Stretchable Display Device with Shared Connection Lines
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Solution Overview
Problem
Conventional display devices lack flexibility and efficiency in design, particularly in minimizing connection lines and optimizing storage capacitor size, which affects their stretchability and reliability.
Innovation Solution
A stretchable display device with a pattern layer on a flexible substrate, featuring a redundancy LED and reduced connection lines, allowing for a small-sized storage capacitor and improved pixel circuit driving, with a constant power voltage applied to the storage capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of connection lines is reduced, then the stretching reliability is improved, but the complexity of connecting pixels worsens
Solution Approach 1:
Multiple connection lines are merged into a single shared connection line that serves multiple pixels. The pixel circuits share common connection lines for power supply and signal transmission, reducing the total number of lines while maintaining proper connectivity through the shared bus structure.
Solution Approach 2:
Connection lines are designed to serve multiple functions and multiple pixels simultaneously. A single connection line acts as a universal bus that can supply power, transmit signals, and connect multiple pixel circuits, eliminating the need for dedicated lines for each pixel.
2Area of moving object
If the storage capacitor size is reduced, then the pixel area is minimized, but the driving capability deteriorates
Solution Approach 1:
The storage capacitor is designed with optimized parameters including high dielectric constant materials and adjusted capacitance values that are sufficient for the reduced pixel area. The capacitor parameters are tuned to maintain adequate charge storage capability while occupying minimal space within the compact pixel structure.
3Reliability
If redundancy LED is added, then the yield is improved, but the device complexity increases
Solution Approach 1:
A redundancy LED is incorporated into each pixel circuit as a backup component. This redundancy LED remains inactive during normal operation but can be activated to compensate for LED failures, providing fault tolerance and improving manufacturing yield without adding significant operational complexity.
Data Source
AI summary
A display device according to an example embodiment of the present disclosure may include a stretchable lower substrate; a pattern layer disposed on the lower substrate and including a plurality of plate patterns and a plurality of line patterns; a plurality of pixels disposed on each of the plurality of plate patterns; and a plurality of connection lines disposed on each of the plurality of line patterns to connect the plurality of pixels, wherein each of pixel circuits formed in the plurality of pixels includes at least one light emitting element, a driving transistor, a storage capacitor, and a first transistor to a fifth transistor, and a constant power voltage may be applied to the storage capacitor.