Multi-Spectral Light Sensor Layout for Low Cross-Talk Color Measurement
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Solution Overview
Problem
High-cost color meters used for assessing electronic devices and light sources are not efficiently manufactured, necessitating a more cost-effective and efficient design for color measurement.
Innovation Solution
An optoelectronic device comprising a photodiode array, a guide array with light-blocking material, and a filter array with bandpass filters, allowing for energy measurement across various light spectra, including visible, IR, and UV bands, while reducing cross-talk between photodiodes through a light-blocking layer aligned with n-well regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional color meters are used for measuring color, then measurement accuracy is maintained, but manufacturing cost becomes prohibitively high
Solution Approach 1:
The device segments the spectrum into multiple wavelength bands using a photodiode array with individual spectral responses. Each photodiode measures a specific portion of the spectrum, and the controller combines these segmented measurements to reconstruct the full spectral power distribution, enabling accurate color measurement without expensive traditional spectrometers
Solution Approach 2:
The photodiode array serves multiple functions: each photodiode acts as both a detector and a spectral filter through its inherent spectral response characteristics. This multi-functional approach eliminates the need for separate filters and detectors for each wavelength band, significantly reducing manufacturing cost while maintaining measurement capability
2Device complexity
If photodiode array without light-blocking material is used, then device complexity is reduced, but cross-talk between photodiodes increases
Solution Approach 1:
The patent extracts and removes stray light and cross-talk interference from the measurement path by positioning light-blocking material between adjacent photodiodes. This extraction of harmful light ensures that each photodiode measures only the light intended for it, improving measurement reliability without significantly increasing device complexity
Solution Approach 2:
The light-blocking material acts as an intermediary element between adjacent photodiodes, preventing direct optical coupling and cross-talk. This mediator ensures optical isolation while maintaining the compact array structure, balancing simplicity with measurement accuracy
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 enables accurate and cost-effective measurement of light spectra, improving the accuracy of color assessment and reducing manufacturing costs by utilizing a multi-spectral light sensor with a guide array and filter array configuration.
Implementation Method 1
a filter array disposed over the guide array, the filter array including a plurality of bandpass filters, each bandpass filter being aligned with a different one of the plurality of guide members, each bandpass filter having a different transmission band
Implementation Method 2
a photodiode array including a plurality of first photodiodes, each first photodiode including a respective n+ region and a respective n-well region
Data Source
Figure 1A
Figure 1B~1C
Figure 2
AI summary
An optoelectronic device is disclosed, comprising: a photodiode array including a plurality of first photodiodes, each first photodiode including a respective n+ region and a respective n-well region; a guide array disposed over the photodiode array, the guide array including a plurality of guide members separated from one another by a layer of light-blocking material, the guide members being aligned with the n+ regions of the first photodiodes, such that each guide member is disposed over a different respective n+ region, and the layer of light-blocking material being aligned with the n-well regions of the first photodiodes; and a filter array disposed over the guide array, the filter array including a plurality of bandpass filters, each bandpass filter being aligned with a different one of the plurality of guide members, each bandpass filter having a different transmission band.