Filter Conversion Layer Corrects Microcavity Blue Shift
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Solution Overview
Problem
The silicon-based OLED microdisplay experiences low brightness, limiting its application in VR, AR, and MR technologies, and the strong microcavity effect causes blue shift in emission peak, leading to visual color cast issues due to chromaticity deviations.
Innovation Solution
A display substrate with a filter conversion layer containing light conversion materials like perovskite quantum dots that absorb light below a preset wavelength range and convert it to the desired range, correcting the emission spectrum shift and reducing visual color cast by incorporating optical filter materials and WOLED devices with microcavity adjustment layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a microcavity structure is used to enhance light emission, then brightness is improved, but blue shift occurs causing chromaticity deviation and visual color cast
Solution Approach 1:
A filter conversion layer is introduced as an intermediary component between the WOLED and the external environment. This layer contains light conversion materials that absorb the blue-shifted light and convert it to the correct wavelength, mediating between the microcavity's enhanced emission and the required chromaticity accuracy
Solution Approach 2:
The patent changes the optical parameters of the system by introducing materials with specific absorption and emission characteristics. The light conversion materials have tailored absorption spectra that match the blue-shifted emission, converting it to the desired wavelength range and correcting the chromaticity
2Manufacturing precision
If light conversion materials are added to correct emission spectrum, then chromaticity accuracy is improved, but device structure becomes more complex
Solution Approach 1:
The filter conversion layer combines multiple functions into a single integrated component: it serves as both a light conversion medium and a chromaticity correction filter. The light conversion materials are embedded within a filter matrix, merging the conversion and filtering functions in one layer
Solution Approach 2:
The filter conversion layer performs multiple functions simultaneously: it converts light wavelength, filters unwanted wavelengths, and corrects chromaticity. This multi-functional design reduces the need for separate components and simplifies the overall device structure
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
Enhances brightness and reduces visual color cast by stabilizing the emission spectrum across viewing angles, improving the display effect by correcting the blue shift caused by the microcavity effect.
Implementation Method 1
The filter conversion layer includes a light conversion material capable of absorbing light with a wavelength less than a preset wavelength range and converting the absorbed light into light with a wavelength in the preset wavelength range
Implementation Method 2
The optical filter material is configured to allow light with a wavelength in a preset color wavelength range to pass through
Data Source
AI summary
A display substrate includes a base substrate and a filter conversion layer disposed on the base substrate. The filter conversion layer includes a light conversion material capable of absorbing light with a wavelength less than a preset wavelength range, and converting the absorbed light into light with a wavelength in the preset wavelength range. The filter conversion layer is configured to allow the light with the wavelength in the preset wavelength range to pass through.