Light-Scattering Desiccant for Ambient Light Sensor Accuracy
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Solution Overview
Problem
Ambient light sensors in electronic devices face challenges such as sensitivity to light angle variations, noise from infrared light, and environmental degradation, which affect their accuracy in measuring ambient light conditions and adjusting display settings accordingly.
Innovation Solution
An ambient light sensing system with a color ambient light sensor, a light diffuser layer containing polymer light-scattering desiccant particles, and an infrared-light-blocking filter with a polymer substrate and thin-film interference filter, along with desiccant particles in support structures to enhance infrared light blocking and reduce sensor noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an infrared-light-blocking filter is used to block infrared light, then infrared light blocking is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into the desiccant material itself: it simultaneously absorbs moisture (desiccant function), scatters light (light-scattering function), and blocks infrared light (infrared-absorbing function). This merging eliminates the need for separate infrared-blocking filter layers, reducing device complexity while maintaining infrared blocking capability.
Solution Approach 2:
The desiccant material is designed to perform multiple functions: moisture absorption, visible light scattering, and infrared light absorption. This multi-functionality allows a single material to replace what would traditionally require multiple separate components, simplifying the overall device structure.
2Measurement precision
If a light diffuser layer is added to reduce angle-of-incidence sensitivity, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The light diffuser function is merged into the desiccant material through the incorporation of light-scattering particles. This integration means the same material that absorbs moisture and infrared light also performs light diffusion, eliminating the need for a separate diffuser layer and reducing device complexity.
Solution Approach 2:
The desiccant material is formulated as a composite containing multiple functional components: desiccant substances for moisture absorption, light-scattering particles for diffusion, and infrared-absorbing substances. This composite structure enables multiple optical and environmental functions within a single material layer.
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 system improves the accuracy of ambient light measurements by reducing dependence on the infrared-light-blocking filter and enhancing the blocking of infrared light, leading to better color adjustment of display settings across different lighting environments.
Implementation Method 1
The light diffuser may have a polymer light diffuser layer with embedded light-scattering desiccant particles
Implementation Method 2
If desired, the desiccant particles can absorb infrared light while passing (scattering) visible light
Implementation Method 3
The infrared-light-blocking filter may have a polymer substrate and a thin-film interference filter formed from a stack of inorganic thin-film layers on the polymer substrate
Implementation Method 4
Light-scattering desiccant particles may be incorporated into the polymer substrate of the infrared-light-blocking filter
Data Source
AI summary
An ambient light sensor system may be mounted in alignment with a window in a display cover layer associated with a display in an electronic device. The ambient light sensor system may have a light diffuser layer and an infrared-light-blocking filter. The light diffuser layer may have a polymer layer with embedded light-scattering desiccant particles. An ambient light sensor in the ambient light sensor system may receive ambient light through the light diffuser layer and the infrared-light-blocking filter. The infrared-light-blocking filter may have a polymer substrate and a thin-film interference filter formed from a stack of inorganic thin-film layers on the polymer substrate. Light-scattering desiccant particles may be incorporated into the polymer substrate of the infrared-light-blocking filter. Desiccant may also be incorporated into ambient light sensor support structures.