Image display systems
First Claim
Patent Images
1. An image display system, comprising:
- a touch sensing circuit comprising at least one voltage storing unit to generate a corresponding voltage when a capacitance variation caused by a touch event occurs, wherein the voltage storing unit comprises;
a first capacitor having a first terminal coupled to an alternating current (AC) common voltage from a common electrode and a second terminal coupled to a first node;
a first switching element having a first terminal coupled to the second terminal of the first capacitor and a second terminal coupled to the AC common voltage; and
a second switching element having a first terminal coupled to the second terminal of the first capacitor,wherein the touch sensing circuit further comprises an integration unit coupled to the second terminal of the second switching element to integrate the corresponding voltage thereby generating an output signal, andwherein the integration unit comprises;
a third switching element having a first terminal coupled to the second terminal of the second switching element, and a second terminal;
a second capacitor having a first terminal coupled to the second terminal of the third switching element, and a second terminal;
a fourth switching element having a first terminal coupled to the second terminal of the third switching element, and a second terminal coupled to a low voltage level of the AC common voltage;
a fifth switching element having a first terminal coupled to the second terminal of the second capacitor, and a second terminal;
a sixth switching element having a first terminal coupled to the second terminal of the second capacitor, and a second terminal coupled to the low voltage level;
an operational amplifier having an inversion input terminal coupled to the second terminal of the second capacitor, a non-inversion input terminal coupled to the low voltage level, and an output terminal;
a third capacitor coupled between the inversion input terminal and the output terminal of the operational amplifier;
a seventh switching element coupled between the inversion input terminal and the output terminal of the operational amplifier; and
an eighth switching element coupled to the output terminal of the operational amplifier to output the output signal.
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Abstract
Image display systems are provided, in which a touch sensing circuit includes at least one voltage storing unit to generate a corresponding voltage when a capacitance variation caused by a touch event occurs. The voltage storing unit includes a first capacitor having a first terminal coupled to an alternating current (AC) common voltage from a common electrode and a second terminal coupled to a first node, a first switching element having a first terminal coupled to the second terminal of the first capacitor and a second terminal coupled to the AC common voltage, and a second switching element having a first terminal coupled to the second terminal of the first capacitor.
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Citations
16 Claims
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1. An image display system, comprising:
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a touch sensing circuit comprising at least one voltage storing unit to generate a corresponding voltage when a capacitance variation caused by a touch event occurs, wherein the voltage storing unit comprises; a first capacitor having a first terminal coupled to an alternating current (AC) common voltage from a common electrode and a second terminal coupled to a first node; a first switching element having a first terminal coupled to the second terminal of the first capacitor and a second terminal coupled to the AC common voltage; and a second switching element having a first terminal coupled to the second terminal of the first capacitor, wherein the touch sensing circuit further comprises an integration unit coupled to the second terminal of the second switching element to integrate the corresponding voltage thereby generating an output signal, and wherein the integration unit comprises; a third switching element having a first terminal coupled to the second terminal of the second switching element, and a second terminal; a second capacitor having a first terminal coupled to the second terminal of the third switching element, and a second terminal; a fourth switching element having a first terminal coupled to the second terminal of the third switching element, and a second terminal coupled to a low voltage level of the AC common voltage; a fifth switching element having a first terminal coupled to the second terminal of the second capacitor, and a second terminal; a sixth switching element having a first terminal coupled to the second terminal of the second capacitor, and a second terminal coupled to the low voltage level; an operational amplifier having an inversion input terminal coupled to the second terminal of the second capacitor, a non-inversion input terminal coupled to the low voltage level, and an output terminal; a third capacitor coupled between the inversion input terminal and the output terminal of the operational amplifier; a seventh switching element coupled between the inversion input terminal and the output terminal of the operational amplifier; and an eighth switching element coupled to the output terminal of the operational amplifier to output the output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An image display system, comprising:
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a touch sensing circuit comprising; first and second voltage storing units each generating a corresponding voltage when a capacitance variation caused by a touch event occurs; and an integration unit integrating the corresponding voltage generated by the first voltage storing unit to generate a first output signal during a first period, and integrating the corresponding voltage generated by the second voltage storing unit to generate a second output signal during a second period, wherein the first and second voltage storing units each comprises; a first capacitor having a first terminal coupled to an alternating current (AC) common voltage from a common electrode, and a second terminal coupled to a first node; a first switching element having a first terminal coupled to the second terminal of the first capacitor and a second terminal coupled to the AC common voltage; and a second switching element having a first terminal coupled to the second terminal of the first capacitor, wherein the integration unit comprises; a third switching element having a first terminal coupled to the second terminal of the second switching element, and a second terminal; a second capacitor having a first terminal coupled to the second terminal of the third switching element, and a second terminal; a fourth switching element having a first terminal coupled to the second terminal of the third switching element, and a second terminal coupled to a low voltage level; a fifth switching element having a first terminal coupled to the second terminal of the second capacitor, and a second terminal; a sixth switching element having a first terminal coupled to the second terminal of the second capacitor, and a second terminal coupled to the low voltage level; an operational amplifier having an inversion input terminal coupled to the second terminal of the second capacitor, a non-inversion input terminal coupled to the low voltage level, and an output terminal; a third capacitor coupled between the inversion input terminal and the output terminal of the operational amplifier; a seventh switching element coupled between the inversion input terminal and the output terminal of the operational amplifier; and an eighth switching element coupled to the output terminal of the operational amplifier to output the first and second output signals. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification