Wavelength-Selective Absorber for Optoelectronic Contrast
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Solution Overview
Problem
Optoelectronic components face challenges in achieving improved contrast perception due to reflection from ambient light, which reduces brightness and contrast, especially when conventional absorbers almost completely absorb visible light and the radiation emitted by semiconductor chips.
Innovation Solution
Incorporating an absorber with a matrix material and organic semiconductor or chromophore-based absorbing material that is predominantly transmissive to the electromagnetic radiation emitted by semiconductor chips, while absorbing at least 70% of visible light from ambient light, thereby reducing reflection and enhancing contrast perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional absorber that almost completely absorbs visible light is used, then the contrast perception is improved by suppressing ambient light reflection, but the brightness and efficiency of the emitted radiation from semiconductor chips is reduced
Solution Approach 1:
The absorber is designed with wavelength-selective properties: it strongly absorbs visible light (400-700nm) from ambient light sources while being predominantly transmissive to the specific wavelength ranges emitted by semiconductor chips (infrared, visible, or ultraviolet). This local differentiation in absorption characteristics allows the absorber to suppress harmful ambient light reflection without interfering with the useful emitted radiation, thereby resolving the contradiction between improving contrast and maintaining brightness
Solution Approach 2:
The absorber's optical parameters are specifically tuned to achieve wavelength-dependent behavior. By adjusting the absorption spectrum of the absorber material, it is configured to absorb at least 70% of visible light radiation intensity while maintaining high transmissivity for the chip's emission wavelengths. This parameter optimization enables simultaneous achievement of high contrast (through ambient light absorption) and high brightness (through emission wavelength transmission)
2Object-affected harmful factors
If an absorber is introduced to suppress reflection from ambient light, then the contrast perception is improved, but the complexity of the optoelectronic component increases
Solution Approach 1:
The absorber serves multiple functions simultaneously: it acts as a reflective suppressor for ambient light, a wavelength-selective filter for chip emission, and a contrast enhancement element. By integrating these multiple functions into a single component with specific optical properties, the design avoids the need for separate elements for each function, thereby managing device complexity while achieving the desired performance improvements
Solution Approach 2:
The absorber is constructed using composite material structures or combinations of materials with complementary optical properties. This allows the absorber to exhibit both strong absorption in the visible range and high transmission in the chip emission range, achieving the desired dual functionality through material composition rather than complex structural arrangements
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 suppresses ambient light reflection, maintaining brightness and achieving improved contrast perception by allowing the emitted radiation to be predominantly transmitted, thus enhancing the efficiency and visual impact of optoelectronic components.
Implementation Method 1
the absorber absorbs at least 70% of the total radiation intensity of the electromagnetic spectrum of the visible light of the ambient light under illumination with ambient light
Implementation Method 2
the absorber is predominantly transmissive for the emitted electromagnetic radiation of the first wavelength range
Data Source
AI summary
An optoelectronic component is specified comprising: at least one radiation-emitting semiconductor chip (1) which during operation emits electromagnetic radiation of a first wavelength range, and an absorber, wherein the absorber is predominantly transmissive to the emitted electromagnetic radiation of the first wavelength range, and the absorber absorbs at least 70% of the total radiation intensity of the electromagnetic spectrum of the visible light of the ambient light.