PDLC Display Device with Quantum Dots and Black Matrix
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Solution Overview
Problem
Conventional PDLC display devices suffer from light leakage and color mixture issues, which affect their performance and manufacturing efficiency.
Innovation Solution
A method is developed that combines polymer dispersed liquid crystal (PDLC) with quantum dots (QDs) to form a display device, where a black matrix and base plates delimit pixel cavities, filled with specific mixtures of PDLC and QDs, and a blue-light backlight module is used to eliminate light leakage and color mixture, eliminating the need for alignment layers and polarizers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional PDLC display device structure is used, then manufacturing process is simple, but light leakage and color mixture occur
Solution Approach 1:
The patent combines PDLC material with quantum dots to create a composite display device structure. The quantum dots are integrated into the PDLC layer, forming a composite material system that simultaneously achieves the light switching function of PDLC and the color purification function of quantum dots, thereby eliminating light leakage and color mixture while maintaining manufacturing simplicity
Solution Approach 2:
The patent introduces a black matrix structure with specific aperture ratios at the boundaries of pixel cavities. This local structural modification creates light-blocking barriers at critical areas where light leakage occurs, while the rest of the display area maintains the simple PDLC structure for easy manufacturing
2Reliability
If alignment layers and polarizers are added to eliminate light leakage, then display performance improves, but manufacturing complexity and cost increase
Solution Approach 1:
The patent removes the need for alignment layers and polarizers by extracting their light-control functions and implementing them through alternative mechanisms: quantum dots for color control and black matrix structures for light leakage prevention. This simplifies the overall device structure while maintaining display performance
Solution Approach 2:
The patent changes the approach from using optical anisotropy (polarizers and alignment layers) to using quantum confinement effects (quantum dots) and geometric light blocking (black matrix). This parameter change in the light control mechanism eliminates complex layers while achieving the same light leakage prevention goal
3Reliability
If quantum dots are combined with PDLC, then light leakage and color mixture are eliminated, but manufacturing process complexity increases
Solution Approach 1:
The patent merges the quantum dot incorporation process with the existing PDLC manufacturing process. Quantum dots are mixed into the PDLC material before injection into pixel cavities, combining two material preparation steps into one integrated process that eliminates light leakage and color mixture without significantly increasing manufacturing complexity
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 enhances manufacturing efficiency and reduces costs by eliminating light leakage and color mixture, enabling at least four displaying modes (red, green, blue, and indistinctness) without requiring alignment layers or polarizers.
Implementation Method 1
quantum dots are classified as two types according to the ways of energy acquisition, one being photoluminescence
Implementation Method 2
Incident light would be strongly scattered so that the film shows an opaque or translucent condition
Implementation Method 3
When an external voltage is applied, the optical axes of the liquid crystal drops are aligned in a direction normal to a surface of the film, meaning being consistent with the direction of the electric field
Data Source
AI summary
The present invention provides a method for manufacturing a PDLC display device and a PDLC display device. The method for manufacturing a PDLC display device according to the present invention provides a black matrix and a base plate that collectively delimit a plurality of pixel cavities and fills a mixture of PDLC and red QDs, a mixture of PDLC and green QDs, and PDLC respectively into the plurality of pixel cavities to form a PDLC substrate, which is laminated with an array substrate, and installed with a blue light backlight module, so as to form a PDLC display device. Light leakage and color mixture can be eliminated and processes related to alignment layers and polarizers can be saved to thereby increase the manufacturing efficiency and lower the manufacturing cost. The PDLC display device according the present invention is manufactured with the above-described method and demonstrates at least four displaying modes of red, green, blue, and indistinctness, allowing for use in applications where unique effects are required, and helping eliminate light leakage and color mixture and also requiring no alignment layer and polarizer so that the manufacturing efficiency is high and the manufacturing cost is low.