Transparent Conductive Polyester Film Prevents Fold Marks and Tears
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Solution Overview
Problem
Existing foldable displays suffer from image distortion, tears, and cracks due to repeated folding, and current materials like glass and polyimide films are either brittle or expensive, hindering lightweight and durable solutions.
Innovation Solution
A transparent conductive polyester film with specific refractive indices and density, combined with a conductive layer, that provides flexibility and durability, preventing tears and image distortion even with repeated folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass is used in the display screen, then hardness is improved, but breakage resistance deteriorates when folded
Solution Approach 1:
The patent replaces rigid glass with flexible polyester films that can be repeatedly folded without breaking. The polyester film substrate provides both flexibility for folding and sufficient strength through its material properties, eliminating the need for rigid glass while maintaining durability.
Solution Approach 2:
The patent uses composite material structures combining polyester film substrate with transparent conductive layers and protective coatings. This composite structure provides both flexibility for folding and the necessary mechanical strength and hardness through the combination of different materials.
2Weight of moving object
If glass is thinned to achieve lightweighting, then weight is reduced, but strength is reduced making it liable to breakage
Solution Approach 1:
The patent uses thin polyester films that are inherently lightweight and can be made extremely thin without compromising strength, replacing thick glass that must be thinned for lightweighting. The polyester film provides sufficient strength at thin thicknesses due to its material properties.
Solution Approach 2:
The patent employs composite material structures where thin polyester film is combined with reinforcing layers and protective coatings, achieving both lightweighting and sufficient strength through the composite structure rather than relying on a single thick material.
3Adaptability or versatility
If optical film has bendability, then folding performance is improved, but tear resistance deteriorates
Solution Approach 1:
The patent uses flexible polyester films that are specifically designed to provide both bendability for folding and tear resistance through their material properties and structural configuration, allowing the film to withstand repeated folding without tearing.
Solution Approach 2:
The patent employs composite material structures combining flexible polyester substrate with reinforcing layers and protective coatings that provide both bendability and tear resistance, where each layer contributes specific properties to the overall structure.
4Strength
If polyimide film or aramid film is used as resin substrate, then bending resistance is improved, but cost increases significantly
Solution Approach 1:
The patent uses cost-effective polyester films instead of expensive polyimide or aramid films, achieving sufficient bending resistance through the polyester film's inherent properties and structural design rather than relying on expensive materials.
Solution Approach 2:
The patent modifies the polyester film's properties through controlled manufacturing parameters and structural configuration to achieve the required bending resistance, rather than changing the base material to an expensive alternative.
5Strength
If two substrate units with hard coating layers are laminated, then bending resistance is improved, but total thickness increases hindering lightweighting
Solution Approach 1:
The patent uses thin flexible polyester films with integrated protective coatings that provide sufficient bending resistance without requiring multiple thick substrate units, maintaining thin overall thickness for lightweighting while achieving necessary durability.
Solution Approach 2:
The patent employs optimized composite material structures where thin polyester film is combined with protective coatings and conductive layers in a way that provides bending resistance without significantly increasing total thickness, achieving the right balance between strength and weight.
Data Source
AI summary
Provided is a transparent conductive polyester film for a foldable display which is free of occurrence of a fold mark or a tear at a folding portion thereof to be used in a foldable display excellent in mass productivity, and free of a risk of causing distortion in an image displayed at a folding portion thereof, and a mobile device. The transparent conductive polyester film for a foldable display includes: a polyester film; and a transparent conductive layer laminated on at least one surface of the polyester film, wherein the polyester film satisfies the following conditions: (1) a refractive index in a bending direction is from 1.590 to 1.620; (2) a refractive index in a folding portion direction is from 1.670 to 1.700; (3) a refractive index in a thickness direction is 1.520 or less; and (4) a density is 1.380 g/cm3 or more, wherein the bending direction refers to a direction orthogonal to a folding portion of the polyester film at a time when the polyester film is folded.