Lighting Touchpad Electrode Layout to Prevent LED Touch Interference
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Solution Overview
Problem
Conventional lighting touchpads face issues with touch control effects being affected by the arrangement of LED dies, leading to potential interference and suboptimal optical performance.
Innovation Solution
A lighting touchpad design that includes a substrate module with sensing and driving electrodes, LED dies, and a protective layer, where the LED dies are positioned to avoid shielding the sensing electrodes, allowing for independent control and reducing thickness through strategic placement and distribution of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LED dies are arranged on lateral portions of the touchpad, then light emission function is achieved, but touch control effect is degraded due to interference from LED arrangement
Solution Approach 1:
The patent divides the touchpad into distinct functional regions: a first region for sensing electrodes and a second region for LED dies. This spatial segmentation separates the touch sensing function from the light emission function, preventing interference between the two while maintaining both functionalities independently.
Solution Approach 2:
The patent applies different functional qualities to different regions of the touchpad. The first region is optimized for touch sensing with sensing electrodes, while the second region is optimized for light emission with LED dies. This local differentiation ensures that each region performs its specific function without being degraded by the other.
2Device complexity
If multiple components (sensing electrodes, driving electrodes, LED dies) are integrated on the same substrate, then device complexity is reduced, but component interference increases
Solution Approach 1:
The patent segments the substrate into distinct regions for different components. The first region contains sensing electrodes and the second region contains LED dies, with clear spatial separation. This segmentation reduces interference between components while maintaining integration on a single substrate, balancing complexity reduction with interference mitigation.
3Length of stationary object
If LED dies are positioned close to the protective layer, then overall thickness is reduced, but optical performance is degraded due to shielding effects
Solution Approach 1:
The patent positions LED dies in a second region that is laterally separated from the sensing electrode region rather than vertically stacking them. This lateral dimensionality change allows the LED dies to be positioned without shielding the sensing electrodes, maintaining optical performance while achieving a compact overall 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
The design enhances touch control accuracy by minimizing LED die interference and enables subtle optical performance adjustments, while potentially reducing the overall thickness of the touchpad.
Implementation Method 1
a plurality of light emitting diode (LED) dies mounted on the substrate module
Implementation Method 2
a sensing electrode layer including a plurality of sensing electrodes formed on the substrate module
Data Source
AI summary
A lighting touchpad is provided, which includes a substrate module, a sensing electrode layer formed on the substrate module, a driving electrode layer including a plurality of driving electrodes formed on the substrate module, a plurality of light emitting diode (LED) dies, a protective layer, and a controller. The protective layer covers the sensing electrodes, the driving electrodes, and the LED dies. The controller is electrically coupled to the sensing electrode layer, the driving electrode layer, and the LED dies through the substrate module. The substrate module includes a first substrate having two opposite surfaces. The driving electrode layer is formed on one of the two opposite surfaces of the first substrate, and the LED dies are mounted on another one of the two opposite surfaces of the first substrate and are closer to the protective layer.