Flexible Substrate Work Function Control for Delamination
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Solution Overview
Problem
The manufacturing process of flexible display devices often results in defects due to delamination electrification during the separation of the flexible substrate from the supporting substrate, primarily caused by a mismatch in work function values between the two materials, leading to high delamination electrification voltage and potential defects.
Innovation Solution
Doping the flexible substrate with n-type or p-type dopants to adjust its work function to match that of the supporting substrate, thereby reducing the delamination electrification voltage and preventing defects, and including a buffer layer and encapsulation layer to protect the display unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the flexible substrate is separated from the supporting substrate during manufacturing, then the flexible display device can be produced, but delamination electrification occurs causing defects
Solution Approach 1:
The patent applies preliminary action by doping the flexible substrate with dopants before the separation process to adjust its work function in advance. This pre-adjustment of electrical properties prevents delamination electrification defects during the subsequent separation of the flexible substrate from the supporting substrate, ensuring defect-free manufacturing while maintaining productivity.
2Reliability
If the work function of the flexible substrate is adjusted to match the supporting substrate, then delamination electrification voltage is reduced, but additional doping processes are required
Solution Approach 1:
The patent applies parameter changes by modifying the work function parameter of the flexible substrate through dopant addition. By changing the electrical parameter (work function) to match that of the supporting substrate, the patent reduces delamination electrification voltage and prevents manufacturing defects, accepting the additional process step as necessary for achieving reliable production.
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 method effectively reduces delamination electrification voltage and increases the reliability of the flexible display device by ensuring equal work function values between the flexible and supporting substrates, minimizing defects and enhancing manufacturing process reliability.
Implementation Method 1
a flexible substrate doped with a dopant to control a work function of the flexible substrate
Data Source
AI summary
A flexible display device includes a flexible substrate doped with a dopant so as to control a work function of the flexible substrate; a display unit formed on the flexible substrate, and including a plurality of pixel circuit layers and a plurality of emission layers; and an encapsulation layer formed to cover the display unit.