Subpixel Electrode Layout for Mixed-Length LEDs and Narrow Bezels
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Solution Overview
Problem
Existing display devices face challenges in efficiently arranging light emitting elements of different lengths within subpixels to achieve precise color reproduction and reduce bezel width.
Innovation Solution
The display device incorporates light emitting elements of varying lengths in different subpixels, with electrodes spaced differently to accommodate these elements, allowing for individual light emission and reduced bezel width through the use of banks and insulating layers to separate and protect the elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light emitting elements of different lengths are arranged in subpixels, then color accuracy is improved, but electrical connection reliability deteriorates due to potential misalignment during inkjet printing
Solution Approach 1:
The subpixel is segmented into multiple electrode portions with different widths corresponding to different light emitting element lengths. The first electrode includes a first electrode portion and a second electrode portion, where the first electrode portion has a first width and the second electrode portion has a second width different from the first width. This segmentation allows each electrode portion to reliably connect to light emitting elements of specific lengths, preventing misalignment during inkjet printing while maintaining color accuracy.
2Manufacturing precision
If electrode widths are varied to match different light emitting element lengths, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The electrode is divided into multiple portions with different widths along the first direction. Each electrode portion is designed to correspond to light emitting elements of a specific length, enabling precise alignment during manufacturing. The segmented structure allows for standardized production processes while achieving high precision electrode-to-element alignment.
Solution Approach 2:
Different portions of the electrode have different local properties (widths) to match the specific requirements of different light emitting element lengths. The first electrode portion has a first width optimized for connecting to light emitting elements of a first length, while the second electrode portion has a second width optimized for connecting to light emitting elements of a second length. This local differentiation achieves manufacturing precision without requiring complete redesign of the entire electrode structure.
Data Source
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AI summary
A display device includes subpixels, each of the subpixels including a first electrode extending in a first direction, a second electrode extending in the first direction and spaced apart from the first electrode in a second direction, and light emitting elements disposed on the first electrode and the second electrode and extending in a direction, wherein the subpixels includes a first subpixel including first light emitting elements having a first length in the direction and a second subpixel including second light emitting elements having a second length greater than the first length in the direction.