Responsive Photonic Crystal Light Adjusting Layer for Blue Light Filtering
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Solution Overview
Problem
Conventional blue light filters on display devices reduce overall brightness and color gamut, requiring users to repeatedly attach and detach filters to switch between eye protection and normal display modes, which is inconvenient.
Innovation Solution
A display device with a light adjusting layer containing a responsive photonic crystal that blocks blue light within a specific wavelength range when an external stimulus is applied, allowing blue light to pass through when the stimulus is removed, enabling seamless switching between eye protection and normal display modes without affecting other color wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a blue light filter is attached to the display panel, then harmful blue light is blocked, but overall brightness and color gamut are reduced
Solution Approach 1:
The photonic crystal structure is designed to selectively block only specific wavelength ranges (blue light at 420-450nm) while allowing other wavelengths to pass through. This local quality approach targets the harmful blue light portion specifically without affecting the overall brightness and color gamut of the display, resolving the contradiction between blue light blocking and brightness maintenance
Solution Approach 2:
The patent utilizes the optical properties of photonic crystals that can selectively reflect or transmit different wavelengths of light. By engineering the lattice structure to target blue light wavelengths specifically, the system achieves wavelength-selective filtering that blocks harmful blue light while maintaining transmission of other visible light wavelengths, thus preserving overall brightness
2Object-affected harmful factors
If a blue light filter film is attached to protect eyes, then blue light is blocked, but users must repeatedly attach and detach the film to switch between eye protection and normal display modes
Solution Approach 1:
The patent implements a dynamically controllable blue light filtering system using photonic crystals whose optical properties can be changed in real-time. By applying external stimuli such as voltage, temperature, or light, the photonic crystal structure can dynamically adjust its light transmission characteristics, enabling seamless switching between eye protection mode (blue light blocked) and normal display mode (blue light transmitted) without physical attachment or detachment of filter films
Solution Approach 2:
The system can automatically adjust its blue light filtering state based on environmental conditions or usage patterns. The photonic crystal structure responds to external stimuli autonomously, allowing the display device to self-regulate between eye protection and normal display modes without requiring manual intervention from users to attach or detach filter films
3Object-affected harmful factors
If a conventional blue light filter is used, then blue light is blocked, but the filter blocks all light wavelengths including beneficial visible light
Solution Approach 1:
The photonic crystal structure is engineered with specific lattice parameters that create a photonic bandgap only for harmful blue light wavelengths (420-450nm). This local quality design allows the filter to selectively block blue light while maintaining high transmission for other visible light wavelengths, thus preserving the quantity of beneficial visible light that reaches the display panel and ultimately the user's eyes
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 allows for convenient switching between eye protection and normal display modes by applying or removing an external stimulus to the light adjusting layer, maintaining high brightness and color gamut in normal mode while filtering harmful blue light in eye protection mode.
Implementation Method 1
the light adjusting layer includes a responsive photonic crystal
Implementation Method 2
electrolyte in the electrolyte layer flows into the electroactive layer to cause that a lattice parameter of the photonic crystal in the electroactive layer is changed, and the photonic crystal blocks the light having the wavelength in the partial wavelength range of blue light from passing through
Implementation Method 3
an electric field is formed between the first electrode and the second electrode in response to different voltages being applied to the first electrode and the second electrode; and the electrolyte layer and the electroactive layer are configured such that electrolyte in the electrolyte layer flows into the electroactive layer
Implementation Method 4
the light emitting device is configured to generate and emit light having a wavelength in a wavelength range of visible light
Data Source
AI summary
The present disclosure provides a display device, including: a light emitting device and a light adjusting layer, the light adjusting layer being on a light emitting side of the light emitting device, and the light emitting device being configured to generate and emit light having a wavelength in a wavelength range of visible light, wherein the light adjusting layer is configured to block light having a wavelength in a partial wavelength range of blue light from passing through when subjected to an external stimulus and allow the light having the wavelength in the partial wavelength range of blue light to pass through when the external stimulus is removed, and the light adjusting layer includes a responsive photonic crystal.