Dichroic Reflection Layer with Recessed Portions for Quantum Dot Light Control
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Solution Overview
Problem
Liquid crystal display devices face limitations in chromatic purity and color gamut span, and quantum dot light-emitting technologies suffer from light leakage due to 360-degree divergence, leading to degraded display quality and inefficient light emission at specific angles.
Innovation Solution
A display device incorporating a first chromatic light source, a dichroic reflection layer with recessed portions, and a quantum dot layer, where the dichroic reflection layer allows specific chromatic light to pass through and reflect light emitted by quantum dot blocks, centralizing it towards a particular angle, thereby reducing light leakage and enhancing light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are used for light emission, then chromatic purity and color gamut span are improved, but light leakage occurs due to 360-degree divergence
Solution Approach 1:
The patent introduces a dichroic reflection layer with a curved reflective surface (convex toward the quantum dot layer) that reflects divergent light from quantum dots. The curved surface geometry redirects light rays that would otherwise leak laterally, concentrating them toward the front viewing angle and improving both chromatic purity and reducing light leakage.
Solution Approach 2:
The dichroic reflection layer acts as an intermediary component between the quantum dot layer and the viewing environment. It selectively transmits excitation light while reflecting emitted chromatic light, mediating the light paths to achieve both high chromatic purity and reduced light leakage through its optical filtering and geometric reflection properties.
2Adaptability or versatility
If quantum dots emit light in 360 degrees, then light emission coverage is improved, but light emission efficiency at particular angles deteriorates
Solution Approach 1:
The convex curved reflective surface of the dichroic reflection layer is designed to redirect light from all emission angles toward the front viewing angle. The geometric configuration ensures that light emitted at various angles is reflected convergently, concentrating intensity at the target angle while preserving broad emission coverage.
Solution Approach 2:
The patent uses the curved surface geometry to transform the angular distribution of light in three-dimensional space, redirecting light rays from multiple angular dimensions toward a specific viewing direction, thereby improving light emission efficiency at particular angles without sacrificing overall coverage.
3Illumination intensity
If a dichroic reflection layer with recessed portions is introduced, then light emission efficiency at particular angle is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into the dichroic reflection layer: it serves as both an optical filter (transmitting excitation light, reflecting emitted light) and a light redirecting element (with convex curved surface). This merging of functions achieves improved light emission efficiency without adding separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The dichroic reflection layer's curved surface geometry and optical properties are optimized through parameter adjustments (curvature radius, layer thickness, material composition) to achieve the desired light concentration effect. By tuning these parameters, the patent improves light emission efficiency while keeping the structural complexity manageable through a single integrated layer rather than multiple discrete components.
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 improves light emission intensity at specific angles, reduces light leakage, and enhances display quality and light emission efficiency, providing better chromatic purity and color gamut span.
Implementation Method 1
chromatic light emitted by the quantum dot blocks corresponding to the recessed portions may be reflected by the dichroic reflection layer at the recessed portion
Implementation Method 2
quantum dot light-emitting technologies
Data Source
AI summary
The present invention provides a display device, including: a first chromatic light source configured to generate first chromatic light, a dichroic reflection layer disposed on a light emergent side of the first chromatic light source and allowing the first chromatic light to pass through, and a quantum dot layer. The dichroic reflection layer has a first surface facing away from the first chromatic light source, and the first surface has a plurality of recessed portions. The quantum dot layer includes a plurality of quantum dot blocks, and the quantum dot blocks are disposed corresponding to the recessed portions.