Foldable Display Position Restricting Bar
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Solution Overview
Problem
Foldable mobile phones suffer from significant fold marks due to the small bending radius required for their screens, leading to plastic deformation and irreversible damage, which affects the display quality and market expansion.
Innovation Solution
A foldable display device with a connection structure that includes a first and second folding frame, a position restricting bar, and chutes, allowing the flexible display module to unfold beyond 180 degrees, reducing stress and preventing fold marks by maintaining a flat state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the bending radius of the screens is designed to be very small to control the size of the whole machines, then the size of the whole machines is reduced, but plastic deformation of materials of film layers at bending regions becomes very significant causing obvious fold marks
Solution Approach 1:
The patent changes the unfolding angle parameter from the conventional 180 degrees to greater than 180 degrees (specifically 181-183 degrees). This parameter change allows the flexible display module to be slightly stretched upon unfolding, which helps restore the flat state and reduces fold marks while maintaining the compact folded size
Solution Approach 2:
The patent introduces a dynamic position restricting component that can adjust the unfolding angle within a specific range (181-183 degrees). This dynamic adjustment capability allows the system to optimize the display flatness after folding and unfolding operations, reducing the accumulation of fold marks while maintaining compact size
2Adaptability or versatility
If the screens are folded and unfolded repeatedly, then the display area is increased without significantly increasing machine size, but microscopic damage between materials accumulates and becomes macroscopic visible fold marks
Solution Approach 1:
By changing the unfolding angle parameter to slightly greater than 180 degrees, the patent creates a restoring effect that helps the flexible display module return to a flat state after each folding cycle. This reduces the accumulation of microscopic damage and prevents it from becoming visible fold marks
Solution Approach 2:
The position restricting component is designed to automatically adjust the unfolding angle to the optimal range (181-183 degrees) after each folding operation. This preliminary action of restoring the flat state prevents the accumulation of damage before the next folding cycle begins
3Weight of moving object
If the bending radius is reduced for ultra-light and thin design, then the device becomes lighter and thinner, but plastic deformation of module materials increases proportionally causing irreversible damage
Solution Approach 1:
The patent changes the unfolding angle parameter to slightly greater than 180 degrees, which creates a stretching effect that counteracts the plastic deformation caused by small bending radius. This helps maintain material integrity while enabling ultra-light and thin design
Data Source
AI summary
A foldable display device includes a folding module and a flexible display module. The folding module includes a first folding frame, a second folding frame disposed relatively to the first folding frame, and a connection structure connected to the first folding frame and the second folding frame. The connection structure includes a position restricting component. The first folding frame and the second folding frame are folded or unfolded relating to a shaft of the folding module. When the first folding frame and the second folding frame are completely unfolded, a position restricting angle between the first folding frame and the second folding frame is restricted by the position restricting component. A flexible display module is disposed on the first folding frame, the second folding frame, and the connection structure.