Flexible Display Panel Bend Geometry for Narrow Bezel Strength
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Solution Overview
Problem
Existing display modules face challenges in achieving a narrow frame design while maintaining mechanical performance, as reducing the bending radius to minimize the frame size leads to increased stress on the wiring and risk of rupture, and thinning the module reduces mechanical integrity.
Innovation Solution
The display module incorporates a flexible display panel with a bending portion designed as a semielliptical arc shape, where the spacing D2 from the midpoint of the connecting line to the inner curved surface peak is less than half of the spacing D1 between the bending start and end points, ensuring the thickness and mechanical performance are maintained while reducing the frame size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the frame size of the display module is reduced, then the screen-to-body ratio is improved, but the mechanical performance deteriorates and wire rupture risk increases
Solution Approach 1:
The bending portion is designed with a semielliptical arc shape instead of a simple curved shape. This specific curvature geometry allows the frame to be reduced in size while distributing mechanical stress more evenly across the bending portion, preventing wire rupture and maintaining structural integrity.
Solution Approach 2:
The patent introduces specific parameter relationships (D2 < (D1/2) and the semielliptical arc shape) to control the geometry of the bending portion. By adjusting these geometric parameters, the design achieves both reduced frame size and maintained mechanical performance through optimized stress distribution.
2Length of moving object
If the frame size is reduced, then the module thickness can be reduced, but the mechanical integrity compromises
Solution Approach 1:
The semielliptical arc shape provides structural stability by creating a more robust bending portion geometry. This curvature design maintains mechanical integrity even when the overall module thickness is reduced, as the semielliptical shape better distributes mechanical loads compared to simple curved designs.
Solution Approach 2:
The bending portion is given special local quality through its semielliptical arc shape, making it stronger and more stable relative to the rest of the frame. This localized geometric optimization ensures that the bending portion can withstand mechanical stresses without compromising overall structural integrity.
3Length of moving object
If the bending portion is made thinner to reduce frame size, then the lower frame size is achieved, but stress on the bending portion increases
Solution Approach 1:
The semielliptical arc shape distributes stress more evenly across the bending portion compared to simple curved designs. This geometric optimization allows the bending portion to be thinner while reducing peak stress concentrations, thereby achieving both reduced frame size and lower stress levels.
Solution Approach 2:
By controlling the geometric parameters (D1, D2, and the semielliptical arc shape), the design optimizes stress distribution in the bending portion. These parameter relationships ensure that even when the bending portion is made thinner for a smaller frame, the stress remains manageable and wire rupture is prevented.
Data Source
AI summary
The present disclosure provides a display module, including: a flexible display panel, including: a first straight portion; a second straight portion, located on a back side of a light exiting surface of the first straight portion; and a bending portion, connected to the first straight portion and the second straight portion, wherein an inner curved surface includes a bending start point and a bending end point, a spacing between the bending start point and the bending end point is D1, a spacing from a midpoint of a connecting line between the bending start point and the bending end point to an inner curved surface peak of the inner curved surface is D2, and D1 and D2 satisfy a formula as follows: D2<(D1)/2.