Display Device Light Attenuation Unit Blue Light Reduction
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Solution Overview
Problem
Existing display devices emit short-wavelength blue light, which is harmful to human eyes due to its high energy, and current technologies fail to effectively reduce its transmission without affecting other colors.
Innovation Solution
A display device incorporating a light attenuation unit with alternately arranged layers of different refractive indices, specifically designed to reduce the transmittance of short-wavelength blue light by employing a structure such as (H2L2)m or (L2H2)m, where H and L represent layers with optical thicknesses of λ/4 and λ/8 respectively, to minimize blue light emission while maintaining other color transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light attenuation unit with alternately arranged layers of different refractive indices is introduced, then the transmittance of short-wavelength blue light is reduced, but the device complexity increases
Solution Approach 1:
The light attenuation unit is segmented into multiple thin layers (first layer, second layer, third layer, fourth layer) with alternating refractive indices. Each layer has a specific optical thickness (λ/4 or λ/8) that contributes to the overall blue light attenuation effect through cumulative interference and reflection, achieving effective blue light blocking while maintaining a relatively simple layered structure
Solution Approach 2:
The patent employs composite material structure by combining layers with different refractive indices (e.g., high refractive index layer with n1 and low refractive index layer with n2 where n1 > n2). This composite layered approach creates multiple interfaces that collectively attenuate short-wavelength blue light through interference and reflection effects, achieving selective wavelength filtering
2Object-affected harmful factors
If the optical thickness of layers is optimized for blue light attenuation, then blue light transmittance is reduced, but the brightness of other colors may be affected
Solution Approach 1:
The light attenuation unit exhibits local quality by being positioned specifically at the blue sub-pixel region of the display panel rather than uniformly across the entire display. This localized placement ensures that blue light attenuation is applied only where needed, while red and green sub-pixels maintain their full brightness and color accuracy
Solution Approach 2:
The patent optimizes the optical thickness parameter of each layer (setting to λ/4 or λ/8 where λ is the wavelength of blue light) to create constructive interference for blue light attenuation while maintaining transparency for other wavelengths. By carefully selecting these parameter values, the system achieves selective wavelength filtering without significantly impacting overall display brightness
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 reduces the intensity of short-wavelength blue light emission, thereby protecting human eyes while preserving the brightness and color accuracy of the display device.
Implementation Method 1
the light attenuation unit comprises at least one first layer and at least one second layer which are alternately provided, the first layer having a refractive index greater than a refractive index of the second layer, and the light attenuation unit is configured to reduce a transmittance of the short-wavelength blue light among incident light
Implementation Method 2
the light attenuation unit is configured to reduce a transmittance of the short-wavelength blue light among incident light
Data Source
AI summary
The present disclosure provides a display device, belonging to a field of display technology, and can address a problem in an existing display device that short-wavelength blue light causes harm to human eyes. The display device includes a light attenuation unit, wherein the light attenuation unit comprises at least one first layer and at least one second layer which are alternately provided, the first layer having a refractive index greater than a refractive index of the second layer, and the light attenuation unit is configured to reduce a transmittance of the short-wavelength blue light among incident light.