Film Touch Sensor Retardation Control for Flexible Display Color Stability
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Solution Overview
Problem
Flexible displays face issues with image quality and color sense changes due to optical characteristics of their multi-layer structure, leading to interference between laminates, especially noticeable in reflective color sense changes on front and inclined surfaces when viewed from different angles.
Innovation Solution
A film touch sensor is developed with a specific base film and adhesive layer configuration, including a retardation value range for the base film and curable adhesive compositions, to minimize interference and maintain image quality by reducing reflective color sense changes across viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-layer structure is used for flexible display, then flexibility and lightweight properties are improved, but interference between laminates occurs causing image quality deterioration and color sense changes
Solution Approach 1:
A separation layer is introduced as an intermediary between the base film and the adhesive layer. This separation layer has a refractive index (1.30-1.70) specifically optimized to reduce optical interference between laminates, thereby preventing image quality deterioration and color sense changes while maintaining the multi-layer flexible structure
Solution Approach 2:
The refractive index of the separation layer is precisely controlled within the range of 1.30-1.70, and its thickness is optimized to be 10-500 nm. These parameter changes are designed to minimize optical interference effects between layers, reducing reflective color sense changes and maintaining image quality in the flexible multi-layer display
2Adaptability or versatility
If multiple layers are laminated, then functional requirements are met, but reflective color sense changes on front and inclined surfaces increase
Solution Approach 1:
The separation layer acts as an optical intermediary with a specifically engineered refractive index (1.30-1.70) that reduces optical interference between the base film and adhesive layer. This mediation minimizes reflective color sense changes on both front and inclined surfaces across different viewing angles
Solution Approach 2:
The separation layer is applied locally at the interface between the base film and adhesive layer, providing targeted optical interference reduction exactly where needed. This localized intervention addresses the reflective color sense change problem without affecting other functional layers of the display
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 film touch sensor effectively reduces changes in black reflective color sense and reflective color sense on inclined surfaces, enhancing image visibility and stability when applied to flexible displays.
Implementation Method 1
the base film has a retardation value Ro in a plane direction of 0 to 10 nm, and a retardation value Rth in a thickness direction of −10 to 10 nm
Data Source
AI summary
A film touch sensor includes a base film, an adhesive layer, a separation layer and a conductive pattern layer, which are sequentially laminated. The base film has a retardation value Ro in a plane direction of 0 to 10 nm, and a retardation value Rth in a thickness direction of −10 to 10 nm. When the film touch sensor is applied to a final product, interference between laminates may be minimized to significantly reduce a change in color sense of an image.