Photodiode Matrix Detection With Synchronized Row Illumination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing detection devices suffer from power loss due to multiple light-emitting elements continuously illuminating areas not being scanned, leading to inefficiency.
Innovation Solution
A detection device with a configuration of photodiodes and light-emitting elements arranged in a matrix, where photodiodes and light-emitting elements are sequentially driven in rows, and light-emitting elements are controlled to illuminate only the areas corresponding to the photodiodes being scanned, reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple light-emitting elements are continuously lit for the entire area during optical sensor scanning, then the detection device can cover a larger detection area, but power loss increases due to illumination of areas not being scanned
Solution Approach 1:
The patent divides the detection area into multiple regions corresponding to different rows of photodiodes and light-emitting elements. By segmenting the illumination and detection into row-by-row units, the system can activate only the necessary segments at any given time, reducing overall power consumption while maintaining comprehensive detection coverage.
Solution Approach 2:
The patent implements periodic scanning where the optical sensor and light-emitting elements sequentially activate different rows in a systematic pattern. This periodic activation ensures that only the current row being scanned receives illumination, eliminating continuous illumination of entire areas and thereby reducing power loss while maintaining detection effectiveness.
2Reliability
If multiple light-emitting elements are continuously lit, then complete coverage of the detection area is achieved, but efficiency decreases due to unnecessary power consumption
Solution Approach 1:
The patent introduces dynamic control where the illumination pattern adapts to the scanning position. The light-emitting elements are dynamically activated only when their corresponding photodiode row is being scanned, creating a moving illumination pattern that matches the detection needs, thereby improving energy efficiency without compromising detection completeness.
Solution Approach 2:
The system employs feedback control where the scanning position of the optical sensor determines which light-emitting elements should be active. This feedback mechanism ensures that illumination is precisely synchronized with detection, activating lights only where and when needed, thus maintaining detection reliability while enhancing energy efficiency.
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 device effectively reduces power loss by ensuring that light is emitted only to the areas being scanned, enhancing efficiency and minimizing unnecessary power usage.
Implementation Method 1
an optical sensor including a plurality of photodiodes arranged in a planar configuration
Implementation Method 2
a light source including a plurality of light-emitting elements configured to emit light to the photodiodes
Data Source
AI summary
According to an aspect, a detection device includes: an optical sensor comprising photodiodes; a light source including light-emitting elements; and an object placement member that has a light-transmitting property and is configured to be disposed between the optical sensor and the light source, and on which objects to be detected are to be placed. The photodiodes are arranged in a matrix having a row-column configuration and are configured to be sequentially driven along the second direction at least one row by one row. The light-emitting elements are arranged in a matrix having a row-column configuration and are configured to be sequentially driven along the second direction at least one row by one row. At a given time, photodiodes to be driven among the photodiodes correspond to light-emitting elements to be lit among the light-emitting elements in plan view.