OLED Subpixel Deposition via Segmented Hole Injection Layers
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Solution Overview
Problem
Current processes for producing full-color organic light-emitting diodes (OLEDs) require modifications to deposit different organic polymeric materials on a single substrate, complicating the manufacturing of multicolor displays.
Innovation Solution
A process involving the application of a hole injection layer with a conductive polymer and fluorinated acid polymer, followed by a hole transport layer, and specific electroluminescent materials for red, green, and blue subpixels, where the electroluminescent materials are selected to emit distinct colors, ensuring efficient color emission across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different organic polymeric materials are deposited on a single substrate to produce full-color OLEDs, then color display capability is improved, but manufacturing process complexity increases
Solution Approach 1:
The electroluminescent layer is segmented into distinct red, green, and blue subpixel areas, each containing specific electroluminescent materials. This segmentation allows each subpixel to emit its primary color independently, enabling full-color display capability while using a unified deposition process for all materials
Solution Approach 2:
The patent employs a universal deposition process that can handle multiple different organic polymeric materials (red, green, and blue electroluminescent materials) using the same equipment and methodology. This multi-functional approach eliminates the need for separate specialized processes for each material type, reducing manufacturing complexity
2Illumination intensity
If multiple electroluminescent materials are applied to different subpixel areas, then color emission quality is improved, but material deposition difficulty increases
Solution Approach 1:
Different electroluminescent materials are selectively applied to specific subpixel areas (red materials to red subpixels, green to green, blue to blue) to optimize color emission quality for each region. The local quality principle ensures each subpixel contains only the materials needed for its specific color function
Solution Approach 2:
The patent uses spin-coating deposition, a copying process where a uniform coating is applied across the entire substrate simultaneously. This method copies the same deposition procedure across all subpixel areas, making the process easy to manufacture while still achieving different material distributions through pre-patterned substrates or masks
Data Source
AI summary
There is provided a new process for forming a light-emitting diode device having first, second, and third subpixel areas. In the process a hole injection layer is applied over an anode layer. The hole injection material has a conductive polymer and a fluorinated acid polymer. A hole transport layer is applied over the hole injection layer. A first electroluminescent material which is either green or blue, is applied to the first subpixel areas. A second electroluminescent material which is either blue or green, is applied to the second subpixel areas. A red electroluminescent material is applied overall, followed by deposition of a cathode. The second electroluminescent material emits a color different from that of the first electroluminescent material.