Display Device Active Layer Static Discharge Path
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Solution Overview
Problem
Organic light-emitting display devices face damage from static electricity during the manufacturing process due to the lack of a path for discharging static electricity on the active layers of transistors.
Innovation Solution
The display device incorporates a design where the active layer of each sub-pixel is connected to adjacent active layers, forming a path for static electricity discharge, and the initialization voltage lines are separated to prevent short circuits and ensure uniform voltage application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the active layer is formed in an island pattern for each pixel, then the device complexity is reduced and manufacturing is simplified, but the active layer becomes vulnerable to static electricity damage due to lack of discharge path
Solution Approach 1:
The patent merges adjacent active layers of different pixels through conductive structures, creating a unified conductive network that allows static electricity to discharge across multiple pixels rather than being confined to isolated islands. This merging maintains the simplified island pattern manufacturing while adding reliability through interconnected discharge paths.
Solution Approach 2:
The patent introduces intermediary conductive structures (such as conductive layers or bridging elements) between isolated active layers. These intermediaries serve as discharge pathways that connect previously isolated active regions, enabling static electricity to flow safely without requiring a complete redesign of the pixel structure.
2Device complexity
If initialization voltage lines are combined into a single line, then the device complexity is reduced, but short circuits may occur and voltage uniformity cannot be ensured
Solution Approach 1:
The patent segments the initialization voltage supply into multiple separate voltage lines instead of using a single combined line. This segmentation prevents short circuits by isolating voltage paths and ensures uniform voltage distribution across different pixel regions, as each line can be independently controlled and optimized.
Solution Approach 2:
The patent designs the multiple initialization voltage lines to maintain equipotential conditions across the display panel during initialization. By providing separate dedicated lines, the system ensures that all pixels receive the same initialization voltage simultaneously, preventing potential differences that could lead to short circuits or non-uniform initialization.
Data Source
AI summary
A display device includes: a plurality of scan lines; and a plurality of sub-pixels, each of the sub-pixels comprising a driving transistor, a plurality of transistors connected to the plurality of scan lines, and a light-emitting element electrically connected to the driving transistor. Each of the sub-pixels comprises an active layer comprising a channel region, a first electrode, and a second electrode of each of the plurality of transistors. A first scan line among the plurality of scan lines comprises a first extension extended in a first direction and a first protrusion extended in a second direction intersecting the first direction. The active layer overlaps with the first protrusion in a plan view.