Lighting Touchpad Layer Configuration for Touch Sensing Accuracy
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Solution Overview
Problem
Conventional lighting touchpads face issues with touch control effects being affected by the arrangement of light emitting diode (LED) chips, which can interfere with the sensing electrodes.
Innovation Solution
The design includes a substrate module with sensing and driving electrode layers, where LED chips are arranged in a distribution space that does not shield the sensing electrodes, and a controller is electrically coupled to these components to drive the LEDs when a coupling capacity is detected, ensuring optimal touch control and optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LED chips are arranged on lateral portions of the touchpad for lighting function, then the lighting effect is improved, but the touch control effect is degraded due to interference with sensing electrodes
Solution Approach 1:
The patent transitions from a planar arrangement where LED chips are placed on lateral portions to a three-dimensional configuration where LED chips are positioned on the back surface of the touchpad substrate. This dimensional change allows the lighting function to be achieved without the LED chips occupying space that would interfere with the sensing electrodes on the front surface, thereby resolving the contradiction between lighting effect and touch control precision
Solution Approach 2:
The patent introduces a light guiding layer as an intermediary component between the LED chips on the back surface and the front surface of the touchpad. This light guiding layer directs the light from the LED chips through the substrate to provide uniform illumination without requiring the LED chips to be in direct contact with or near the sensing electrodes, thus maintaining both lighting effectiveness and touch control accuracy
2Length of stationary object
If LED chips are placed close to sensing electrodes for compact design, then device thickness is reduced, but touch sensing precision is degraded due to shielding effect
Solution Approach 1:
The patent positions LED chips on the back surface of the substrate rather than on the front surface near the sensing electrodes. This spatial separation in the vertical dimension allows the touchpad to maintain compact thickness while preventing the LED chips from shielding the sensing electrodes, as the light emission occurs from the opposite side of where touch sensing takes place
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 enhances the touch control effect by avoiding interference from LED chip positions and allows for subtle changes in optical performance, reducing the thickness of the touchpad and simplifying manufacturing.
Implementation Method 1
a plurality of light emitting diode (LED) chips (4), and a controller (6). The LED dies are mounted on the substrate module and are arranged in the distribution space
Implementation Method 2
When a coupling capacity is generated between a conductor and at least one of the sensing electrodes, the controller is configured to drive at least one of the LED dies adjacent to the at least one of the sensing electrodes to emit light
Data Source
AI summary
A lighting touchpad is provided, which includes a substrate module, a plurality of sensing electrodes, a plurality of driving electrodes, a plurality of light emitting diode (LED) chips mounted on the substrate module, and a controller. The driving electrodes and the sensing electrodes are formed on the substrate module. The driving electrodes define a distribution space that extends along a normal direction of the substrate module. The LED dies are arranged in the distribution space. The controller is electrically coupled to the sensing electrodes, the driving electrodes, and the LED dies through the substrate module. When a coupling capacity is generated between a conductor and at least one of the sensing electrodes, the controller is configured to drive at least one of the LED dies adjacent to the at least one of the sensing electrodes to emit light.