Flexible Display Wiring Structure for Impact-Resistant Pixel Control
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Solution Overview
Problem
Existing display devices face challenges in enhancing the strength of flexible display devices to protect against external impacts without compromising the accuracy of signal control and emission control of display elements.
Innovation Solution
A flexible display device is designed with an inorganic insulating layer having a groove between pixels, filled with an organic material layer, and featuring connection wirings with a higher elongation rate than the scan lines, which are insulated from each other to absorb and distribute external impact effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of TFTs and wirings electrically connected to one display element is increased to improve control accuracy, then the emission control precision is improved, but the device complexity and susceptibility to external impact increases
Solution Approach 1:
The display device is divided into multiple display elements (pixels, sub-pixels) each with dedicated control TFTs and wirings. This segmentation allows independent control of each element while distributing the complexity across multiple simple units rather than one complex control system
Solution Approach 2:
Connection wirings are introduced as intermediary elements that bridge the control TFTs and display elements. These wirings serve as mediators that transmit control signals from the control circuitry to the display elements, enabling precise control while isolating the complexity of the control logic from the display elements themselves
2Measurement precision
If the display device structure is made more complex with additional layers and wirings to improve control precision, then the emission control accuracy is improved, but the strength and impact resistance deteriorates
Solution Approach 1:
An organic insulating layer is formed beforehand to fill grooves in the inorganic insulating layer, creating a cushioning structure that absorbs and distributes external impact forces before they can reach and damage the underlying TFTs and wirings
Solution Approach 2:
The display device employs a composite structure combining inorganic insulating layers with grooves and organic insulating material filling those grooves. This composite design provides both the electrical insulation and structural strength needed to protect the delicate control elements while maintaining control precision
3Strength
If connection wirings with higher elongation rate than scan lines are used to improve flexibility and impact resistance, then the strength against external impact is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The elongation rate is used as a key parameter to differentiate connection wirings from scan lines. By controlling the elongation rate parameter, the design achieves flexible, impact-resistant connection structures while maintaining distinguishable manufacturing characteristics that can be controlled within standard fabrication tolerances
Data Source
AI summary
A display device includes a substrate including a display area and a peripheral area disposed outside of the display area. The display area includes a plurality of pixels. The display device further includes an inorganic insulating layer disposed in the display area. The inorganic insulating layer includes a groove disposed in a region between the plurality of pixels. The display device further includes an organic material layer filling the groove, a first connection wiring, and a second connection wiring. The first connection wiring is disposed on the organic material layer, overlaps the plurality of pixels, and extends in a second direction. The second connection wiring is insulated from the first connection wiring, and extends in a first direction that crosses the second direction.