Input Sensor Electrode Layout for Stylus-Ready 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 limitations in input sensor technology, which affects the versatility and accuracy of input detection.
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, enhancing input detection accuracy and versatility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a charge electrode is disposed below resin layers to detect stylus pen inputs through electromagnetic induction, then detection accuracy for stylus pens is improved, but line resistance of the sensing electrode increases
Solution Approach 1:
The patent introduces a dual-layer resin structure with the charge electrode positioned between them, creating a three-dimensional configuration that optimizes both electromagnetic induction efficiency and electrical conductivity pathways, thereby resolving the contradiction between detection accuracy and line resistance
Solution Approach 2:
The patent employs composite material structures including conductive materials with specific resistivity ranges and multi-layer resin compositions that balance insulation properties with electrical conductivity, reducing line resistance while maintaining detection accuracy
2Adaptability or versatility
If the charge electrode is positioned to overlap with light emitting elements, then input detection versatility is improved, but display quality may be affected
Solution Approach 1:
The patent applies local quality by making the charge electrode transparent or semi-transparent in regions overlapping light emitting elements, allowing light to pass through while maintaining electromagnetic induction functionality, thus preserving display quality while enabling versatile input detection
Solution Approach 2:
The resin layers serve as intermediary materials between the charge electrode and light emitting elements, providing electrical insulation while allowing electromagnetic fields to pass through, enabling the charge electrode to detect inputs without directly interfering with light emission
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 system effectively detects inputs from both stylus pens and body parts, improving user interaction with display devices by enabling time division driving and reducing line resistance, thus enhancing user experience and functionality.
Implementation Method 1
a sensing electrode detecting an electromagnetically induced current
Implementation Method 2
The input sensor may detect inputs from a stylus pen through electromagnetic induction
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.