Touch Input Device Floating State Detection
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Solution Overview
Problem
Conventional touch input devices with Y-OCTA touch screen panels face issues in detecting touch signals accurately in a floating state, experiencing signal loss or splitting, leading to incorrect touch recognition and display flicker problems.
Innovation Solution
Incorporating a touch sensor with a plurality of driving electrodes, receiving electrodes, and dummy electrodes, where the touch detection unit subtracts noise signals from dummy electrodes to isolate actual touch signals, allowing for accurate detection even in a floating state and minimizing display noise and flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If driving electrodes and receiving electrodes are implemented in the same layer or dual layers in a Y-OCTA touch sensor, then the panel thickness is reduced and manufacturing is simplified, but signal detection accuracy deteriorates in floating state due to Low Ground Mass (LGM) effects causing signal disappearance or splitting
Solution Approach 1:
The touch sensor panel is divided into multiple independent layers: a first touch sensor layer containing driving electrodes, a second touch sensor layer containing receiving electrodes, and a dummy electrode layer. This segmentation allows each layer to perform its specific function independently, preventing LGM effects from causing signal splitting while maintaining the thin-profile benefits of the Y-OCTA structure.
Solution Approach 2:
A dummy electrode layer is introduced as an intermediary component between the driving and receiving electrodes. This dummy electrode layer absorbs or neutralizes the LGM effects that would otherwise cause signal disappearance or splitting, thereby improving touch signal detection accuracy in floating state without adding significant complexity to the overall panel structure.
2Ease of operation
If conventional touch sensor driving methods are used in floating state, then device operation is simple, but touch signal detection becomes inaccurate due to signal loss or splitting caused by Low Ground Mass (LGM)
Solution Approach 1:
The dummy electrode layer is pre-configured in the touch sensor structure before the device is operated. This preliminary arrangement ensures that when the device enters floating state, the LGM effects are already being managed by the dummy electrodes, preventing signal loss or splitting without requiring complex real-time adjustments to the driving method.
Solution Approach 2:
The dummy electrode layer serves as a mediator that handles the LGM effects, allowing the main driving and receiving electrodes to continue their normal operation without requiring complex control algorithms. This maintains ease of operation while improving reliability.
3Illumination intensity
If touch sensor driving voltage is reduced to minimize display flicker, then display quality improves, but touch signal detection sensitivity decreases
Solution Approach 1:
The touch sensor is segmented into multiple layers with dedicated functions. The dummy electrode layer specifically addresses LGM effects, allowing the driving and receiving electrodes to operate at lower voltages for reduced flicker while maintaining detection sensitivity through the enhanced signal path provided by the layered structure.
Solution Approach 2:
The dummy electrode layer acts as an intermediary that compensates for the reduced signal strength resulting from lower driving voltages. By managing LGM effects more effectively, it ensures that even weak touch signals can be detected accurately, maintaining sensitivity while allowing reduced driving voltage for flicker mitigation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables reliable detection of single and multi-touch inputs in a floating state, improves touch signal accuracy, and reduces display noise and flicker effects.
Implementation Method 1
a touch sensor which is disposed under the touch surface and includes a plurality of driving electrodes, a plurality of receiving electrodes, and a plurality of dummy receiving electrodes
Implementation Method 2
the touch detection unit detects the touch position of an object input to the touch surface by subtracting a second detection signal output from a dummy receiving electrode that does not form mutual capacitance with the predetermined driving electrode among the plurality of dummy receiving electrodes from a first detection signal output from a predetermined receiving electrode that forms mutual capacitance with the predetermined driving electrode among the plurality of receiving electrodes
Data Source
AI summary
The disclosed subject matter relates to a touch input device, and more particularly, to a touch input device including a touch sensor, which is capable of accurately detecting whether a touch input to a touch surface is input by an object or/and a touch position even in a situation where the touch input device is in a floating state. The touch input device includes a touch surface, including: a touch sensor which is disposed under the touch surface and includes a plurality of driving electrodes, a plurality of receiving electrodes, and a plurality of dummy receiving electrodes; and a touch detection unit configured to detect a touch position of an object input to the touch surface based on a detection signal output from the plurality of receiving electrodes of the touch sensor, in which the touch detection unit detects the touch position of the object input to the touch surface.