Shared Node Transistor Structure for OLED Pixel Aperture
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Solution Overview
Problem
The complexity of organic light emitting display devices increases with the addition of signal lines for various functions, leading to manufacturing difficulties, high defect rates, and reduced numerical aperture and lifespan.
Innovation Solution
A compact pixel structure is achieved by using a shared node and individual nodes for transistors, with a semiconductor layer between them, and a connection pattern for efficient signal line connections, along with a sensor and compensator for luminance deviation compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If various functions (sensing, compensation) are added to pixels, then functionality is improved, but device complexity increases
Solution Approach 1:
Multiple first transistors from different pixels share a common node on the reference voltage line, merging previously separate components into a shared structure. This reduces the total number of discrete transistor nodes while maintaining individual pixel functionality for sensing and compensation operations.
Solution Approach 2:
The shared node on the reference voltage line serves multiple functions simultaneously - it acts as a common electrical connection point, a sensing node for multiple pixels, and a compensation node. This multi-functional design allows the same structural element to support various pixel operations without requiring separate dedicated structures for each function.
2Adaptability or versatility
If the number of signal lines increases, then functionality is improved, but manufacturing difficulty increases
Solution Approach 1:
The patent merges multiple signal line connections into a shared node on the reference voltage line. Instead of requiring separate connection points for each transistor, multiple transistors share the same node, effectively reducing the number of distinct signal line intersections and connection points that need to be manufactured with high precision.
3Adaptability or versatility
If the number of IC pads and ICs increases, then functionality is improved, but pixel structure complexity increases
Solution Approach 1:
By merging multiple transistor nodes into shared nodes on reference voltage lines, the patent reduces the total number of discrete connection points that would otherwise require separate IC pad connections. This consolidation decreases the number of required IC pads and simplifies the overall pixel structure while preserving sensing and compensation capabilities.
4Adaptability or versatility
If pixel structure becomes complicated, then functionality is improved, but numerical aperture decreases
Solution Approach 1:
The shared node structure allows multiple transistors to occupy less individual space by sharing common connection regions. This consolidation frees up pixel area, increasing the numerical aperture while maintaining all necessary sensing and compensation functions through the shared node architecture.
Data Source
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AI summary
Disclosed are a transistor structure for a display and an organic light emitting display device (10). The transistor structure includes: a voltage line (RVL) positioned in one direction and configured to supply voltage to pixels (P); and two or more transistors (T11, T12, T13, T14) which share one of drains and sources which are formed integrally with the voltage line (RVL) and respectively include the other of the drains and sources which are individually formed and connected with different nodes (N1) directly or through a connection pattern