Display Panel Bridge Power-Line Layout for Fewer Masking Steps
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Solution Overview
Problem
Existing display panel fabrication processes are inefficient due to the need for multiple masks to stack circuit elements and power lines vertically, increasing production time and complexity.
Innovation Solution
A display panel design where power lines and sub-pixels are efficiently arranged with overlapping and bypassing bridge patterns, allowing for separate power voltage application to adjacent sub-pixels, and including a gate line positioned between power lines, with transistors and capacitors forming pulse width modulation and pixel driving circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple masks are used to stack circuit elements and power lines vertically, then the power distribution efficiency is improved, but the fabrication time and process complexity increase
Solution Approach 1:
The patent combines multiple power lines (first power line and second power line) into a single planar layer structure rather than stacking them vertically with multiple masks. This merging approach maintains the ability to provide different power voltages to different sub-pixels while eliminating the need for complex multi-step masking processes, thereby reducing fabrication time and process complexity.
Solution Approach 2:
The patent transitions from a vertical stacking arrangement (third dimension) to a planar arrangement (first and second dimensions). By arranging power lines side-by-side in the same layer rather than stacking them vertically, the design achieves efficient power distribution while simplifying the fabrication process to require fewer masking steps.
2Ease of manufacture
If multiple masks are used to stack circuit elements and power lines vertically, then the spatial arrangement of power lines is optimized, but the process complexity increases
Solution Approach 1:
The patent merges the function of multiple vertically stacked power lines into a planar configuration where multiple power lines coexist in the same layer. This approach maintains spatial optimization for power distribution while reducing process complexity by eliminating multiple stacking operations.
Solution Approach 2:
The patent segments the power distribution function into multiple independent power lines (first power line, second power line) that operate in parallel within the same layer. Each power line can independently provide different power voltages to different sub-pixels, achieving functional segmentation without requiring vertical stacking.
3Productivity
If power lines are arranged to overlap sub-pixels in the vertical direction, then power delivery to sub-pixels is improved, but the fabrication process becomes more complex
Solution Approach 1:
The patent moves power line arrangement from vertical overlap (third dimension) to lateral adjacency in the same layer (first and second dimensions). This dimensional change maintains effective power delivery to sub-pixels while simplifying the fabrication process by eliminating the need for precise vertical alignment across multiple layers.
Solution Approach 2:
The patent creates a universal power line structure where multiple power lines in the same layer can serve different sub-pixels simultaneously. Each power line maintains its function of delivering power to specific sub-pixels while the overall structure benefits from simplified single-layer fabrication.
Data Source
AI summary
A display panel includes first and second sub-pixels, a 2a-th power line, and a 2b-th power line. The first sub-pixel is configured to emit light in a first range of wavelengths. The second sub-pixel is positioned in a first direction from the first sub-pixel and is configured to emit light in a second range of wavelengths. The 2a-th power line extends in the first direction and respectively overlaps the first and the second sub-pixels in a third direction. The 2a-th power line includes a bridge pattern extending from the 2a-th power line in a second direction. The 2a-th power line is electrically connected to the first sub-pixel through the bridge pattern. The 2b-th power line bypasses the bridge pattern and extends in the first direction. The 2b-th power line respectively overlaps the first and the second sub-pixels in the third direction and is electrically connected to the second sub-pixel.