Landscape Foldable Display Structure Extending Components Over Pads
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Solution Overview
Problem
As foldable display devices become larger, the length of data lines increases, leading to higher data resistance, particularly in portrait-oriented devices with a long aspect ratio in the vertical direction, and issues such as moisture permeation and cracking of pads due to resin lifting in the folding area.
Innovation Solution
A landscape-oriented foldable display device with a folding axis in the horizontal direction, where components of the display panel extend from the active to the non-active area to cover pads, omitting resin, and arranging ends of components in line to maintain a neutral plane and evenly distribute stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If portrait oriented foldable display device with long aspect ratio is used, then display area is increased, but data resistance increases
Solution Approach 1:
The patent changes the orientation from portrait to landscape, creating an asymmetric aspect ratio where the long dimension is horizontal rather than vertical. This reorientation reduces the length of data lines connecting to pads while maintaining large display area, thereby reducing data resistance without sacrificing display size.
2Reliability
If resin is used to cover pads in folding area, then moisture permeation is prevented, but resin lifting occurs due to continuous stress
Solution Approach 1:
The patent removes the resin layer from the folding area entirely. Instead of using resin to cover pads, the design allows pads to be directly covered by extending components (such as the common electrode and cover window) over the pads in the folding area, eliminating the resin lifting problem while maintaining moisture protection.
Solution Approach 2:
The patent merges the protective function previously performed by resin with the existing display components. The common electrode and cover window are extended to cover the pads, combining structural support and moisture protection functions into these existing components, eliminating the need for separate resin layer.
3Reliability
If components extend to cover pads, then moisture permeation is prevented and resin lifting is avoided, but manufacturing complexity increases
Solution Approach 1:
The patent makes existing components (common electrode, cover window) serve multiple functions: their primary display function plus an additional protective function by extending them to cover pads in the folding area. This multi-functionality approach prevents moisture permeation without adding separate protective components, thereby avoiding increased manufacturing complexity.
Data Source
AI summary
In a foldable display device, a base substrate includes an active area, a non-active area surrounding the active area, with pads being disposed in one or both side portions thereof, and a folding area overlapping a portion of the active area and the non-active area. A light-emitting element is disposed in the active area of the base substrate. A cover window is disposed on the light-emitting element. The light-emitting element and the cover window disposed in the folding area extend to the non-active area to support the pads.