Micro-LED Pixel Array Patterning With Reflective Barriers for 2000+ PPI
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Solution Overview
Problem
Current OLED display manufacturing technologies face a physical bottleneck when achieving high Pixels Per Inch (PPI) greater than 800, limiting the realization of high PPI and colorful displays.
Innovation Solution
A method involving the formation of a reflective array between two adjacent quantum dots to prevent optical crosstalk, using a driving backplane and light-emitting substrate bonded with metal layers, patterning with yellow light and etching processes, and forming quantum dots and a reflective array to achieve high-definition displays with PPI exceeding 2000.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional OLED evaporation method is used, then manufacturing process is simple, but PPI cannot exceed 800 due to physical bottleneck
Solution Approach 1:
The patent replaces the traditional mechanical evaporation method with a wet chemical etching process using yellow light and photoresist patterns. This substitution enables higher PPI (exceeding 2000) by allowing more precise patterning through chemical means rather than physical vapor deposition, thereby breaking the 800 PPI bottleneck while maintaining manufacturing feasibility
Solution Approach 2:
The patent changes the fundamental manufacturing parameter from vacuum evaporation to wet chemical etching with photoresist. This parameter change enables sub-800 PPI resolution by allowing finer feature definition through the photoresist pattern transfer process, achieving over 2000 PPI display resolution
2Manufacturing precision
If quantum dots are placed close together to increase PPI, then display resolution improves, but optical crosstalk between adjacent quantum dots increases
Solution Approach 1:
The patent introduces a reflective array structure as an intermediary element positioned between adjacent quantum dots. This reflective array acts as a optical barrier that prevents light from one quantum dot from reaching adjacent quantum dots, thereby eliminating optical crosstalk while maintaining the high PPI configuration with closely spaced quantum dots
Solution Approach 2:
The patent segments the space between quantum dots by introducing the reflective array structure. This segmentation divides the optical path into isolated regions, preventing light leakage and crosstalk between adjacent quantum dots while maintaining high display resolution
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 method breaks through the physical limitations of traditional technologies, enabling high-precision patterning and achieving displays with PPI of 2000 and higher, preventing optical crosstalk and allowing for high-definition, multi-color displays.
Implementation Method 1
forming a reflective array between two adjacent quantum dots to avoid optical crosstalk between the pixel arrays
Implementation Method 2
forming quantum dots on top of the thin film packaging layer to form a multi-color display
Data Source
AI summary
The present invention provides a display panel and manufacturing method thereof, the method including following steps: providing a driving backplane and a light-emitting substrate, and bonding the driving backplane and the light-emitting substrate; patterning the light-emitting substrate to form a pixel array; forming a thin film packaging layer on an outside of the pixel array, the thin film packaging layer completely covering the pixel array; forming quantum dots on top of the thin film packaging layer to form a multi-color display; forming a reflective array between two adjacent quantum dots to avoid optical crosstalk between the pixel arrays. The display panel and the method of the present invention break through the physical limit of the high PPI, high-precision metal mask, which can realize the display of 2000 and higher PPI, and can prevent the optical crosstalk between the pixel arrays.