Perovskite Light Conversion Layer Patterning for Display Contrast
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Solution Overview
Problem
Conventional display panels experience decreased contrast due to non-pixel effective light emitting areas contributing to increased dark state brightness when illuminated.
Innovation Solution
A display panel and fabricating method utilizing a perovskite structural material with a chemical formula ABX3, where A and B are inorganic elements and X is a halogen, forming a light conversion layer with patterning by an antisolvent method to align light conversion patterns with pixel units, reducing light emission from non-pixel areas through low-temperature vacuum drying and inkjet printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a light conversion layer is formed on the whole surface of the backlight module, then light conversion efficiency is improved, but dark state brightness increases and contrast decreases
Solution Approach 1:
The light conversion layer is segmented into multiple light conversion patterns corresponding to different color regions (red, green, blue). Each pattern is positioned only where needed for color conversion, leaving non-pixel areas without light conversion material. This segmentation allows the light conversion layer to maintain high conversion efficiency in pixel areas while preventing unwanted light emission in non-pixel areas, thus solving the contrast problem.
Solution Approach 2:
Different regions of the light conversion layer are assigned different properties: pixel effective areas contain light conversion patterns for color conversion, while non-pixel areas are left empty or filled with black matrix material. This local differentiation ensures that light conversion occurs only where required for display functionality, eliminating the harmful effect of light emission in non-pixel areas and improving overall contrast.
2Ease of manufacture
If perovskite precursor solution is coated on the substrate, then light conversion layer formation is achieved, but non-pixel areas also emit light causing contrast reduction
Solution Approach 1:
A patterned organic functional layer is formed beforehand on the substrate before coating the perovskite precursor solution. This preliminary patterning creates a template that guides the subsequent perovskite deposition, ensuring that the light conversion patterns are formed only in the desired pixel areas. The patterned organic layer acts as a mask or guide layer that prevents perovskite formation in non-pixel areas, thereby eliminating unwanted light emission while maintaining ease of manufacture through sequential processing.
Solution Approach 2:
A patterned organic functional layer is introduced as an intermediary between the substrate and the perovskite light conversion layer. This intermediary layer is formed first with specific patterns, then the perovskite precursor solution is coated over it. The organic layer mediates the formation process by providing a structured interface that directs perovskite deposition only in appropriate regions, preventing non-pixel light emission while maintaining simple coating processes.
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
The method effectively reduces dark state brightness and enhances contrast by ensuring only light passing through designated patterns reaches pixel units, thereby minimizing unwanted light emission.
Implementation Method 1
performing a low-temperature vacuum drying treatment on the perovskite precursor solution to form the light conversion layer on the substrate
Implementation Method 2
inkjet printing the antisolvent at the positions of the plurality of light conversion patterns
Data Source
AI summary
A display panel and a fabricating method thereof are provided. The fabricating method of the display panel has steps of: providing a substrate; forming a light conversion layer on the substrate, wherein material of the light conversion layer has a perovskite structural material with a chemical formula of ABX3, wherein A represents an inorganic element, B represents an inorganic element, and X represents a halogen; performing a patterning step on the light conversion layer by an antisolvent method, wherein the light conversion layer forms a plurality of light conversion patterns; and forming a pixel layer on the light conversion layer, wherein the pixel layer has a plurality of pixel units, and the plurality of pixel units are respectively aligned with the plurality of light conversion patterns. The fabricating method can reduce a dark state brightness of the display panel, thereby improving contrast of the display panel.