Quantum Dot Display Electro-Fluidic Shutter Ambient Light Contrast
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Solution Overview
Problem
Quantum dot display devices suffer from reduced contrast due to ambient light excitation, which affects their display performance even in dark states, as the ambient light causes unwanted emission from quantum dots.
Innovation Solution
An electro-fluidic shutter is integrated into the quantum dot display device, comprising immiscible conductive and non-conductive fluids with the conductive fluid having light transmittance and the non-conductive fluid having light absorption properties, allowing light to pass through when voltage is applied and absorbing ambient light when not, thereby reducing light leakage and improving contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are used as a light conversion layer, then color saturation and light-emitting spectrum are improved, but display contrast is worsened due to ambient light excitation
Solution Approach 1:
An electro-fluidic shutter is introduced as an intermediary component between the quantum dot light conversion layer and the ambient environment. The shutter contains conductive and non-conductive fluids that can be electrically controlled to block or permit light passage, thereby mediating the harmful interaction between ambient light and quantum dots while preserving the desired optical performance
2Object-affected harmful factors
If an electro-fluidic shutter is added to block ambient light, then display contrast is improved, but device complexity increases
Solution Approach 1:
The electro-fluidic shutter utilizes hydraulic principles by employing immiscible conductive and non-conductive fluids within the shutter cavity. Electric fields applied to these fluids enable control over light transmission without requiring complex mechanical moving parts, thus achieving effective light blocking while maintaining relatively simple device architecture
Solution Approach 2:
The shutter operates by changing the electrical parameters (applying or removing voltage) to alter the optical properties of the fluid system. When voltage is applied, the conductive fluid redistributes to block light paths; when voltage is removed, the system returns to a light-permissive state, enabling dynamic control through simple parameter modulation
Data Source
AI summary
The present invention provides a quantum dot display device and a manufacturing method thereof. The quantum dot display device includes a base substrate, a backlight, a color conversion layer disposed on a side of the backlight away from the base substrate, and an electro-fluidic shutter disposed on a side of the color conversion layer away from the backlight. The electro-fluidic shutter includes a plurality of shutter units, and a sealing portion is disposed between adjacent shutter units. Contrast of the quantum dot display device under strong ambient light is improved, which is beneficial for application in outdoor advertising displays and the like.