Sub-Pixel Electrode Reflection Layout for Accurate LED Transfer
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Solution Overview
Problem
During the transfer process of light emitting devices in display devices, errors occur due to incorrect positioning, which affects the efficiency and accuracy of the manufacturing process.
Innovation Solution
The display device incorporates a substrate with a matrix structure of sub-pixels, where the widths of reflection areas in the first electrodes of each sub-pixel differ, and the widths of these reflection areas vary gradually across different display areas, guiding the precise placement of light emitting devices during transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting devices are transferred using a conventional uniform electrode design, then the manufacturing process is simple, but positioning accuracy deteriorates due to transfer errors
Solution Approach 1:
The first electrode is designed with different width regions (first width in the first sub-pixel region, second width in the second sub-pixel region) to provide localized quality variations. This allows the electrode structure to offer different characteristics in different areas, improving positioning accuracy during transfer while maintaining overall structural feasibility.
Solution Approach 2:
The first electrode is segmented into multiple width regions along the first direction, with each region having a specific width tailored to its corresponding sub-pixel region. This segmentation enables precise control over light emitting device positioning in different areas of the display panel.
2Manufacturing precision
If the electrode width is increased to improve positioning accuracy, then transfer precision improves, but the area occupied by the electrode increases
Solution Approach 1:
Instead of uniformly increasing the electrode width across the entire display panel, the invention applies increased width only in specific sub-pixel regions where positioning accuracy is most critical. The first width and second width are selectively applied to different sub-pixel regions, optimizing transfer precision where needed while minimizing overall electrode area occupation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design reduces errors in the transfer process, enhancing the accuracy and efficiency of light emitting device placement, thereby improving the overall performance and reliability of the display device.
Implementation Method 1
a first electrode disposed on the bank and including a central area, an edge area, and a reflection area between the central area and the edge area
Data Source
AI summary
A display device is provided with, a substrate, a display area and a non-display area, a pixel driving circuit in the display area on the substrate, an insulating layer on the pixel driving circuit, a bank disposed in a plurality of sub-pixels including a first sub-pixel and a second sub-pixel on the insulating layer, a first electrode disposed on the bank and including a central area, an edge area, and a reflection area between the central area and the edge area, and a light emitting device electrically connected to the first electrode on the first electrode and overlapping the bank. A width of a reflection area of the first electrode in the first sub-pixel is different from a width of a reflection area of the first electrode in the second sub-pixel.