Bent Edge Display Panel with Buffer Layers for Bezel Reduction
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Solution Overview
Problem
Conventional display modules have a significant bezel area that reduces the display area, and existing technologies fail to effectively minimize defects in the bezel region, particularly in multi-media devices like smartphones and televisions.
Innovation Solution
A display module design featuring a display panel with bent edge parts that extend away from a window member, incorporating a dummy member to manage stress and reduce bezel area, while including a touch panel and protective frame to enhance durability and optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the bezel area is reduced to increase display area, then the display area is improved, but the structural strength and defect resistance in the bezel region deteriorate
Solution Approach 1:
The display panel is segmented into a display region and a bent edge region, allowing different structural configurations in different areas. The bent edge portion is further divided into multiple layers including circuit layers, encapsulation layers, and buffer layers, each serving specific functions to maintain reliability while minimizing bezel area.
Solution Approach 2:
Buffer layers are pre-installed at the bent edge portions before assembly, providing stress relief and protection against defects. The encapsulation layers are designed to extend into the bent regions in advance, creating a protective cushion that prevents cracks and defects before they can propagate into the display area.
2Area of moving object
If the edge part is bent to extend away from the window member to reduce bezel area, then the display area is improved, but the stress on the circuit layer increases
Solution Approach 1:
Buffer layers are introduced as intermediary elements between the bent edge portion and the circuit layers. These buffer layers absorb and distribute the stress generated by bending, preventing direct transmission of stress to the sensitive circuit layer. The encapsulation layers also serve as intermediaries that protect the circuit layer from environmental stress.
Solution Approach 2:
The stress state of the circuit layer is changed from tensile stress to compressive stress through the design of the bent edge portion and buffer layers. This parameter change in stress type prevents crack propagation and improves the reliability of the circuit layer in the bent region.
3Area of moving object
If the bezel area is minimized to achieve wider display area, then the display area is improved, but the protection and support for internal components deteriorate
Solution Approach 1:
Multiple protective and supportive structures are nested within each other: the encapsulation layers are nested within the bent edge portion, which is nested within the display panel, which is then nested within the protective frame. This nested arrangement provides multiple layers of protection and support while maintaining a compact structure with minimal bezel area.
Solution Approach 2:
The display panel employs composite material structures, particularly in the bent edge portion which combines multiple layers of different materials (circuit layers, encapsulation layers, buffer layers) with complementary properties. This composite structure provides both flexibility for bending and sufficient strength for protection.
Data Source
AI summary
A display module includes a window member including a display area and a bezel area, a display panel including a display part corresponding to the display area, and an edge part corresponding to the bezel area and bent from the display part to extend away from the window member, and a protective frame accommodating the display panel and coupled to the window member.