Input Sensor Electrode Layout for EMI-Resistant Display Panels
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Solution Overview
Problem
Existing display devices face challenges in efficiently detecting user inputs, particularly from stylus pens and body parts, due to interference from electromagnetic waves and the need for improved input sensors that enhance detection accuracy and flexibility.
Innovation Solution
The display device incorporates a charge electrode and sensing electrode system, including a charge electrode beneath resin layers and a sensing electrode with specific materials and configurations, to detect electromagnetically induced currents from stylus pens and body inputs, while minimizing interference and maintaining device flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a charge electrode is disposed below resin layers to detect electromagnetic signals, then input detection accuracy is improved, but electromagnetic interference from external sources increases
Solution Approach 1:
A shielding layer is introduced as an intermediary component between the charge electrode and external electromagnetic sources. This shielding layer acts as a mediator that blocks harmful electromagnetic waves from reaching the sensing electrode, while allowing the electromagnetic signals from stylus pens or body parts to pass through to the charge electrode for detection.
Solution Approach 2:
The patent utilizes electromagnetic induction to convert the electromagnetic signals (which could be considered harmful interference) from stylus pens or body parts into useful detection signals. The charge electrode detects the electromagnetically induced current generated by these inputs, transforming potential interference into the basis for accurate input detection.
2Adaptability or versatility
If the base layer includes multiple resin layers with charge electrodes, then flexibility and durability are improved, but device complexity increases
Solution Approach 1:
The base layer is segmented into multiple resin layers (first resin layer, second resin layer, third resin layer) with charge electrodes positioned at different locations. This segmentation allows each layer to perform specific functions while collectively providing flexibility, durability, and electromagnetic signal detection capability.
Solution Approach 2:
The multi-layer resin structure serves multiple functions simultaneously: it provides mechanical flexibility, structural durability, electrical insulation, and electromagnetic signal detection. The charge electrodes integrated within these layers enable both touch input detection and stylus pen detection without requiring separate systems.
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 solution enhances input detection accuracy and flexibility by reducing electromagnetic interference, allowing for precise input recognition and maintaining device performance across various folding and operational modes.
Implementation Method 1
a sensing electrode detecting an electromagnetically induced current
Implementation Method 2
The charge electrode may define a current path that receives a constant voltage and generates a magnetic field therefrom
Data Source
AI summary
A display device includes a display panel including a display region and a non-display region proximate to the display region. An input sensor is disposed on the display panel and includes a sensing electrode configured to detect an electromagnetically induced current. The display panel includes a base layer including a plurality of resin layers, a plurality of pixels disposed on the base layer and overlapping the display region, and a charge electrode disposed below at least one of the plurality of resin layers and overlapping the display region.