Improving Light Sensor Accuracy with Compensation Methods
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Summary
Problems
Current light sensors in electronic devices face accuracy issues due to variations in filter thickness and pigment or dye concentration, affecting the accuracy of lighting environment measurements.
Innovation solutions
A method is introduced to compensate for these variations by determining a compensation factor using a test light source with components outside the pass band of the color sensor, calculating the first transmission value, and applying it to correct color signals, thereby improving measurement accuracy.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If color filters with pigment or dye are used in light sensors, then the light sensor can selectively sense different wavelengths, but variations in filter thickness and pigment concentration cause measurement inaccuracies
Why choose this principle:
The patent applies parameter changes by using a test light source with a known spectrum to measure the actual transmission characteristics of the color filter. By comparing the measured transmission values with expected values, the system calculates compensation factors that adjust for variations in filter thickness and pigment concentration. This transforms the fixed, variable-prone filter into a measurable and compensable component, resolving the contradiction between wavelength selectivity and measurement accuracy.
Principle concept:
If a test light source with components outside the pass band is used, then compensation for filter variations can be determined, but the processing complexity increases
Why choose this principle:
The patent implements feedback by measuring the actual transmission of the color filter using a test light source and using this information to calculate compensation factors. These compensation factors are then applied to correct the color sensor readings. The system continuously monitors and adjusts for filter variations, creating a closed-loop feedback mechanism that improves measurement accuracy without requiring complex hardware changes.
Application Domain
Data Source
AI summary:
A method is introduced to compensate for these variations by determining a compensation factor using a test light source with components outside the pass band of the color sensor, calculating the first transmission value, and applying it to correct color signals, thereby improving measurement accuracy.
Abstract
An embodiment of a method for processing light sensor signals comprises illuminating a clear sensor (CS) and a color sensor (RS, GS, BS) of a light sensor system with a test light having a test spectrum. Therein the color sensor (RS, GS, BS) comprises an optical filter and is designed to sense light with a wavelength within a pass band of the filter and the test spectrum has components outside of the pass band. A clear test signal which is generated by the clear sensor (CS) and a color test signal which is generated by the color sensor (RS, GS, BS) are received. Then a first transmission value T is determined based on the clear test signal and on the color test signal. Finally, a compensation factor Kr, Kg, Kb is calculated based on the first transmission value T and on a nominal transmission value Tn of the filter.