Foldable Display Panel Roughness for Repeated-Folding Reliability
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Solution Overview
Problem
Existing flexible display devices face challenges in maintaining folding reliability and surface integrity, particularly in regions subjected to repeated folding, leading to potential damage and reduced durability.
Innovation Solution
A display device design featuring a display panel with distinct surface roughness in folding and non-folding regions, incorporating a thin-film glass window and anti-reflection layer, and a manufacturing process using lasers of different wavelengths for precise cutting to create recessed portions, ensuring consistent folding and improved structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel is made flexible to enable folding, then portability and user convenience are improved, but folding reliability and surface integrity deteriorate due to repeated folding stress
Solution Approach 1:
The patent applies different surface roughness values to different regions of the display panel. The folding region has a first surface roughness while the non-folding region has a second surface roughness, creating localized property differences that optimize both folding performance and overall durability
Solution Approach 2:
The patent introduces a recessed portion in the folding region before actual folding operations occur. This pre-formed structural feature prepares the display panel to accommodate folding stress, preventing damage during repeated folding cycles
2Strength
If the surface roughness is increased in non-folding regions, then surface integrity is improved, but folding flexibility deteriorates
Solution Approach 1:
The patent creates spatial variation in surface roughness by assigning different roughness values to folding and non-folding regions. This allows each region to be optimized for its specific function: smoothness for folding flexibility and appropriate roughness for surface integrity in non-folding areas
3Reliability
If precise cutting is performed to create recessed portions, then folding reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent replaces traditional mechanical cutting methods with laser cutting technology. This substitution enables precise creation of recessed portions in the folding region while simplifying the manufacturing process through a single integrated laser operation that can precisely control cut depth and position
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
Enhances folding reliability and reduces surface damage by optimizing surface roughness and cutting processes, resulting in a more durable and reliable flexible display device.
Implementation Method 1
A manufacturing method of a display device includes obtaining a display module including an effective region and a non-effective region from a mother substrate by performing a first cutting process along a first cutting line
Data Source
AI summary
A display device includes: a display panel comprising a folding region configured to be folded around a folding axis and a non-folding region adjacent to the folding region; and a window on the display panel and configured to be folded with the display panel, wherein: a side surface of the display panel has a first surface roughness in the folding region and a second surface roughness in the non-folding region; the first surface roughness is lower than the second surface roughness; and a side surface of the window has the same surface roughness in the non-folding region and the folding region.