Foldable Display Digitizer Layering for EMR Sensing and Buckling
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Solution Overview
Problem
Current display devices face challenges in efficiently sensing inputs from electromagnetic pens, particularly in foldable designs where the thickness and structural integrity of digitizers can affect performance and reliability.
Innovation Solution
A display device configuration with a digitizer structure that includes multiple conductive and insulating layers, where the second conductive layer has a greater number of sub-layers and includes an intermediate base film, and the first conductive layer is thicker, allowing for efficient electromagnetic resonance sensing while minimizing visible lines and reducing the risk of buckling during folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the digitizer uses a thicker first conductive layer, then the sensing capability for electromagnetic pens is improved, but the risk of buckling during folding increases
Solution Approach 1:
The first conductive layer is divided into multiple sub-layers (first sub-conductive layer, second sub-conductive layer, third sub-conductive layer) with different thicknesses. The first sub-conductive layer has greater thickness for enhanced sensing capability, while the second and third sub-conductive layers have smaller thicknesses to reduce overall rigidity and minimize buckling risk during folding operations.
Solution Approach 2:
Different regions of the conductive layer structure have different thicknesses tailored to specific functional requirements. The first sub-conductive layer uses greater thickness for optimal electromagnetic sensing performance, while subsequent sub-layers use reduced thickness to balance structural flexibility and prevent buckling during device folding.
2Measurement precision
If the digitizer includes multiple sub-layers in the second conductive layer, then the electromagnetic resonance sensing is enhanced, but the structural complexity increases
Solution Approach 1:
The second conductive layer is segmented into multiple sub-layers (first sub-conductive layer, second sub-conductive layer, third sub-conductive layer) that can be independently optimized for electromagnetic resonance sensing performance while maintaining a systematic structure that manages complexity through modular design.
Solution Approach 2:
The digitizer employs a composite multi-layer structure combining different conductive and insulating materials. The second conductive layer integrates multiple sub-layers with potentially different material compositions to enhance electromagnetic resonance sensing capabilities while the overall composite structure provides mechanical stability.
3Ease of manufacture
If the digitizer uses a flat upper surface, then the manufacturing process is simplified, but the lower surface becomes uneven requiring additional processing
Solution Approach 1:
Instead of making the upper surface uneven and planarizing it, the patent inverts the approach by making the upper surface inherently flat through the stacking configuration of layers, while allowing the lower surface to be uneven. This reverses the conventional approach and simplifies manufacturing by eliminating the need for upper surface planarization processes.
Solution Approach 2:
The patent addresses surface uniformity issues by transitioning from a two-dimensional planarization approach to a three-dimensional layer stacking configuration. By carefully designing the vertical arrangement and thickness of base film, conductive layers, and insulating layers, the upper surface achieves flatness while the lower surface can accommodate unevenness without affecting overall device performance.
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
Enhances the ability to sense inputs from electromagnetic pens while maintaining structural integrity and reducing the risk of buckling, improving the reliability and folding performance of foldable display devices.
Implementation Method 1
The digitizer may be applied to the display devices in various forms by a method such as an electromagnetic resonance (EMR) method
Data Source
AI summary
A display device includes a window containing a glass substrate, a display panel disposed under the window, and a digitizer disposed under the display panel, wherein the digitizer includes a base film disposed under the display panel, a first conductive layer disposed under the base film, a first insulating layer disposed under the first conductive layer, a second conductive layer disposed under the first insulating layer, a second conductive layer disposed under the second conductive layer, and the second insulating layer disposed under the second conductive layer, and the window, the display panel, and the digitizer may be capable of being folded and unfolded.