Dummy Pixel Regions for OELD Substrate Gap Control
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Solution Overview
Problem
The dual panel type organic electroluminescent display (OELD) device faces issues with gap size differences between substrates, leading to potential non-contact between the organic electroluminescent diode and the driving TFT, due to step differences in laminated layers and patterns, which affects the production yield.
Innovation Solution
Incorporating dummy pixel regions in the power supply terminals with a similar structure and height to the pixel regions, and using transparent conductive materials for connection electrodes to ensure uniformity and contact between substrates, thereby eliminating step height discrepancies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dual panel type structure is used to separate array device and electroluminescent diode, then production yield is improved, but gap size consistency between substrates deteriorates
Solution Approach 1:
The patent introduces dummy pixel regions with the same structural characteristics as actual pixel regions, creating localized compensation structures in specific areas (power supply terminal regions) to balance the overall gap distribution between substrates
Solution Approach 2:
The patent modifies the structural parameters of the first substrate by adding dummy pixel regions with identical laminated layer heights and patterns, changing the local physical characteristics to compensate for gap variations in the dual panel configuration
2Ease of manufacture
If step differences in laminated layers and patterns exist, then manufacturing complexity is reduced, but contact reliability between organic electroluminescent diode and driving TFT deteriorates
Solution Approach 1:
The patent creates localized dummy structures in power supply terminal regions that replicate the step height characteristics of actual pixel regions, ensuring uniform contact surfaces without complicating the overall manufacturing process
Solution Approach 2:
The patent creates dummy pixel regions that are copies of actual pixel regions in terms of laminated layer structure and height, using simplified replicate structures to solve the contact reliability issue without requiring complex new manufacturing steps
Data Source
AI summary
A dual panel type organic electroluminescent display device includes first and second substrates and a plurality of pixel regions and a plurality of power supply terminals at upper and lower sides of the plurality of pixel regions thereon, and further includes a plurality of dummy pixel regions each having substantially the same structure as each pixel region in the plurality of power supply terminals.