Flexible OLED Pad Region Connection Structure for Touch Wiring
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Solution Overview
Problem
Flexible organic light emitting display (OLED) devices face challenges in efficiently integrating touch screen functionality while maintaining a compact form factor, particularly when bent, due to the complexity of connecting touch screen wirings and electrodes without increasing the peripheral region size and dead space.
Innovation Solution
The OLED device incorporates a substrate with a display region, a bending region, and a pad region, where touch screen wirings are electrically connected through a connection structure in the bending region, allowing for a reduced peripheral region size by overlapping the connection structure with the display region when bent, and utilizing pad electrodes for external device connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch screen wirings are connected through a conventional peripheral structure, then touch screen functionality is achieved, but the peripheral region size and dead space increase
Solution Approach 1:
The connection structure is moved from the peripheral region to overlap with the display region when the device is bent. This spatial reconfiguration in the third dimension (when bent) allows touch screen wiring connections without increasing the peripheral region footprint, effectively using the display region area during the bent state to accommodate connection structures.
Solution Approach 2:
The connection structure is nested within or overlaps the display region when bent, allowing the touch screen wiring connections to be contained within the overall device footprint. The connection structure is positioned such that it utilizes the display region space during bending, similar to how nested dolls occupy space within each other.
2Adaptability or versatility
If the device is made flexible with bending capability, then form factor adaptability is improved, but wiring connection complexity increases
Solution Approach 1:
The device is segmented into distinct functional regions: display region, bending region, and pad region. The connection structure is specifically positioned in the pad region and configured to overlap the display region when bent. This segmentation allows touch screen wirings to be connected in a controlled manner during bending without increasing overall complexity.
3Area of stationary object
If the peripheral region is reduced for compact design, then device compactness is improved, but wiring connection space is reduced
Solution Approach 1:
The connection structure utilizes the vertical/depth dimension by overlapping the display region when the device is bent. This allows wiring connections to be made without requiring additional peripheral space, as the connection is achieved through spatial reconfiguration in the bent state rather than through peripheral region expansion.
Data Source
AI summary
An OLED device includes a substrate including a display region including a pixel region and a peripheral region surrounding the pixel region. A pad region is spaced apart from the display region, and a bending region is disposed between the display region and the pad region. A plurality of pixel structures are disposed in the pixel region on the substrate. A touch screen structure is disposed on the pixel structures. A plurality of touch screen wirings are disposed in the bending region on the substrate. The touch screen wirings are electrically connected the touch screen structure. A connection structure is in the pad region. The connection structure electrically connects touch screen wirings to each other. A same touch sensing signal is applied to touch screen wirings that are connected to each other.