Stepped Display Pad Layout to Reduce Visible Dead Space
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Solution Overview
Problem
The presence of non-display areas in display devices reduces user immersion due to visibility of non-functional components, such as fan-out lines and pads, which detract from the viewing experience.
Innovation Solution
A display device design featuring a substrate with a display part and a pad part protruding in a different direction, where the pad part has a narrower width and a concave-convex shaped printed circuit board that follows the shape of the pad part, reducing the visible dead space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a conventional flat pad part is used, then the manufacturing process is simple, but the visible dead space increases and user immersion is reduced
Solution Approach 1:
The pad part is designed with a three-dimensional stepped structure instead of a conventional flat shape. The first pad portion has a greater height than the second pad portion, creating vertical dimensionality that reduces the visible dead space from the front view while maintaining electrical functionality.
Solution Approach 2:
The concave portion is formed by integrating the second pad portion with a lower height into the structure of the first pad portion with greater height. This nested configuration allows the printed circuit board to be positioned closer to the display area, reducing the overall dead space without adding separate structural elements.
2Area of stationary object
If the pad part width is reduced to minimize dead space, then the visible non-display area decreases, but the electrical connection area may be compromised
Solution Approach 1:
The design transitions from a two-dimensional width reduction approach to a three-dimensional height-based approach. By creating a stepped structure where the first pad portion has greater height than the second pad portion, the patent maintains adequate electrical connection area on the wider first portion while presenting a narrower profile from the front view, thus reducing visible dead space without compromising electrical reliability.
3Shape
If a concave-convex shape is added to the printed circuit board, then the dead space is reduced and aesthetic appeal is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The concave-convex shape is merged with the pad part structure itself. The first pad portion with greater height and the second pad portion with lesser height form an integrated stepped structure that creates the concave-convex profile. This merging of the pad part geometry with the overall device shape reduces dead space and improves aesthetics while distributing manufacturing complexity across a unified structure rather than requiring separate precision components.
Data Source
AI summary
A display device includes a substrate including a display part having a first width in a first direction and a pad part protruding from the display part in a second direction crossing the first direction and having a second width in the first direction, the second width being smaller than the first width, and a printed circuit board having a concave-convex shape towards the substrate. As the printed circuit board has the concave-convex shape, a dead space of the display device is reduced.