Multi-Light Optoelectronic Sensing Using Orthogonal Source Signatures
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Solution Overview
Problem
Optical crosstalk between multiple light sources and detectors in multifunctional displays, particularly in tight spacings, leads to inaccurate sensing due to parasitic light signals, limiting device flexibility and increasing fabrication and cost.
Innovation Solution
Implementing a unique signature for each light source through frequency modulation and/or orthogonal code sequences to distinguish light sources, using incoherent light detection and processing circuits for demodulation and decoding, thereby reducing crosstalk without requiring physical elements on the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light sources are integrated in tight spacing area, then device flexibility and screen coverage are improved, but optical crosstalk between sources and detectors increases
Solution Approach 1:
The patent applies periodic modulation of light sources at different frequencies and uses time-gated detection to distinguish between multiple light sources. The modulation frequencies are periodically varied and detectors are activated in time slots corresponding to specific light sources, enabling flexible integration of multiple sources without crosstalk interference.
Solution Approach 2:
The patent introduces an intermediary signal processing layer that modulates light sources with unique frequency signatures and uses correlation detection as a mediator to distinguish between sources. This intermediary processing approach enables tight spacing of light sources while maintaining signal discrimination capability.
2Manufacturing precision
If pixel dimensions are decreased to improve resolution, then display quality is improved, but mutual distance between pixels decreases causing increased crosstalk
Solution Approach 1:
The patent uses periodic frequency modulation of light sources and time-gated detection to maintain signal discrimination even when pixels are closely spaced. The periodic variation in frequency and time-division multiplexing allows resolution improvement without crosstalk penalty.
Solution Approach 2:
The patent changes the frequency parameter of light sources and uses correlated detection to distinguish between adjacent pixels. By varying frequencies and using correlation analysis, the system achieves high resolution with minimal crosstalk despite decreased pixel dimensions and mutual distance.
3Object-affected harmful factors
If light blocking elements such as pinholes or masks are used to reduce crosstalk, then crosstalk is reduced, but device complexity and fabrication difficulty increase
Solution Approach 1:
The patent replaces mechanical light blocking elements with optical modulation and signal processing techniques. Instead of using physical pinholes or masks that increase device complexity, the system uses frequency modulation and correlation detection to achieve crosstalk reduction through software/algorithmic means.
Solution Approach 2:
The patent changes the operational parameters of light sources through frequency modulation and uses correlation analysis to distinguish signals. This parameter-based approach eliminates the need for complex physical blocking structures while achieving effective crosstalk reduction.
4Object-affected harmful factors
If physical elements are added to reduce crosstalk, then crosstalk is reduced, but manufacturing cost and fabrication complexity increase
Solution Approach 1:
The patent substitutes mechanical physical elements with optical modulation and digital signal processing. The solution uses frequency modulation and correlation detection algorithms that can be implemented through standard display driver circuitry, avoiding additional manufacturing steps and reducing fabrication cost.
Solution Approach 2:
The patent employs self-service techniques where the display driver circuitry performs correlation detection using its existing processing capabilities. The system uses its own modulated signals and built-in processing resources to achieve crosstalk reduction without requiring external physical components or additional manufacturing complexity.
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
Effectively reduces crosstalk without altering display quality, maintaining sensitivity and view angle, and eliminating the need for time synchronization or additional physical components.
Implementation Method 1
at least a photodetector PD configured for generating a detection signal DS when collected light emitted by at least one of the incoherent light sources LS1, LS2...
Data Source
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AI summary
The invention concerns an optoelectronic system (OS) comprising: - a plurality of incoherent light sources (LS); - at least one photodetector (PD) configured for generating a detection signal when illuminated by light emitted by at least one of said incoherent light sources; - a driving circuit configured for supplying said incoherent light sources with respective driving signals; - at least one processing circuit associated to said or each said photodetector for processing said detection signal; characterized in that: - said driving circuit is configured for supplying said incoherent light sources with respective driving signals comprising an AC component, wherein the AC components of different driving signals have different frequencies and/or are encoded with different orthogonal or near-orthogonal binary codes; and in that - said or each said processing circuit is configured for demodulating and/or decoding the detection signal in order to extract a contribution to said detection signal originated by illumination of the photodetector by light emitted by a predetermined one of said incoherent light sources.