CAPACITIVE TOUCH SCREEN
First Claim
1. A capacitive touch screen, comprising a touch substrate and a touch system circuit, wherein the touch system circuit has a touch excitation source and a touch signal detection unit, and sensing line groups are disposed on the touch substrate;
- when at least two groups of sensing lines are disposed on the touch substrate, each group of sensing lines are disposed on different touch substrates or disposed on the same touch substrate while being isolated with an insulating layer;
the touch substrate is disposed on a product where the capacitive touch screen is applied, and the application product has a display system (comprising a display screen and a driving circuit thereof, and a backlight source and a driving circuit thereof);
a first output end of the touch excitation source is used for applying touch signals to the connected electrode lines for at least some moments in a detection period;
the touch signal detection unit is used for selecting at least a part of the electrode lines as touch detection electrodes for at least some moments in the detection period, so as to detect whether the part of the electrode lines are touched or not; and
the touch detection electrodes are electrodes capable of detecting changes of the touch signals flowing there-through when applied with the touch signals, whereinthe touch system circuit also selects a part of the electrode lines on the touch substrate as touch return-loop electrodes when selecting the part of the electrodes as the detecting lines; and
the touch return-loop electrodes are sensing lines, when the touch signals are applied to the touch detection electrodes and the changes of the touch signals flowing there-through are detected, in communication with a second output end of the touch excitation source or another touch excitation source for providing return-loop paths for the touch signals on the detecting lines.
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Accused Products
Abstract
A capacitive touch screen is provided. Return-loop electrodes of touch signals are established on the capacitive touch screen or a product where the capacitive touch screen is applied, and touch detection electrodes for detecting changes of the touch signals and the touch return-loop electrodes are respectively connected to different output ends of a touch excitation source, so that a closed touch loop is formed by the touch excitation source, the touch detection electrodes, the touch return-loop electrodes, and coupling capacitances between the touch detection electrodes and the touch return-loop electrodes, and the touch signals flowing into the touch detection electrodes from the touch excitation source again flows back to the touch excitation source from the touch return-loop electrodes. Then, the touch system is isolated from other systems. Touch information is acquired by detecting the change of the current in the touch signals having specific frequencies or other specific characteristics.
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Citations
21 Claims
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1. A capacitive touch screen, comprising a touch substrate and a touch system circuit, wherein the touch system circuit has a touch excitation source and a touch signal detection unit, and sensing line groups are disposed on the touch substrate;
- when at least two groups of sensing lines are disposed on the touch substrate, each group of sensing lines are disposed on different touch substrates or disposed on the same touch substrate while being isolated with an insulating layer;
the touch substrate is disposed on a product where the capacitive touch screen is applied, and the application product has a display system (comprising a display screen and a driving circuit thereof, and a backlight source and a driving circuit thereof);
a first output end of the touch excitation source is used for applying touch signals to the connected electrode lines for at least some moments in a detection period;
the touch signal detection unit is used for selecting at least a part of the electrode lines as touch detection electrodes for at least some moments in the detection period, so as to detect whether the part of the electrode lines are touched or not; and
the touch detection electrodes are electrodes capable of detecting changes of the touch signals flowing there-through when applied with the touch signals, whereinthe touch system circuit also selects a part of the electrode lines on the touch substrate as touch return-loop electrodes when selecting the part of the electrodes as the detecting lines; and
the touch return-loop electrodes are sensing lines, when the touch signals are applied to the touch detection electrodes and the changes of the touch signals flowing there-through are detected, in communication with a second output end of the touch excitation source or another touch excitation source for providing return-loop paths for the touch signals on the detecting lines. - View Dependent Claims (2, 3, 5, 7, 9, 11, 14, 16, 18, 20)
- when at least two groups of sensing lines are disposed on the touch substrate, each group of sensing lines are disposed on different touch substrates or disposed on the same touch substrate while being isolated with an insulating layer;
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4. A capacitive touch screen, comprising a touch substrate and a touch system circuit, wherein the touch system circuit has a touch excitation source and a touch signal detection unit, and sensing line groups are disposed on the touch substrate;
- when at least two groups of sensing lines are disposed on the touch substrate, each group of sensing lines are disposed on different touch substrates or disposed on the same touch substrate while being isolated with an insulating layer;
the touch substrate is disposed on a product where the capacitive touch screen is applied, and the application product has a display system (comprising a display screen and a driving circuit thereof, and a backlight source and a driving circuit thereof);
a first output end of the touch excitation source is used for applying touch signals to the connected electrode lines for at least some moments in a detection period;
the touch signal detection unit is used for selecting at least a part of the electrode lines as touch detection electrodes for at least some moments in the detection period, so as to detect whether the part of the electrode lines are touched or not; and
the touch detection electrodes are electrodes capable of detecting changes of the touch signals flowing there-through when applied with the touch signals, whereinelectrodes are disposed on a housing of the application product;
the touch system circuit selects the electrodes disposed on the housing of the application product as touch return-loop electrodes; and
the touch return-loop electrodes are sensing lines, when the touch signals are applied to the touch detection electrodes and the changes of the touch signals flowing there-through are detected, in communication with a second output end of the touch excitation source or another touch excitation source for providing return-loop paths for the touch signals on the detecting lines. - View Dependent Claims (6, 8, 10, 12, 13, 15, 17, 19, 21)
- when at least two groups of sensing lines are disposed on the touch substrate, each group of sensing lines are disposed on different touch substrates or disposed on the same touch substrate while being isolated with an insulating layer;
Specification