Display Device Conductive Pattern Design via Vertical Stacking
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Solution Overview
Problem
The existing display devices face challenges in freely designing conductive patterns due to the dense formation of conductive patterns in the pixel circuit part, limiting the flexibility in shaping and increasing the number of contact holes required for electrical connections.
Innovation Solution
A display device structure is introduced with a specific arrangement of conductive patterns and contact holes, where the driving voltage is transferred through a sequence of source patterns and an intermediate pattern, reducing the need for additional contact holes and allowing for more flexible design of the third source pattern's shape by using an organic insulating layer for some contact holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conductive patterns are densely formed to improve display quality, then display quality is improved, but design freedom of conductive patterns is lost
Solution Approach 1:
The pixel circuit part is divided into multiple layers with different conductive patterns (first, second, third source patterns) stacked vertically. This segmentation allows each layer to have optimized patterns for density while maintaining overall design freedom through selective connectivity via contact holes.
Solution Approach 2:
The patent transitions from two-dimensional planar conductive patterns to three-dimensional vertically stacked patterns. By adding the vertical dimension with multiple layers (first source pattern, intermediate pattern, second source pattern, third source pattern), the design achieves both high density and flexibility in pattern configuration.
2Illumination intensity
If conductive patterns are densely formed, then display quality is improved, but the number of contact holes increases
Solution Approach 1:
Multiple conductive patterns (first source pattern, intermediate pattern, second source pattern) are merged into a single integrated structure where they are electrically connected through direct vertical contact without requiring additional contact holes. This merging reduces the total number of contact holes while maintaining dense pattern formation.
Solution Approach 2:
The intermediate pattern acts as a mediator between the first source pattern and the second source pattern, enabling electrical connection through direct contact. This intermediary structure eliminates the need for separate contact holes that would otherwise be required to connect these layers.
3Area of stationary object
If conductive patterns are vertically stacked, then space utilization is improved, but manufacturing complexity increases
Solution Approach 1:
The patent changes the structural parameters of the pixel circuit by introducing vertically stacked conductive patterns with specific geometric configurations (e.g., the third source pattern surrounding portions of lower patterns). This parameter change optimizes space utilization while the patterns are formed using standard semiconductor manufacturing processes, keeping manufacturing complexity manageable.
Data Source
AI summary
A display device comprises a first pattern disposed on a substrate and receiving a driving voltage, a second pattern disposed on the first pattern and receiving the driving voltage, an intermediate pattern disposed on the first pattern and receiving the driving voltage, a first source pattern disposed on the intermediate pattern and contacting the first pattern, the second pattern, and the intermediate pattern, a second source pattern disposed in the same layer as the first source pattern and contacting the intermediate pattern, and a third source pattern disposed on the second source pattern and contacting the second source pattern.