Gradient-Modulus Support Component for OLED Sensor Hole Stress
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Solution Overview
Problem
The production of flexible OLED displays with under-screen fingerprint identification technology faces issues such as defects like flash, burr, and fracture surfaces around the sensor hole, leading to stress concentration and imprint formation, which results in display defects like afterimages, dark lines, and uneven colors due to poor material continuity and flatness.
Innovation Solution
A supporting component with a hole and support portions, where the elasticity modulus of the second support portion is greater than the first, and the modulus decreases gradually from the outer edge to the hole, along with openings and recesses, is used to distribute stress and prevent imprint formation during bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fingerprint sensor hole is provided on the film layer to improve fingerprint identification sensitivity, then fingerprint identification sensitivity is improved, but stress concentration and imprint formation occur around the hole leading to display defects
Solution Approach 1:
The patent applies local quality by creating a gradient elasticity modulus structure in the supporting component, where the elasticity modulus varies spatially from the hole edge outward. This allows different regions of the supporting component to have different mechanical properties - softer near the hole to reduce stress concentration, and stiffer farther away to maintain structural integrity, thereby solving the imprint problem while preserving the fingerprint sensor hole functionality
Solution Approach 2:
The patent changes the physical parameter of elasticity modulus by dividing the supporting component into multiple regions with different elasticity modulus values. The first support portion has a lower elasticity modulus than the second support portion, creating a gradient structure that effectively distributes stress and prevents imprint formation around the fingerprint sensor hole
2Device complexity
If the supporting component structure is simplified to reduce manufacturing complexity, then manufacturing complexity is reduced, but stress distribution becomes uneven leading to imprint formation
Solution Approach 1:
The patent segments the supporting component into multiple distinct regions (first support portion and second support portion) with different elasticity moduli. This segmentation allows each region to perform its specific function - the first portion cushions stress near the hole while the second portion provides overall structural support, preventing imprint formation without excessive 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
This design effectively reduces stress concentration and prevents display defects by uniformly distributing compressive stress, improving the attachment of the display panel and reducing the risk of imprint-related issues during the lamination process.
Implementation Method 1
an elasticity modulus of the first support portion is smaller than an elasticity modulus of the second support portion
Implementation Method 2
in a direction from an outer edge of the first support portion to the hole, the elasticity modulus corresponding to the support regions gradually decreases
Data Source
AI summary
A supporting component and a display device are provided. The supporting component is configured to support the display panel. The supporting component includes a hole. The supporting component includes a first support portion and a second support portion. The first support portion is arranged around the hole. The second support portion is arranged around the first support portion. An elasticity modulus of the second support portion is greater than an elasticity modulus of the first support portion.