OLED Display Module Boundary Structure for Stress-Free Pad Bending
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Solution Overview
Problem
Existing display devices face manufacturing defects and reliability issues due to stepped portions between the pad unit of a display panel and a touch sensing member, particularly in the boundary area between the active and pad areas, which are prone to bending and stress during flexible display operations.
Innovation Solution
The display device integrates a boundary layer with an organic layer that eliminates the inorganic layer at the boundary area, allowing for a seamless transition between the display panel and touch sensing member pads, enhancing flexibility and reliability by using conductive patterns and touch electrodes to facilitate electrical connections without inorganic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an inorganic layer is disposed on the base layer at the boundary area, then manufacturing precision is improved, but flexibility and reliability deteriorate due to stepped portions between pad units
Solution Approach 1:
The patent removes the inorganic layer from the boundary area between the display panel pad unit and touch sensing member pad unit. This extraction of the inorganic layer eliminates the stepped portion that causes manufacturing defects and flexibility issues, while the inorganic layer is retained in other areas where it provides manufacturing precision benefits.
Solution Approach 2:
The patent applies different layer structures to different regions: the inorganic layer is present in the active area and pad area for manufacturing precision, but deliberately absent in the boundary area to ensure flexibility and eliminate stepped portions. This local differentiation resolves the contradiction between precision and flexibility.
2Strength
If a stepped portion exists between pad units, then inorganic layer protection is improved, but manufacturing defects increase due to alignment issues
Solution Approach 1:
The inorganic layer is extracted from the boundary area where it would create stepped portions and alignment issues during manufacturing. This removal eliminates the source of manufacturing defects while the inorganic layer remains protected in areas where it is needed.
Solution Approach 2:
The patent segments the inorganic layer coverage, applying it selectively to the active area and pad area while excluding the boundary area. This segmentation allows the inorganic layer to provide protection where needed without creating manufacturing alignment problems at the boundaries.
3Stability of the object's composition
If the boundary area contains inorganic layers, then structural stability is improved, but bending reliability deteriorates in flexible displays
Solution Approach 1:
The patent implements local quality by having the inorganic layer present in the active area and pad area for structural stability, but absent in the boundary area to enable flexible bending. This localized differentiation allows the display to maintain stability where needed while achieving flexibility at the boundaries.
Solution Approach 2:
The inorganic layer is taken out from the boundary area specifically to improve bending reliability in flexible displays. This extraction removes the rigid component that would prevent proper bending, while the rest of the structure maintains its stability.
Data Source
AI summary
Provided is an organic light emitting display module including an active area, a pad area, and a boundary area between the active area and the pad area. Unlike the active area and the pad area, since the boundary area does not include an inorganic layer, less stress is applied to the boundary area when the boundary area is bent. Display panel pads and touch sensing member pads are disposed at the same height without having a height difference therebetween. Thus, a dummy pad may be added to remove the height difference between the display panel pads and the touch sensing member pads.