Counter Substrate Lens Layer for Quantum Dot Display Light Management
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Solution Overview
Problem
Current display technologies face challenges in preventing cross-contamination of light between adjacent subpixels, leading to reduced color accuracy and efficiency in quantum dot-based displays.
Innovation Solution
A counter substrate is designed with a bank layer, a quantum dots material layer, and a lens or reflective coating layer, where the lens layer is positioned in the inter-subpixel region to converge and absorb or reflect light, preventing cross-contamination, and the reflective coating layer is applied on the lens portions to enhance light management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional display structure without specialized light management layers is used, then the device complexity is reduced, but cross-contamination of light between adjacent subpixels occurs leading to reduced color accuracy
Solution Approach 1:
The patent introduces a lens layer and reflective coating layer as intermediary structures between the quantum dots material layer and the external environment. These layers act as mediators to manage light propagation, converging light from quantum dots and reflecting stray light back to prevent cross-contamination between subpixels, thereby improving color accuracy without fundamentally changing the core display structure
Solution Approach 2:
The light management function is segmented into distinct components: a lens layer with multiple lens portions, each corresponding to specific subpixel regions, and a reflective coating layer with reflective portions. This segmentation allows independent optimization of light convergence and reflection functions, achieving precise light control to prevent cross-contamination while maintaining structural clarity
2Measurement precision
If light management layers (lens and reflective coating) are added to prevent cross-contamination, then color purity is improved, but energy loss increases due to additional light interaction interfaces
Solution Approach 1:
The patent converts potentially harmful stray light that would cause cross-contamination into beneficial reflected light by using the reflective coating layer. Stray light that escapes the lens portions is reflected back through the lens layers, converting energy loss into useful light contribution, thereby maintaining color purity while reducing net energy loss
Solution Approach 2:
The light management system uses composite material structures: the lens layer is formed with materials having specific refractive indices, and the reflective coating layer uses materials with high reflectivity. This composite approach optimizes light convergence and reflection efficiency, minimizing energy loss while achieving superior color purity through coordinated material properties
3Reliability
If lens portions and reflective portions are precisely positioned adjacent to bank aperture peripheries, then cross-contamination prevention is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The lens layer and reflective coating layer are designed with multi-functionality: lens portions serve both as light convergence elements and as positioning references for reflective portions. The overlapping projection relationship between lens and bank layers creates a universal structural framework that simultaneously achieves light management and precise positioning, reducing the need for separate positioning mechanisms
4Reliability
If the lens layer is disposed throughout the inter-subpixel region, then light management coverage is maximized, but the area occupied by light management structures increases
Solution Approach 1:
The patent applies local quality by positioning lens portions and reflective portions specifically in regions where they are most needed - adjacent to bank aperture peripheries in inter-subpixel regions. The lens layer is disposed throughout the inter-subpixel region where light management is critical, while minimizing intrusion into subpixel active areas, achieving optimal light management coverage with minimal 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
The solution effectively prevents cross-contamination of light between subpixels, enhancing energy utilization and color purity, thereby improving the overall performance and efficiency of quantum dot-based displays.
Implementation Method 1
a lens layer on a side of the quantum dots material layer and the bank layer away from the base substrate, wherein the lens layer includes one or more lens portions, orthographic projections of which on the base substrate are adjacent to a periphery of an orthographic projection of a respective one of the plurality of bank apertures on the base substrate
Implementation Method 2
a reflective coating layer on a side of the lens layer away from the base substrate, wherein the reflective coating layer includes one or more reflective portions respectively coated on surfaces of the one or more lens portions
Implementation Method 3
Quantum dots have unique photoluminescence and electroluminescence properties due to quantum size effects and dielectric confinement effects
Implementation Method 4
Quantum dots have unique photoluminescence and electroluminescence properties due to quantum size effects and dielectric confinement effects
Data Source
AI summary
A counter substrate is provided. The counter substrate includes a bank layer on a base substrate and defining a plurality of bank apertures; a quantum dots material layer on the base substrate, the quantum dots material layer including a plurality of quantum dots blocks respectively in at least some of the plurality of bank apertures; and a support layer on a side of the quantum dots material layer and the bank layer away from the base substrate. The support layer includes one or more support portions, orthographic projections of which on the base substrate adjacent to a periphery of an orthographic projection of a respective one of the plurality of bank apertures on the base substrate. An orthographic projection of the bank layer on the base substrate at least partially overlaps with an orthographic projection of the support layer on the base substrate.