Integrated Display Sensing Loops for Electromagnetic Pen Input
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Solution Overview
Problem
Current display devices that sense inputs through electromagnetic pens often require additional thickness for separate digitizers, limiting their flexibility and thickness reduction, especially in foldable designs.
Innovation Solution
Incorporating a functional layer with coils and sensing loops within the display panel, which includes a base layer, circuit layer, and display element layer, allowing for integrated sensing capabilities without the need for a separate digitizer, thereby reducing thickness and enhancing flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate digitizer is added to sense electromagnetic pen input, then sensing capability is improved, but device thickness increases
Solution Approach 1:
The patent combines the digitizer components (coils and sensing loops) with the display panel structure. The coils are formed on the same substrate as the display elements, and the sensing loops are integrated into the display panel layers, allowing the display and sensing functions to share common structural elements rather than requiring separate stacked components.
Solution Approach 2:
The display panel structure is designed to serve multiple functions: it acts as both the display medium and the sensing substrate. The same transparent conductive layers and structural components that form the display also serve as the sensing electrodes and support structure for the electromagnetic pen detection, eliminating the need for dedicated separate digitizer components.
2Reliability
If a separate digitizer is added to sense electromagnetic pen input, then sensing capability is improved, but device flexibility is reduced
Solution Approach 1:
The digitizer components are merged with the display panel structure, sharing common flexible substrates and support layers. This integration allows the entire assembly to bend and flex together as a unified structure, maintaining flexibility while providing sensing capability.
3Length of stationary object
If coils and sensing loops are integrated within the display panel, then device thickness is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent divides the display panel into distinct functional layers (transparent conductive layers, insulation layers, coil patterns, sensing loops) that can be manufactured separately and then assembled. This layer-by-layer construction approach allows each component to be optimized and manufactured using standard processes before being integrated into the final display 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
This integration enables a thinner, more flexible display device capable of sensing inputs from electromagnetic pens, maintaining or improving performance while allowing for foldable designs without the bulk of additional digitizers.
Implementation Method 1
a coil to which an AC signal is applied
Implementation Method 2
a digitizer that senses a touch by an electromagnetic pen. The digitizer may be applied to the display device in various manners such as an electromagnetic resonance (EMR) manner
Data Source
AI summary
Provided is a display device. The display device comprises a functional layer in which a plurality of pixel areas are defined and which includes at least one coil to which an AC signal is applied and an input sensor configured to sense an input from an external source and disposed on the functional layer. The input sensor comprises a first conductive layer including a first sensing loop extending in a first direction, a sensing insulation layer disposed on the first conductive layer, and a second conductive layer disposed on the sensing insulation layer and including a second sensing loop extending in a second direction crossing the first direction.