Wave Guide Textured Surface for Light Sensor Angular Response
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Solution Overview
Problem
Ambient light sensors in flat panel displays struggle to accurately detect ambient light intensity across varying angles, leading to inconsistent display brightness and increased power consumption.
Innovation Solution
A display assembly with a light sensor module featuring a wave guide having a textured surface with a geometric structure that guides ambient light to strike the sensor at a consistent angle, proportional to the cosine of the angle of incidence, ensuring uniform light intensity measurement regardless of the angle of incidence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional light sensor is used without a wave guide, then the device structure is simple, but the measurement precision of ambient light intensity varies with angle of incidence
Solution Approach 1:
A wave guide component is introduced as an intermediary element between the window and the light sensor. This wave guide includes a textured surface with geometric structures that mediate the light transmission process, ensuring that ambient light strikes the sensor at a consistent angle proportional to the cosine of the angle of incidence, thereby achieving angle-independent measurement precision
Solution Approach 2:
The geometric structure of the textured surface is specifically configured based on the material and thickness of the window to transform the angular distribution of incident light. By changing the physical parameters of the light transmission path through the geometric structure design, the system achieves consistent light intensity measurement regardless of the angle of incidence
2Adaptability or versatility
If the light sensor detects ambient light at varying angles, then the sensor can capture light from different directions, but the measurement accuracy becomes inconsistent
Solution Approach 1:
The textured surface of the wave guide creates different local optical paths for light arriving at different angles. Each region of the textured surface is configured to redirect light such that it strikes the sensor at a consistent angle, ensuring uniform measurement characteristics across the entire angular range while maintaining adaptability to light from different directions
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 configuration enhances the accuracy of ambient light detection, allowing for more effective adjustment of display brightness and reduced power consumption by ensuring consistent light intensity measurement across different angles of incidence.
Implementation Method 1
said geometric structure configured to guide ambient light travelling through said window onto said light sensor such that an intensity of ambient light that strikes said sensor varies substantially proportionally according to a function comprising a cosine of an angle of incidence of ambient light striking said window
Implementation Method 2
said wave guide configured to scatter light emitted from said light emitter out of said window at angle wider than said first angle
Data Source
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AI summary
Electronic displays encounter visibility issues due to varying ambient light conditions. An ambient light sensor can be provided to sense ambient light and dynamically adjust display brightness to compensate for changes in ambient light. A wave guide for improving angular response in a light sensor is provided.