Touch Sensing Unit Compensation Patterns for Non-Rectangular Displays
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Solution Overview
Problem
In display devices with non-rectangular shapes, such as circular or elliptical designs, the varying areas of sensing electrodes can lead to false touch recognition due to differences in touch sensing signals, as the electrodes at the edges may have smaller areas compared to those at the center, resulting in reduced touch sensitivity.
Innovation Solution
The touch sensing unit incorporates compensation patterns and signal wires arranged in the peripheral areas to equalize the capacitance between inner and outer electrodes, ensuring uniform touch sensitivity by connecting compensation patterns to the outer electrodes and signal wires, which overlap the light blocking member to prevent visual recognition and enhance touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the display device has a non-rectangular shape (circular, elliptical, or atypical planar shape), then the display device can achieve diversified planar shapes and unique design, but the sensing electrodes at the edge parts have smaller areas compared to inner electrodes, resulting in different touch sensing signals and false touch recognition
Solution Approach 1:
The patent applies local quality by introducing compensation patterns specifically at the edge parts of the display device where sensing electrode area is reduced. These compensation patterns are selectively added only in regions where the outer patterns have smaller areas, thereby locally adjusting the capacitance distribution to achieve uniform touch sensitivity across the entire display surface while maintaining the non-rectangular overall shape.
Solution Approach 2:
The patent changes the geometric parameters of the sensing electrodes by adding compensation patterns that extend along the edge parts. This increases the effective area of outer sensing electrodes to match the area of inner sensing electrodes, thereby equalizing the capacitance values and touch sensing signals across different regions of the display device.
2Measurement precision
If compensation patterns are added to increase the area of outer sensing electrodes, then touch sensitivity uniformity is improved, but the device complexity increases due to additional patterns and connection structures
Solution Approach 1:
The patent merges the compensation pattern with the existing outer pattern structure. The compensation pattern is integrated into the same conductive layer and is electrically connected to the outer pattern through a shared signal wire structure. This merging approach reduces device complexity by avoiding separate independent structures and utilizing existing layout resources.
Solution Approach 2:
The compensation pattern serves multiple functions: it compensates for the reduced area of outer sensing electrodes, maintains uniform capacitance distribution, and can be integrated with the existing signal wire system. The first compensation connection part protruding toward the first outer pattern and connected to it demonstrates multi-functional integration where a single structure performs both connection and compensation.
3Measurement precision
If signal wires are disposed in the touch peripheral area to connect compensation patterns, then the capacitance between inner and outer electrodes is equalized, but the visual appearance may be affected and light blocking is required
Solution Approach 1:
The patent converts the harmful visual effect of visible signal wires and compensation patterns into a beneficial feature by using light blocking members. The light blocking members are strategically positioned to overlap with the signal wires and compensation patterns in the touch peripheral area, thereby hiding these functional elements from view while preserving their electrical function. This transforms the visual defect into an aesthetic improvement.
Solution Approach 2:
The light blocking member acts as an intermediary element that mediates between the functional requirement (signal wire and compensation pattern visibility) and the aesthetic requirement (visual appearance). It allows the signal wires to perform their electrical function while preventing them from being visually perceived, thus resolving the contradiction between functionality and appearance.
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
This configuration increases the touch sensitivity uniformly across the display device, preventing false touch recognition and maintaining sensitivity even in non-rectangular shapes by compensating for the area differences between inner and outer electrodes, thus ensuring accurate touch input detection.
Implementation Method 1
The varying areas of sensing electrodes can lead to false touch recognition due to differences in touch sensing signals
Data Source
AI summary
A touch sensing unit includes a first electrode including a plurality of first main patterns arranged in a first direction and a first outer pattern arranged on one sides of the plurality of first main patterns, a second electrode including a plurality of second main patterns arranged in a second direction intersecting the first direction and a second outer pattern arranged on one sides of the plurality of second main patterns, a first compensation pattern extending along an edge of the first outer pattern, and a first signal wire connected to at least one of the first outer pattern and the first compensation pattern. The first compensation pattern includes a first compensation connection part protruding toward the first outer pattern and connected to the first outer pattern.