Input Device Proximity Detection Using Third Electrode Unit
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Solution Overview
Problem
Existing input devices and display devices face challenges in detecting external proximity objects with high accuracy and reducing thickness while maintaining effective capacitance-based detection functionality.
Innovation Solution
The solution involves a configuration with a first substrate, a light-emitting element unit, and a third electrode unit, where the light-emitting element unit includes conductive layers and luminescent layers electrically connected, and the third electrode unit detects changes in the electric field based on the proximity object's coordinates, enabling accurate proximity detection while allowing for a thinner device structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a light-transmissible substrate is shared between the touch panel and front light to reduce thickness, then device thickness is reduced, but proximity detection accuracy deteriorates due to interference between lighting and detection functions
Solution Approach 1:
The patent divides the device into separate functional layers: a touch panel unit with proximity detection electrodes and a front light unit with light-emitting elements. This segmentation allows each unit to perform its specific function independently, with the proximity detection unit accurately detecting external objects without interference from the lighting unit, while still achieving reduced overall thickness through the shared light-transmissible substrate.
2Adaptability or versatility
If capacitance-based proximity detection is implemented, then proximity detection functionality is achieved, but device complexity increases due to additional electrode structures and signal processing requirements
Solution Approach 1:
The patent implements multi-functionality by using the same light-transmissible substrate for both proximity detection and front lighting purposes. The proximity detection electrodes are integrated into the touch panel structure, allowing the device to perform proximity detection, touch input, and front lighting functions through a unified design, thereby reducing overall device complexity while maintaining detection accuracy.
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 accuracy of proximity detection and allows for a reduction in device thickness, addressing the need for more precise and compact input and display devices.
Implementation Method 1
the third electrode unit is insulated from the first conductive layers and detects a change in an electric field between the first conductive layers and the third electrode unit depending on coordinates of a proximity object
Implementation Method 2
detects a change in an electric field between the first conductive layers and the third electrode unit
Data Source
AI summary
An input device includes a first substrate, a light-emitting element, and a third electrode unit. The first substrate has first and second surfaces. The light-emitting element unit includes: a first conductive electrode unit including first conductive layers; a second conductive electrode unit including second conductive layers each having a size overlapping with the first conductive layer in planar view; and luminescent layers conducted with at least a part of the first electrode unit, each provided between the first and second electrode units and conducted with the first conductive layer and the second conductive layer overlapping with the first conductive layer in planar view. The third electrode unit is insulated from the first conductive layers and detects a change in an electric field between the first conductive layers and the third electrode unit depending on coordinates of a proximity object at a position overlapping with the first surface in planar view.