Photosensitive Chip Proximity Ambient Light Interference
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Solution Overview
Problem
Conventional photosensitive sensors for proximity and ambient light detection often interfere with each other when integrated in multifunctional electric equipment, leading to inaccurate light intensity detection.
Innovation Solution
A photosensitive chip that integrates proximity and ambient light sensors using a sampling clock generator unit, ambient light sensor unit, and proximity sensor unit, with distinct time periods for sampling and driving the luminescent unit to prevent interference, and a photosensitive circuit with a capacitance and comparison unit to calculate light variations without external processors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If proximity sensor and ambient light sensor are integrated in the same device, then multifunctionality is improved, but measurement precision deteriorates due to mutual interference between the two sensors
Solution Approach 1:
The patent implements periodic action by dividing the operating cycle into distinct time periods: a first time period for proximity detection and a second time period for ambient light detection. The sampling clock generator unit generates sampling clocks that switch between these periods, ensuring that the proximity sensor and ambient light sensor operate alternately rather than simultaneously. This temporal separation eliminates mutual interference while maintaining both functions within a single integrated device.
2Measurement precision
If independent systems are used for proximity sensor and ambient light sensor, then measurement precision is maintained, but device complexity increases
Solution Approach 1:
The patent applies merging by integrating the proximity sensor and ambient light sensor into a single photosensitive chip. The chip includes a photosensitivity unit that serves both functions, along with a sampling clock generator unit and driving clock generator that coordinate the alternating operation of both sensors. This unified structure reduces device complexity compared to using separate independent systems, while maintaining measurement precision through temporal separation of operations.
Solution Approach 2:
The photosensitivity unit in the integrated chip serves multiple functions: it acts as both the proximity sensor and ambient light sensor depending on the operating time period. The sampling clock generator unit provides universal control by generating both the first sampling clock for proximity detection and the second sampling clock for ambient light detection, enabling a single component to perform what would traditionally require separate systems.
3Measurement precision
If external processor is used to calculate light variation, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The integrated chip implements self-service by incorporating all necessary functional units directly into the chip structure. The sampling clock generator unit generates sampling clocks, the photosensitivity unit detects light, and the driving clock generator controls the luminescent unit - all without requiring external processors. This self-contained design maintains measurement precision while reducing device complexity and manufacturing costs by eliminating the need for separate processor components.
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 allows for accurate detection of ambient light and object proximity without external processors, reducing equipment volume and manufacturing costs by eliminating the need for a light emitting diode and processor.
Implementation Method 1
A photoelectric semiconductor capable of receiving a light and generating a photoelectric current according to the received light
Implementation Method 2
A capacitance is used to store the photoelectric current
Data Source
AI summary
The present invention discloses a photosensitive circuit comprising a photosensitivity unit, a capacitance and a switch unit. The photosensitivity unit is capable of receiving a received light, and the capacitance is capable of storing a photoelectric current corresponding to the received light. The switch unit is used to respectively provide the positive voltage of the capacitance to a comparison unit at a first time period, and the negative voltage of the capacitance to a comparison unit at a second time period. The comparison unit outputs a detection value according to the positive voltage and the negative voltage of the capacitance, the detection value is related to the distance between an object and the photosensitive circuit. The present invention further disclose a photosensitive chip to drive a luminescent unit to provide a detective light. The photosensitive chip comprises a sampling clock generator, the ambient light sensor unit, a proximity sensor unit and a driving clock generator.