Non-linear Boundary Design for Touch Sensor Appearance
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Solution Overview
Problem
Display devices with touch detection functions suffer from a poor appearance due to visible boundaries between detection and non-detection areas, caused by the reflection of light on linearly arranged detection electrodes.
Innovation Solution
The boundaries between detection and non-detection areas are designed with a non-linear shape, such as a rectangular or triangular wave pattern, using transparent conductive materials like ITO for the detection and dummy electrodes, which reduces light reflection and makes these boundaries less visible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If detection electrodes are arranged linearly in a matrix, then touch detection function is achieved, but boundaries between detection and non-detection areas become visible due to light reflection
Solution Approach 1:
The boundary between detection and non-detection areas is designed with a curved shape instead of a straight line. Specifically, the boundary includes a curved portion that arcs between adjacent detection electrodes, which reduces light reflection and makes the boundary less visible to observers, thereby improving appearance quality while maintaining the linear arrangement of detection electrodes for touch detection functionality.
2Shape
If non-linear boundary shape is used, then light reflection is reduced and appearance is improved, but manufacturing complexity increases
Solution Approach 1:
The non-linear boundary is segmented into multiple portions: a first boundary portion connecting adjacent detection electrodes and a second boundary portion extending from the first boundary portion. This segmentation allows the complex curved shape to be constructed from simpler geometric elements, making the design easier to manufacture while still achieving the goal of reducing light reflection and improving appearance quality.
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 design effectively suppresses the visual recognition of boundaries by observers, enhancing the appearance of the display device by minimizing light reflection and maintaining high occupancy ratios of conductive material, thus improving aesthetic quality.
Implementation Method 1
boundaries between detection and non-detection are visible to the observer by reflected light
Data Source
AI summary
According to one embodiment, a detection device includes a substrate and a plurality of sensor electrodes provided on the substrate, extending along a first direction and arranged to be spaced apart from each other along a second direction intersecting the first direction. The sensor electrodes form a plurality of detection areas extending in the first direction and a plurality of non-detection areas adjacent to the plurality of detection areas along the second direction, and a boundary between each of the detection areas and each respective one of the non-detection areas is not linear.