to have a level of the sense signal, when compared with the reference signal, be in a first relation to the level of the reference signal; comparing a level of the sense signal received in a sensing state of the capacitive touch-sensing panel with the level of the reference signal to generate a comparison signal, wherein the comparison signal is outputted with a first logic level when a level of the sense signal is in the first relation to the level of the reference signal, and the comparison signal is outputted with a second logic level when a level of the sense signal is in a second relation to the level of the reference signal; and determining whether a touch action is conducted on the capacitive touch-sensing panel according to a compared result of occurrence of the first logic level and occurrence of the second logic level of the comparison signal generated within a preset time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A sensing circuit for sensing a touch action on a capacitive touch-sensing panel, comprising:
-
a comparator having a first input terminal and a second input terminal for continuously receiving a sense signal and a reference signal, respectively, and generating a comparison signal according to a compared result of the sense signal and the reference signal; a variable capacitor coupled to the reference signal for adjusting a level of the reference signal; and a control circuit coupled to the comparator for determining whether a touch action is conducted on the capacitive touch-sensing panel according to the comparison signal, wherein the level of the reference signal is set or adjusted by way of the variable capacitor to have a level of the sense signal, when compared with the reference signal by the comparator, be in a first relation to the level of the reference signal in an initial state of the capacitive touch-sensing panel, and a level of the sense signal is compared with the level of the reference signal to generate the comparison signal in a sensing state, wherein the comparison signal is outputted with a first logic level when a level of the sense signal is in the first relation to the level of the reference signal in the sensing state, and the comparison signal is outputted with a second logic level when a level of the sense signal is in a second relation to the level of the reference signal in the sensing state. - View Dependent Claims (10, 11, 12, 13, 14, 15)
-
-
16. A touch control device, comprising:
-
a capacitive touch-sensing panel where a touch action is conducted; and a sensing circuit for sensing a touch action on the capacitive touch-sensing panel, comprising; a comparator having a first input terminal and a second input terminal for continuously receiving a sense signal and a reference signal, respectively, and generating a comparison signal according to a compared result of the sense signal and the reference signal; a variable capacitor coupled to the reference signal for adjusting a level of the reference signal; and a control circuit coupled to the comparator for determining whether a touch action is conducted on the capacitive touch-sensing panel according to the comparison signal, wherein the level of the reference signal is set or adjusted by way of the variable capacitor to have a level of the sense signal, when compared with the reference signal by the comparator, be in a first relation to the level of the reference signal in an initial state of the capacitive touch-sensing panel, and a level of the sense signal is compared with the level of the reference signal to generate the comparison signal in a sensing state, wherein the comparison signal is outputted with a first logic level when a level of the sense signal is in the first relation to the level of the reference signal in the sensing state, and the comparison signal is outputted with a second logic level when a level of the sense signal is in a second relation to the level of the reference signal in the sensing state. - View Dependent Claims (17, 18, 19, 20)
-
Specification