Micro-LED UV Filter Structure for Blocking Unabsorbed Blue Light
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Solution Overview
Problem
High-resolution LED displays that combine micro-light-emitting diodes (μLEDs) with photoluminescent materials like quantum dots face challenges in preventing the transmission of unabsorbed blue or UV light, which can be harmful to viewers and are not effectively addressed by conventional strategies.
Innovation Solution
Incorporating a UV light filter over the photoluminescent region in the LED structure, which is designed to transmit light with wavelengths greater than 430 nm while absorbing light with wavelengths less than 430 nm, thereby reducing the amount of blue or UV light that escapes the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional LED displays use organic or inorganic compounds to emit light of particular colors, then the number of filters required is reduced, but harmful light can escape the display and reach users
Solution Approach 1:
A UV light filter layer is introduced as an intermediary component between the photoluminescent region and the user. This filter selectively blocks harmful UV and blue light wavelengths while allowing visible light to pass through, thereby protecting users without interfering with the display's color emission functionality
Solution Approach 2:
The UV light filter is positioned specifically above the photoluminescent region where harmful light is generated, applying the filtering function locally at the source of the problem rather than throughout the entire display structure
2Object-affected harmful factors
If filters are added to block harmful light, then user safety is improved, but display brightness and power efficiency may be reduced
Solution Approach 1:
The UV light filter is designed with specific optical parameters that allow it to block harmful wavelengths (UV and blue light below 450nm) while maintaining high transmittance for visible light wavelengths that contribute to display brightness, thus minimizing the impact on overall display luminosity
3Measurement precision
If photoluminescent materials are used to convert light colors, then color accuracy is improved, but variations in emission characteristics make consistent color gamut difficult to achieve
Solution Approach 1:
The patent employs color conversion layers with carefully selected photoluminescent materials that have been characterized for their emission properties. By selecting materials with complementary emission spectra and optimizing their thickness and composition, the system achieves feedback control over the overall color output, compensating for variations in individual material characteristics
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 UV light filter effectively reduces the transmission of harmful blue or UV light, enhancing the safety and performance of high-pixel density displays by maintaining accurate color gamut and brightness while preventing harmful light from reaching the viewer.
Implementation Method 1
The UV light filter may be operable to transmit light generated by the light emitting diode structure characterized by an emission wavelength of less than or about 430 nm
Implementation Method 2
Exemplary photoluminescent materials may include quantum dots
Data Source
AI summary
Exemplary device structures may include a light emitting diode structure. The light emitting diode structure may be operable to generate light. The structures may include a photoluminescent region containing a photoluminescent material. The photoluminescent region may be positioned on the light emitting diode structure. The structures may include an ultraviolet (UV) light filter positioned above the photoluminescent region. The UV light filter may be operable to absorb light generated by the light emitting diode structure characterized by an emission wavelength of less than or about 430 nm.