Switchable Refractive-Index Layer for OLED Blue Light Filtering
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Solution Overview
Problem
OLED devices emit harmful blue light that can cause vision problems and visual fatigue, and existing solutions do not adequately address this issue.
Innovation Solution
An anti-blue light device with refractive index adjustment layers, comprising a first and second film layer, whose refractive index can be adjusted by driving signals to either transmit or reflect harmful blue light, reducing its intensity in the emitted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fixed refractive index structure is used, then the device structure is simple, but it cannot dynamically adjust to reduce harmful blue light while maintaining normal light transmission
Solution Approach 1:
The patent applies the dynamics principle by using a liquid crystal layer whose refractive index can be dynamically adjusted through voltage control. The liquid crystal layer transitions between different refractive index states (first refractive index and second refractive index) based on applied voltage, enabling dynamic optimization of blue light filtering without permanently complicating the device structure. This allows the system to adapt its optical properties in real-time based on operational requirements.
Solution Approach 2:
The patent implements parameter changes by modifying the refractive index of the liquid crystal layer through voltage application. By changing the refractive index parameter of the second film layer between two distinct values, the device can control the transmission and reflection characteristics of blue light wavelengths. This parameter adjustment enables the system to optimize optical performance without requiring structural modifications.
2Illumination intensity
If the refractive index difference between film layers is small, then normal light transmission is maintained, but harmful blue light cannot be effectively reflected
Solution Approach 1:
The patent uses the dynamics principle to enable the liquid crystal layer to switch between two refractive index states. In the first state (first refractive index), the refractive index difference with the first film layer is small, allowing normal light transmission. In the second state (second refractive index), the refractive index difference is large, enabling effective blue light reflection. This dynamic switching resolves the contradiction by allowing the system to optimize for either transmission or reflection based on operational needs.
Solution Approach 2:
The patent applies parameter changes by adjusting the refractive index of the liquid crystal layer between two distinct values. When the refractive index is set to the first value, normal light transmission is prioritized. When changed to the second value, blue light reflection is enhanced. This parameter adjustment mechanism allows the device to dynamically balance between transmission and reflection requirements.
3Object-affected harmful factors
If multiple refractive index adjustment layers are added, then blue light filtering effectiveness is improved, but the device thickness and complexity increase
Solution Approach 1:
The patent applies the dynamics principle by using a single liquid crystal layer that can dynamically adjust its refractive index, replacing the need for multiple static refractive index adjustment layers. This dynamic approach achieves effective blue light filtering through refractive index modulation rather than through increased layer count, thereby avoiding the thickness penalty that would result from adding multiple physical layers.
Solution Approach 2:
The patent implements parameter changes by modifying the refractive index of the liquid crystal layer to achieve blue light filtering effectiveness. Instead of adding multiple layers with fixed refractive indices, the system uses a single layer whose refractive index parameter is adjusted to control blue light reflection. This parameter-based approach maintains device thickness while achieving the desired filtering performance.
Data Source
AI summary
An anti-blue light device, a light-emitting device and a display apparatus are provided by the present disclosure, which relates to the technical field of displaying. The anti-blue light device includes: at least one refractive index adjustment layer arranged in layer configuration, wherein the refractive index adjustment layer includes a first film layer and a second film layer arranged in layer configuration; the first film layer is disposed adjacent to a light incident surface of the anti-blue light device, and a refractive index of the second film layer is adjustable under an action of a driving signal; in a first mode, an absolute value of a difference between a refractive index of the first film layer and the refractive index of the second film layer is less than or equal to a first threshold; and in a second mode, the difference between the refractive index of the second film layer and the refractive index of the first film layer is greater than or equal to a second threshold, and the second threshold is greater than the first threshold.