Display Panel Substrate Layout for Narrow-Bezel Folded Bonding
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Solution Overview
Problem
Existing display technologies face challenges in reducing the border of the display apparatus and increasing the screen-to-body ratio, with rigid substrates limiting flexibility and requiring costly support layers for flexible substrates, which increase production costs and complexity.
Innovation Solution
A display panel design featuring a rigid first substrate and a flexible second substrate, where the second substrate overlaps partially with the first substrate, allowing the bending area to be folded towards the back side, reducing the border and enhancing the screen-to-body ratio without the need for expensive support layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid substrate is used for the display panel, then the structural strength is improved, but the flexibility and screen-to-body ratio deteriorate
Solution Approach 1:
The substrate is divided into two distinct parts: a rigid first substrate (glass or PMMA) that covers the display area and provides structural strength, and a flexible second substrate (polyimide or polyester) that covers the bending and bonding areas and enables flexibility. This segmentation allows each part to perform its specialized function without compromise.
Solution Approach 2:
Different regions of the display panel are assigned different substrate properties: the display area uses rigid substrate for protection and stability, while the bending and bonding areas use flexible substrate for deformability. This local differentiation of material properties optimizes both strength and flexibility where needed.
2Adaptability or versatility
If a flexible substrate is used to increase screen-to-body ratio, then the border reduction is improved, but the production cost and device complexity worsen due to required support layers
Solution Approach 1:
The display panel is segmented into a rigid first substrate and a flexible second substrate with distinct functional zones. The flexible second substrate is used only where bending is required, eliminating the need for support layers across the entire panel and reducing overall complexity.
Solution Approach 2:
The expensive support layers typically required for flexible substrates are extracted/removed from the design. Instead, a rigid substrate is strategically placed to cover only the display area, while the flexible substrate handles bending areas without requiring additional support structures.
3Adaptability or versatility
If the second substrate completely covers the first substrate, then the flexibility is improved, but the manufacturing precision and structural integrity worsen
Solution Approach 1:
The second substrate is designed with local quality differentiation: it has a first part with smaller width covering the bending and bonding areas, and a second part with larger width extending to the transition area. This localized coverage optimization improves alignment precision while maintaining necessary flexibility.
Solution Approach 2:
Instead of the second substrate completely covering the first substrate, only the necessary portions are covered: the first part covers bending and bonding areas for flexibility, while the second part extends to the transition area for alignment. This partial coverage approach balances flexibility with manufacturing precision.
Data Source
AI summary
The present disclosure discloses a display panel, having a display side and a back side that are disposed opposite each other, and including a display area, a bonding area, and a transition area and a bending area that are located between the display area and the bonding area, where the transition area is located between the bending area and the display area; the display panel further includes: a first substrate, where the first substrate is a rigid substrate, and the first substrate exposes at least the bending area and the bonding area and covers the display area; and a second substrate, disposed on a side of the first substrate that is close to the display side of the display panel; where the second substrate is a flexible substrate; the second substrate exposes at least a part of the display area and covers the bending area and the bonding area.