Touch Sensing Apparatus Peripheral Area Stylus Detection
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Solution Overview
Problem
Current touch screens only allow stylus interactions within the active area, limiting innovative interactions to the peripheral area.
Innovation Solution
A touch sensing apparatus with a touch panel and control circuit that includes nodes for detecting stylus inputs in both the active and peripheral areas, using capacitive sensing values to differentiate between input signals and display corresponding graphics, allowing stylus interactions beyond the active area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If nodes are only disposed in the active area of the substrate, then the touch sensing function is limited to the active area, but the interaction capabilities in the peripheral area are insufficient
Solution Approach 1:
The existing nodes in the active area are made to serve dual purposes: their original touch sensing function in the active area and a new touch sensing function for the peripheral area. When a stylus approaches the peripheral area, the capacitive coupling between the stylus and the nearby active area nodes enables peripheral area touch sensing without requiring dedicated peripheral nodes, thus achieving multi-functionality of existing components.
2Area of stationary object
If additional electrodes are added to enable peripheral area touch sensing, then the touch sensing function is extended to the peripheral area, but the device complexity increases
Solution Approach 1:
Existing active area nodes are made to serve dual purposes: their original touch sensing function in the active area and a new touch sensing function for the peripheral area. When a stylus approaches the peripheral area, the capacitive coupling between the stylus and the nearby active area nodes enables peripheral area touch sensing without requiring dedicated peripheral nodes, thus achieving multi-functionality of existing components.
Solution Approach 2:
The control circuit distinguishes between active area and peripheral area inputs by analyzing the capacitive sensing values and their patterns. By changing the interpretation parameters (capacitive value thresholds, signal patterns) rather than adding hardware, the system extends functionality while maintaining simple structure.
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 stylus pen touch sensing functions in both the active and peripheral areas without the need for additional electrodes, enhancing interaction capabilities.
Implementation Method 1
a first capacitive sensing value of a first node at an edge of the active area falls in a first threshold range, the control circuit determines that the input signal of the stylus pen is a peripheral area input signal
Data Source
AI summary
A touch sensing apparatus configured to receive an input signal of a stylus pen is provided. The touch sensing apparatus includes a display panel, a touch panel and a control circuit. The touch panel includes a substrate, a touch sensing element and a decorative element. The touch sensing element has a plurality of nodes for detecting the input signal. The control circuit is coupled to the display panel and the touch panel to activate a plurality of functions of the touch sensing apparatus through a plurality of determination steps, e.g., whether a capacitive sensing value of the node falls in a first threshold range, larger than a second threshold or larger than a third threshold, and whether the stylus pen touches the touch panel.