Segmented Reflective Member for Touch Panel Capacitive Coupling
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Solution Overview
Problem
In display devices with touch panels, the presence of electrically conductive reflective members causes capacitive coupling between touch sensor electrodes, leading to increased CR time constants and decreased touch detection performance.
Innovation Solution
The electrically conductive reflective member is segmented into multiple portions, positioned closer to the backlight than the touch detection electrodes, to reduce capacitive coupling and maintain or improve touch detection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an electrically conductive reflective member is provided in the touch panel to improve light usage efficiency, then light reflection efficiency is improved, but capacitive coupling between touch sensor electrodes increases
Solution Approach 1:
The electrically conductive reflective member is divided into multiple segments arranged in a matrix pattern, with insulating spaces between adjacent segments. This segmentation reduces the continuous conductive area, thereby decreasing capacitive coupling between touch sensor electrodes while maintaining sufficient light reflection efficiency through the distributed reflective segments.
2Illumination intensity
If an electrically conductive reflective member is provided closer to the backlight than touch detection electrodes, then light reflection is improved, but CR time constant of touch detection electrodes increases
Solution Approach 1:
The reflective member is segmented into multiple discrete conductive regions separated by insulating spaces. This segmentation reduces the total conductive area and distributes the capacitive coupling effect, thereby reducing the CR time constant while maintaining effective light reflection through the arranged segments.
Solution Approach 2:
The reflective member has different properties in different regions: conductive regions for light reflection and insulating spaces for reducing capacitive coupling. This local differentiation allows the structure to simultaneously achieve good light reflection and minimize capacitive effects on touch detection.
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 reduces the CR time constant of the touch detection electrodes, thereby maintaining or enhancing touch detection performance even with an electrically conductive reflective member.
Implementation Method 1
configured to reflect light from the backlight
Implementation Method 2
the conductive reflective member and the touch sensor electrodes are subject to capacitive coupling
Data Source
AI summary
A display device includes a backlight, a touch detection electrode disposed to overlap a display region in which an image is displayed in a plan view, and an electrically conductive reflective member disposed closer to the backlight than a plurality of touch detection electrodes. Reflective members are disposed to overlap at least some of the plurality of touch detection electrodes in a plan view, are configured to reflect light from the backlight, and segmented from each other in a plan view.