Foldable Display Code Pattern Layer for Pen Sensing and Peel Resistance
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Solution Overview
Problem
Existing foldable display devices face challenges in accurately sensing touch inputs using electronic pens and are prone to peeling of the code pattern layer.
Innovation Solution
A display device design incorporating a code pattern layer with a light absorption layer, a base layer, and cholesteric crystal liquid crystals that reflect infrared light, along with a thickness optimization to prevent peeling, ensuring accurate touch input sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a code pattern layer is added to enable electronic pen touch input sensing, then touch input sensing precision is improved, but the code pattern layer peels off in foldable display devices
Solution Approach 1:
The code pattern layer is constructed as a composite structure with multiple functional layers including a base layer, light absorption layer, cholesteric liquid crystal layer, and UV blocking layer. This composite structure distributes mechanical stress and improves overall adhesion to the display panel, preventing peeling while maintaining touch sensing functionality.
Solution Approach 2:
The code pattern layer uses thin film structures that are flexible enough to accommodate the bending and folding of the display device. The thin film design reduces rigidity-induced stress concentration that would otherwise cause delamination during folding operations.
2Measurement precision
If the code pattern layer thickness is increased to improve infrared light reflection, then touch input detection accuracy is improved, but the code pattern layer becomes more prone to peeling
Solution Approach 1:
The patent optimizes the thickness parameters of each layer within specific ranges to achieve the desired infrared reflection performance. By carefully controlling thickness parameters, the design achieves sufficient optical functionality while maintaining mechanical flexibility and adhesion to prevent peeling.
Solution Approach 2:
Different layers of the code pattern structure have different thicknesses optimized for their specific functions. The light absorption layer and cholesteric liquid crystal layer have specific thickness ranges that provide adequate infrared reflection, while the overall structure remains thin enough to maintain flexibility and prevent peeling.
3Measurement precision
If multiple layers are added to the code pattern structure to improve infrared reflection, then touch input sensing precision is improved, but device complexity increases
Solution Approach 1:
Each layer of the code pattern structure serves multiple functions. For example, the base layer provides mechanical support and adhesion, while also serving as a substrate for the optical layers. The UV blocking layer protects underlying layers from UV degradation while maintaining optical transparency for the intended application. This multi-functionality reduces the need for additional dedicated layers.
Solution Approach 2:
The patent combines multiple functional requirements into a integrated multi-layer structure where layers work together to achieve both optical performance and mechanical stability. The merging of adhesion, optical reflection, and protective functions into a unified structure manages complexity while achieving the desired 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
The design enables precise touch input detection and prevents the code pattern layer from peeling off, enhancing the durability and functionality of foldable display devices.
Implementation Method 1
each of the plurality of code patterns reflects infrared light
Implementation Method 2
a crystal liquid layer disposed between the first alignment layer and the second alignment layer and including a cholesteric crystal liquid
Implementation Method 3
the light absorption layer absorbs infrared light
Implementation Method 4
a first adhesive layer disposed on one surface of the display panel
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, a folding area, a first non-folding area disposed on one side of the folding area, and a second non-folding area disposed on the other side of the folding area, a first adhesive layer disposed on one surface of the display panel, and a code pattern layer. The code pattern layer includes a light absorption layer disposed on one surface of the first adhesive layer, a base layer disposed on the light absorption layer, and a plurality of code patterns disposed on the base layer. A thickness of the base layer is smaller than a thickness of the first adhesive layer.