In-Pixel Modulated Detector Array for Compact High-Resolution LiDAR
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Solution Overview
Problem
Existing LIDAR systems face challenges in miniaturization and integration due to complex optical beam paths and modulator architectures, limiting their resolution and scalability.
Innovation Solution
Incorporating in-pixel modulation within a CMOS image sensor, using a detector array with integrated polarization-sensitive photodiodes and transistors to modulate sensitivity, eliminating the need for external modulators and simplifying the optical beam path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex optical beam paths and modulator architectures are used to achieve high-resolution LIDAR, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the modulator function directly into the pixel structure of the detector array, combining what were previously separate components (detector and modulator) into a single integrated unit. This eliminates the need for external modulators and simplifies the optical beam path while maintaining high-resolution LIDAR capabilities
Solution Approach 2:
The pixel structure is designed to perform multiple functions: detecting light and modulating the signal simultaneously. The detector array serves both as the receiving element and the modulation element, reducing the overall system complexity while preserving measurement precision
2Measurement precision
If complex receiver architectures with external modulators are used, then measurement precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
By integrating the modulator function directly into the pixel structure, the patent eliminates the need for separate external modulators and complex optical beam paths, making the system easier to manufacture and integrate while maintaining distance measurement accuracy
Solution Approach 2:
The patent extracts the modulation function from external components and relocates it directly into the pixel structure, removing unnecessary external modulators and simplifying the overall system architecture for easier manufacturing
3Measurement precision
If discrete optical components are used in LIDAR systems, then measurement precision is maintained, but volume of stationary object increases
Solution Approach 1:
The patent merges multiple discrete optical components into a single integrated detector array with built-in modulation capability, significantly reducing the system volume while maintaining high-resolution LIDAR performance
Solution Approach 2:
The modulator function is nested within the pixel structure of the detector array, with the modulation elements integrated directly into the detector pixels. This nested arrangement eliminates the need for separate external modulators and reduces overall system volume
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
Enables a compact, cost-effective LIDAR system with high pixel count and resolution, capable of distance measurement without complex receiver architectures, suitable for miniaturized applications.
Implementation Method 1
a light source (e.g., a laser) is emitting light pulses towards an object where the light pulse is reflected
Implementation Method 2
The backward travelling light pulse is then collected by an appropriate photodetector
Implementation Method 3
the sensitivity of all of the SPADs may be modulated, or the sensitivity of one section of the SPADs can be modulated differently from another section of the SPADs
Data Source
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AI summary
In at least one embodiment an imaging system comprises a light emitter, a detector array and a synchronization circuit. The detector array comprises pixels, which have a built-in modulation function. The synchronization circuit is operable to synchronize acquisition performed by detector array with emission by means of the light source.