Shared Read-Line Light Receiver for Accurate Direct ToF Scanning
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Solution Overview
Problem
Distance measurement using the direct ToF method with linear scanning of light sources often results in distorted or deviated scan trajectories, necessitating a wider light reception range and increased number of wirings to maintain accuracy, leading to unnecessary power consumption and wiring complexity.
Innovation Solution
A light reception device with a matrix array of light receiving elements and shared read lines connecting to multiple elements, allowing for efficient reading and reducing the number of wirings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light reception range is widened to account for scan trajectory distortion and deviation, then distance measurement accuracy is improved, but the number of wirings increases
Solution Approach 1:
Multiple light receiving elements share common read lines, merging their signal transmission paths. This reduces the total number of wirings while maintaining the ability to read signals from all elements simultaneously, thus reducing device complexity without compromising measurement accuracy
Solution Approach 2:
Read lines are designed to serve multiple light receiving elements simultaneously, making them multi-functional. Each read line can read signals from multiple elements, reducing the overall wiring count while maintaining full reading capability across the expanded light reception range
2Measurement precision
If the number of wirings is increased to enable simultaneous reading from a wider light reception range, then distance measurement accuracy is improved, but power consumption increases
Solution Approach 1:
By merging the read lines so that multiple light receiving elements share common signal transmission paths, the total number of active wirings is reduced. Fewer wirings mean lower power consumption for signal transmission while still enabling simultaneous reading from all elements in the widened reception range
3Measurement precision
If the light reception range is widened to account for scan trajectory distortion and deviation, then distance measurement accuracy is improved, but wiring complexity increases
Solution Approach 1:
Read lines are merged to serve multiple light receiving elements simultaneously. This consolidation reduces wiring complexity by creating a more organized and efficient signal transmission architecture, where shared read lines simplify the overall wiring configuration while maintaining full reading capability
Solution Approach 2:
The read lines are designed with multi-functionality to handle signals from multiple light receiving elements. This universal design approach simplifies the wiring configuration by reducing the variety of connection types needed, making the overall system easier to manufacture and maintain
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 highly accurate distance measurement with a smaller number of wires, minimizing power consumption and simplifying the wiring configuration.
Implementation Method 1
reflection light generated as light emitted from a light source is reflected by the measured object
Implementation Method 2
the distance to the target is measured based on a time between the emission of light and the reception as the reflection light
Data Source
AI summary
A light reception device according to an embodiment includes: a light receiving unit including a plurality of light receiving elements arranged in a matrix array; and a plurality of read lines that transmits each of signals read from the plurality of light receiving elements. In the light reception device, each of the plurality of read lines is connected to two or more light receiving elements among the plurality of light receiving elements.