Bending-Substrate Display Panel for Seamless Tiled Edges
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Solution Overview
Problem
Current tiling technology in large format displays results in discontinuity of display images due to side traces occupying space, causing a gap between outermost pixels and edges, which affects display quality.
Innovation Solution
A display panel design with a first substrate having a planar and bending portion, a second substrate, light-emitting components, a bonding layer, and a driving component on the bending portion, where the bending portion's projection does not exceed the second substrate, ensuring seamless tiling by preventing protrusion and maintaining consistent pixel distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If side traces are used to connect back side chips, then electrical connection is achieved, but the side traces occupy area causing distance between outermost pixels and edges to be greater than pixel distance, resulting in display image discontinuity
Solution Approach 1:
The patent moves the driving component from the traditional planar area to the bending portion of the substrate, utilizing the third dimension (bending space) to relocate electrical connection elements. This dimensional transition allows the driving component to be positioned without occupying pixel space, thereby maintaining display image continuity while achieving electrical connection.
Solution Approach 2:
The driving component is nested within the bending portion structure, where the bending portion itself serves as the mounting substrate. This nesting approach integrates the electrical connection function within the existing substrate geometry without requiring additional external space, thus preventing display discontinuity.
2Ease of manufacture
If driving component is disposed on the planar portion, then electrical connection is simplified, but the driving component and its traces affect the tiling process and cause discontinuity
Solution Approach 1:
The substrate is segmented into a planar portion and a bending portion, with distinct functional assignments. The planar portion maintains display pixel arrangement while the bending portion houses the driving component. This segmentation separates the electrical connection function from the display area, allowing independent optimization of both tiling alignment and electrical connection.
Solution Approach 2:
The driving component is extracted from the planar display area and relocated to the bending portion. This extraction removes the interfering element (driving component) from the critical tiling region, eliminating its negative impact on tiling alignment while preserving its electrical connection function through the bending portion's trace structure.
3Area of moving object
If bending portion projection extends beyond second substrate, then driving component has sufficient mounting area, but protrusion affects tiling and causes display discontinuity
Solution Approach 1:
The bending portion is designed with specific local geometric characteristics (L-shaped or U-shaped contour) that provide sufficient mounting area for the driving component while ensuring the projection remains within the second substrate boundaries. This localized quality control allows the bending portion to fulfill both functions: providing mounting space and maintaining tiling compatibility.
Data Source
AI summary
A display panel includes a first substrate, a second substrate, a plurality of light-emitting components, a bonding layer and a driving component. The first substrate includes a planar portion and a bending portion. The second substrate is disposed on the first substrate. The light-emitting components are disposed on the second substrate. The bonding layer is disposed between the planar portion of the first substrate and the second substrate. The driving component is disposed on a first surface of the bending portion of the first substrate and electrically connected to the light-emitting components. The first surface of the bending portion extends from a surface of the planar portion adjacent to the second substrate, and a projection of the bending portion in a vertical direction falls within the second substrate. A tiled display device including multiple display panels and a manufacturing method of the display panel are also provided.