Display Device Bridge Electrodes Flatness Transmittance
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Solution Overview
Problem
Existing display devices face challenges in ensuring the flatness of pixel electrodes and maintaining high transmittance, especially when an organic insulating layer is not provided.
Innovation Solution
A display device design that includes bridge patterns between adjacent display areas, with specific structures for pixels to secure flatness for pixel electrodes, and the use of planarization patterns in sub-display areas to enhance light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If bridge patterns are disposed between adjacent display areas, then connectivity between sub-display areas is improved, but flatness of pixel electrodes may deteriorate
Solution Approach 1:
The sub-display areas are divided into first and second sub-display areas with distinct electrode configurations. The first sub-display area contains subpixel electrodes and copy pixel electrodes, while the second sub-display area contains only copy pixel electrodes, creating segmented functional zones that maintain connectivity through bridge patterns while preserving local flatness characteristics
Solution Approach 2:
Different regions of the display device are given different electrode structures tailored to their specific functions. The first sub-display area uses a dual-electrode configuration for full functionality, while the second sub-display area uses a single-electrode configuration optimized for flatness and light transmittance, allowing each local region to have optimal properties for its purpose
2Manufacturing precision
If planarization patterns are added to the second sub-display area, then flatness is improved, but device complexity increases
Solution Approach 1:
The copy pixel electrodes in the second sub-display area serve dual functions: they maintain electrical connectivity through bridge patterns to the first sub-display area, and they provide a planarized surface that enhances light transmittance. This multi-functional design achieves flatness improvement without adding separate planarization structures, thereby avoiding increased device complexity
3Ease of manufacture
If organic insulating layer is removed, then manufacturing simplicity is improved, but transmittance may deteriorate
Solution Approach 1:
The organic insulating layer is completely removed from the second sub-display area, extracting only the essential functional elements (copy pixel electrodes and bridge patterns) needed for connectivity and flatness. This extraction eliminates the need for organic layer deposition while preserving light transmittance through the streamlined electrode structure
Data Source
AI summary
A display device includes a first sub-display area and a second sub-display area that are adjacent each other, and a main display area around the first and second sub-display areas, a plurality of pixel electrodes in the main display area and spaced from one another, a plurality of first subpixel electrodes in the first sub-display area and spaced from one another, a plurality of first copy pixel electrodes in the first sub-display area and connected to the first subpixel electrodes through first bridge electrodes, a plurality of planarization patterns in the second sub-display area, a plurality of second subpixel electrodes and a plurality of second copy pixel electrodes in the second sub-display area that overlaps the planarization patterns, and a plurality of second bridge electrodes that overlaps the second subpixel electrodes or the second copy pixel electrodes.