Flexible Display Rippled Surface Light Extraction
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Solution Overview
Problem
Conventional flexible display apparatuses suffer from decreased light extracting efficiency due to light being confined within the display unit, which limits their performance.
Innovation Solution
A flexible display apparatus with a rippled surface flexible substrate and pixel electrode, along with an intermediate layer including a light emission layer, is manufactured by applying a tensile force to form irregularly spaced ripples, enhancing light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional flat flexible substrate is used, then the manufacturing process is simple, but light extracting efficiency is decreased due to light being confined in the display apparatus
Solution Approach 1:
The patent applies curvature by forming a rippled surface on the flexible substrate and pixel electrode using a tensile force application method. The substrate is stretched during manufacturing and then relaxed, creating permanent ripples that increase light extraction efficiency without complicating the manufacturing process
Solution Approach 2:
The patent changes the surface geometry parameter of the flexible substrate from flat to rippled. By controlling the tensile force magnitude and duration, the ripple characteristics (amplitude, wavelength, distribution) are optimized to maximize light extraction while maintaining manufacturing feasibility
2Loss of energy
If a rippled surface is formed on the flexible substrate and pixel electrode, then light extracting efficiency is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent employs self-service by utilizing the inherent elastic properties of the flexible substrate material. The substrate itself generates the ripple structure through controlled tensile and release cycles, eliminating the need for separate patterning tools or chemical etching processes that would increase manufacturing complexity
Solution Approach 2:
The patent replaces complex mechanical patterning systems (such as photolithography, etching, or embossing equipment) with a simple tensile force application and release mechanism. This mechanical substitution dramatically simplifies the manufacturing process while achieving the desired ripple structure for enhanced light extraction
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 rippled surface design significantly increases light extracting efficiency by mechanically forming wrinkles or ripples in the flexible substrate and pixel electrode, improving the display's performance without the need for additional patterning or chemical processes.
Implementation Method 1
a flexible substrate having a rippled surface, a pixel electrode on the flexible substrate and having a rippled surface... applying a tensile force to a flexible substrate, forming a pixel electrode on the flexible substrate, removing the tensile force applied to the flexible substrate to form a rippled surface in the pixel electrode
Data Source
AI summary
Provided is a flexible display apparatus having an improved light extracting efficiency and a method of manufacturing the flexible display apparatus. The flexible display apparatus includes a flexible substrate having a rippled surface, a pixel electrode on the flexible substrate and having a rippled surface, an intermediate layer on the pixel electrode and including a light emission layer, and an opposing electrode facing the pixel electrode. A method of manufacturing the flexible display apparatus includes applying a tensile force to a flexible substrate, forming a pixel electrode on the flexible substrate, removing the tensile force applied to the flexible substrate to form a rippled surface in the pixel electrode, forming an intermediate layer including an light emission layer on the pixel electrode, and forming an opposing electrode facing the pixel electrode.