Optical Driver Signal Saturation Control via Dynamic Pulse Adjustment
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Solution Overview
Problem
Existing optical driver arrangements face saturation issues in signal detection for proximity and gesture detection, limiting the distance range and accuracy of target detection.
Innovation Solution
An optical driver arrangement comprising a comparator and a pulse generator that adjusts the parameters of the driver signal, such as pulse number, height, width, frequency, and distance, based on feedback from a light sensor, to prevent signal saturation by controlling the energy emitted by the light source, thereby extending the detection range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the light source emits multiple pulses to extend detection range, then the detection range is improved, but signal saturation occurs when the target is close
Solution Approach 1:
The patent applies dynamics by making the number of pulses emitted by the light source variable rather than fixed. The pulse generator dynamically adjusts the number of pulses based on feedback from the light sensor, allowing the system to adapt to different target distances and prevent saturation while extending detection range.
Solution Approach 2:
The patent implements feedback by using the light sensor to detect reflected light from the target and feed this information back to the pulse generator. The pulse generator uses this feedback to automatically adjust the number of pulses emitted, creating a closed-loop control system that prevents signal saturation and extends detection range.
2Power
If the light source emits high energy to improve signal strength, then the signal strength is improved, but saturation of the sensed output signal occurs
Solution Approach 1:
The system dynamically adjusts the energy emitted by the light source by varying the number of pulses based on target distance. When the target is close, fewer pulses are emitted to prevent saturation; when the target is far, more pulses are emitted to maintain signal strength, thus resolving the contradiction between signal strength and saturation.
Solution Approach 2:
The patent changes the parameter of pulse number to control the total energy emitted by the light source. By adjusting this parameter based on feedback from the light sensor, the system maintains optimal signal strength without causing saturation of the sensed output signal.
3Device complexity
If a fixed number of pulses is emitted to simplify control, then the device complexity is reduced, but the detection range and accuracy are limited
Solution Approach 1:
The system uses self-service by implementing automatic pulse control where the pulse generator automatically adjusts the number of pulses based on feedback from the light sensor, without requiring external manual intervention. This maintains detection accuracy and range while keeping the control mechanism relatively simple.
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 effectively limits signal saturation and enhances the detection range by dynamically adjusting the driver signal parameters, allowing for more accurate and wider-range proximity and gesture detection.
Implementation Method 1
the light source emits a single pulse or a fixed number of pulses, called a pulse burst
Implementation Method 2
Light that is reflected by a target such as a hand is detected by a light sensor
Implementation Method 3
a light sensor such as a photo diode
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
An optical driver arrangement (10) comprises a comparator (11) and a pulse generator (15). The comparator (11) comprises a first input (12) for receiving a sensed output signal (S1) derived from a sensor signal (S2) generated by a light sensor (24), a second input (13) for receiving a reference signal (S3) and a comparator output (14) for providing a comparator signal (S4). The pulse generator (15) comprises a control input (16) coupled to the comparator output (14) and a generator output (22) for providing a driver signal (S5) to a light source (21). The driver signal (S4) comprises a series of at least one pulse and a parameter of the driver signal (S4) is controlled by the comparator signal (S4).