Back Plate Member for Flexible Display Bonding Alignment
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Solution Overview
Problem
In flexible display apparatuses, bending stress causes cracks in link lines and damages panel driving circuit units due to misalignment and interference during the bonding process of the flexible display panel with the cover window.
Innovation Solution
A back plate member with a first and second supporting plate and an open part is used, where the first protective film includes a separation part overlapping the open part, and a second protective film is attached to the top of the back plate, allowing for pre-bending of the flexible display panel to prevent contact defects during bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the flexible display panel is bent during bonding to align with the cover window, then the bonding alignment is improved, but bending stress causes cracks in the link lines
Solution Approach 1:
The patent applies preliminary action by pre-bending the flexible display panel before the bonding process. The bending part is pre-formed to match the curvature of the cover window, so that when bonding occurs, no additional bending stress is applied to the link lines. This resolves the contradiction by preparing the panel in advance in a stress-free state.
Solution Approach 2:
The patent segments the flexible display panel into distinct functional areas: a flat pixel array part and a separate bending part with link lines. The bending part is specifically designed to be flexible and is pre-bent to match the cover window curvature, while the pixel array remains flat. This segmentation allows the link lines to be positioned in a neutral plane during bonding, preventing cracks while maintaining bonding alignment.
2Device complexity
If the panel driving circuit unit is positioned close to the cover window edge to reduce bezel width, then the device compactness is improved, but interference and contact damage occur during bonding
Solution Approach 1:
The patent resolves the spatial conflict by changing the dimensional arrangement. The panel driving circuit unit is positioned on the back surface of the flexible display panel rather than on the front surface near the cover window edge. This allows the circuit unit to be close to the edge for compactness while being separated from the bonding interface, preventing interference and contact damage during the bonding process.
3Adaptability or versatility
If the flexible display panel is made thinner to enable flexibility, then the flexibility is improved, but the structural strength decreases making bonding more difficult
Solution Approach 1:
The patent employs flexible shells and thin films by using a thin flexible substrate that can be bent to match the cover window curvature. The flexibility is achieved through the inherent properties of the flexible substrate material, which allows the thin panel to conform to the curved surface without breaking, resolving the contradiction between thinness for flexibility and structural strength.
Solution Approach 2:
The patent applies preliminary action by pre-bending the thin flexible panel to match the cover window curvature before bonding. This ensures that the thin flexible substrate is in the correct position and shape before the bonding process begins, eliminating the need for bending during bonding and preventing damage to the link lines despite the reduced structural strength from thinning.
Data Source
AI summary
Disclosed are a back plate member for flexible display, a display apparatus including the same, and a method of manufacturing the same, in which a bonding process of bonding a cover glass to a flexible display panel is easily performed. The back plate member includes a back plate including first and second supporting plates which are arranged in parallel with an open part therebetween, a first protective film including a first protection part attached to a bottom of the first supporting plate, a second protection part attached to a bottom of the second supporting plate, and a separation part overlapping the open part, and a second protective film attached to a top of the back plate, the second protective film having a plate shape.