Foldable Display Digitizer Layering for Flat Folding Regions
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Solution Overview
Problem
Existing flexible display devices face challenges in maintaining surface quality and reliability, particularly in the folding regions where digitizers are integrated, leading to potential performance issues and reduced durability.
Innovation Solution
The display device incorporates a digitizer with a specific configuration, including first and second sensing coils, compensating layers, and bridge lines, designed to enhance surface flatness and symmetry, thereby improving reliability and performance in folding regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a digitizer is integrated into the folding region of a flexible display device, then the device enables electromagnetic sensing functionality, but the surface quality and reliability deteriorate in the folding region
Solution Approach 1:
The digitizer is divided into multiple sensing coils (first sensing coil, second sensing coil, third sensing coil) with different orientations. Each sensing coil is independently configured to detect electromagnetic changes from the stylus, allowing the digitizer to maintain sensing functionality across the folding region while distributing the structural stress across multiple discrete elements rather than a continuous structure.
Solution Approach 2:
The patent applies different compensating layers (first compensating layer, second compensating layer, third compensating layer) at different locations within the folding region. Each compensating layer is positioned to address local surface irregularities and stress concentrations specific to its region, thereby maintaining overall surface quality and reliability while preserving the integrated electromagnetic sensing capability.
2Manufacturing precision
If compensating layers are added to the digitizer structure, then surface flatness is improved, but device complexity increases
Solution Approach 1:
The compensating layers are implemented as thin film structures that conform to the underlying digitizer components. These flexible thin films provide surface flatness compensation without adding significant structural complexity or rigidity, allowing the multi-layer compensating structure to be integrated into the existing digitizer architecture with minimal increase in overall device complexity.
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 the surface quality and reliability of flexible display devices by ensuring consistent performance and durability in folding states, addressing the limitations of existing technologies.
Implementation Method 1
The digitizer may sense an electromagnetic change made through the access of a pen placed on the display device and may detect the position of the pen
Data Source
AI summary
A display device includes a display panel including a first non-folding region, a second non-folding region, and a folding region interposed between the first non-folding region and the second non-folding region, and a digitizer disposed under the display panel and divided into an active region and a non-active region surrounding the active region. The digitizer includes a first sensing coil disposed in the active region, a first compensating layer disposed on the first sensing coil to cover the first sensing coil, a second sensing coil disposed under the first sensing coil in the active region, a bridge line disposed under the second sensing coil, and a second compensating layer disposed under the bridge line to cover the bridge line. A surface of the first compensating layer, which is opposite to a surface of the first compensating layer covering the first sensing coil, is flat.