Light Sensor Voltage Reversal for Single-Window Fine Counting
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Solution Overview
Problem
Conventional light sensors require multiple window times for sensing and fine counting operations, leading to inefficiencies and inaccuracies in light signal detection, especially when placed under electronic device screens.
Innovation Solution
A light sensor with a voltage reversing mechanism that charges a capacitor to a first voltage, reverses it to form a negative reverse voltage, and then charges it again to a second voltage, allowing for a single fine counting operation within a single window time, thereby improving accuracy and flexibility in optical applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional light sensors use multiple window times for sensing and fine counting operations, then measurement precision can be maintained, but device complexity and time consumption increase
Solution Approach 1:
The patent inverts the conventional sensing approach by using a voltage reversing mechanism that charges a capacitor to a first voltage, reverses it to form a negative reverse voltage, and then charges it again to a second voltage. This inversion allows the sensor to complete both sensing and fine counting operations within a single window time, eliminating the need for multiple window times and reducing time control complexity while maintaining measurement precision
Solution Approach 2:
The patent merges the sensing operation and fine counting operation into a single window time period. By combining these operations that were traditionally separated into multiple window times, the patent reduces the complexity of time control mechanisms while maintaining the accuracy required for light signal detection
2Measurement precision
If conventional light sensors perform fine counting operations multiple times, then measurement accuracy is improved, but the operation time increases
Solution Approach 1:
The voltage reversing mechanism inverts the conventional approach by charging the capacitor to a positive voltage, reversing it to a negative voltage, and then charging it again to a positive voltage within a single window time. This inversion enables the completion of multiple counting operations (first coarse count, second coarse count, and fine count) in one time period, reducing the total operation time while maintaining measurement accuracy
Solution Approach 2:
The patent maintains continuous useful action by performing the voltage reversal and multiple counting operations without interruption within a single window time. The capacitor is continuously charged, reversed, and charged again while the counter performs multiple counting operations, eliminating idle time between operations that would otherwise be required
3Adaptability or versatility
If light sensors are placed under electronic device screens, then integration flexibility is improved, but sensing accuracy deteriorates due to screen interference
Solution Approach 1:
The voltage reversing mechanism helps overcome screen interference by creating a distinctive sensing pattern that can differentiate between ambient light and screen-emitted light. The inversion process creates negative voltage states that provide contrast against the continuous light environment under screens, improving the sensor's ability to accurately detect light signals even when placed under electronic device screens
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
This approach enables accurate and continuous light signal sensing within a single window time, reducing the complexity of time control mechanisms and shortening the fine counting operation time, making the sensor suitable for placement under electronic device screens.
Implementation Method 1
the photoelectric component is configured to convert light energy of a first light signal into a first photocurrent and then to provide the first photocurrent to a capacitor to charge the capacitor to a first voltage
Data Source
AI summary
A light sensor having a voltage reversing mechanism is provided. A photoelectric component converts a first light signal into a first photocurrent. A capacitor is charged to a first voltage by the first photocurrent. A counter counts a first coarse count value according to the first voltage. The photoelectric component converts a second light signal into a second photocurrent. The capacitor is charged from a reversed first voltage to a second voltage by the second photocurrent. The counter counts a second coarse count value according to the second voltage. The counter counts a fine count value according to the second coarse count value. One of the first light signal and the second light signal is emitted by both of an ambient light source and a light-emitting component and then reflected by a tested object, and the other one of them is emitted by only the ambient light source.