Mini LED Pixel Island Pad Layout for High-PPI Alignment
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Solution Overview
Problem
The challenge of aligning and connecting subdivided Mini LED pixel islands to a driving backplane is exacerbated by the need for one-to-one correspondence with increased sub-pixels, leading to alignment difficulties and inefficient use of space on the backplane.
Innovation Solution
The display panel design includes a rearrangement of electrode pads and driving circuits into sets, with multiple electrode pads connected via leads to sub-pixels and positive pads, allowing for efficient alignment and connection without vertical overlap, utilizing overlapping leads and bridging portions to ensure electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of sub-pixels in each pixel island is increased to achieve high PPI display, then the display resolution is improved, but the alignment difficulty and device complexity increase
Solution Approach 1:
The pixel islands are subdivided into multiple sub-pixels (first sub-pixels with same color and second sub-pixels with different colors) within each pixel island. This segmentation allows high PPI display by creating more display elements while managing complexity through organized grouping and color classification of sub-pixels.
Solution Approach 2:
The electrode pad arrangement uses a non-one-to-one correspondence in the row direction (more electrode pads than sub-pixel rows) to create a mapping relationship that simplifies alignment. This dimensional transformation in the pad layout resolves the alignment difficulty by providing redundant reference points and more flexible connection paths.
2Device complexity
If electrode pads are arranged in one-to-one correspondence with sub-pixels, then the electrical connection is simplified, but the space utilization on the backplane becomes inefficient
Solution Approach 1:
Multiple first electrode pads in the same row are electrically connected to sub-pixels in the same row through common leads. This merging of connection paths reduces the number of individual connections needed while maintaining proper electrical connectivity, thereby improving space utilization without significantly increasing connection complexity.
Solution Approach 2:
The electrode pad sets serve multiple functions: they provide electrical connection points for sub-pixels, act as alignment reference markers during transfer, and enable flexible wiring configurations. This multi-functionality allows the same structure to address both connection simplicity and space efficiency requirements.
3Manufacturing precision
If the number of electrode pads exceeds the number of sub-pixel rows, then the alignment precision is improved, but the device complexity increases
Solution Approach 1:
The electrode pads are pre-positioned in a grid pattern with more pads than sub-pixel rows before the actual sub-pixel placement. This preliminary arrangement of reference points enables precise alignment during the transfer process, as the extra pads provide additional alignment markers that guide the positioning of sub-pixels accurately.
Data Source
AI summary
A display panel and a display device, including: a driving backplane, including a substrate, one or more driving circuits arranged in an array on the substrate, and one or more positive pads arranged on a side of the driving circuits facing away from the substrate; one or more pixel islands on the driving backplane, the pixel island including one or more first sub-pixels; one or more first electrode pad sets between the pixel islands and the driving backplane, and an orthographic projection of a first electrode pad set on the substrate being located in an orthographic projection of a corresponding pixel island on the substrate; the first electrode pad set including one or more first electrode pads, and the first electrode pads being bonded and connected to the positive pads.