Monolithic LED Strip Assembly for High-Resolution Displays
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Solution Overview
Problem
The use of discrete LED chips in display panel manufacturing is time-consuming and low-yield, especially for high-resolution displays with small pixels less than 100 micrometers, due to high costs and manufacturing inaccuracies.
Innovation Solution
Monolithic LED strips are used instead of discrete LED chips, with guide strips to align and increase the light emission area, allowing for faster and more accurate assembly of high-resolution displays by mounting the LED strips in a parallel configuration on a flexible display backplane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If discrete LED chips are used in display panel manufacturing, then individual LED placement flexibility is achieved, but manufacturing time increases and production yield decreases
Solution Approach 1:
Multiple discrete LED chips are merged into a single monolithic LED strip structure, allowing multiple LEDs to be transferred and positioned simultaneously rather than individually. This merging approach maintains the flexibility of discrete placement while dramatically reducing assembly time and increasing productivity.
Solution Approach 2:
The LED strip is segmented into multiple independently controllable LED sections along its length, allowing selective activation and positioning of individual LED regions. This segmentation enables the strip to function similarly to discrete chips while benefiting from the streamlined transfer process.
2Manufacturing precision
If discrete LED chips are used for high-resolution displays with small pixels, then precise pixel positioning is required, but manufacturing accuracy decreases and costs increase
Solution Approach 1:
Guide strips are introduced as intermediary structures to facilitate precise positioning of the monolithic LED strip. These guide strips provide physical reference features that enable accurate alignment and placement of the LED strip on the display substrate, achieving high positioning accuracy without the complexity of manual discrete chip placement.
3Productivity
If monolithic LED strips are used instead of discrete chips, then manufacturing time is reduced, but alignment precision of multiple strips must be maintained
Solution Approach 1:
Guide strips serve as intermediary alignment structures that provide physical reference features for positioning multiple monolithic LED strips relative to each other. These guide strips ensure consistent spacing and alignment across multiple strips, maintaining manufacturing precision while enabling efficient parallel assembly.
Solution Approach 2:
Multiple identical guide strips are used across the display substrate, providing replicated reference features that ensure consistent alignment of multiple LED strips. This copying approach allows for standardized, repeatable positioning across the entire display area.
Data Source
AI summary
Instead of discrete LED chips, monolithic LED strips reduce manufacturing time and inaccuracy when building high-resolution displays with small LED pixels of less than 100 micrometers. Guide strips next to LED strips align the monolithic LED strips and increase light emission area. A monolithic LED strip formed on a substrate has a P contact and an N contact. A first transfer layer is on an upper surface of the monolithic LED strip. The first transfer layer separates the monolithic LED strip from the substrate. A second transfer layer applied to the lower surface of the monolithic LED strip separates the monolithic LED strip from the first transfer layer. A display backplane is prepared with positive electrodes, negative electrodes, positive contact pads, and negative contact pads.