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US 9,041,698 B2Granted
Wave guide for improving light sensor angular response
AssigneeBlackBerry Limited
InventorsHsin Chin Lee, Matthew Broga
Life of this patent
Estimating the term…
Abstract
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.
Claims20
A light sensor module comprising:
- a window for transmitting ambient light;
- a light sensor for receiving said ambient light;
- a wave guide comprising a textured surface disposed between said window and said light sensor;
- said textured surface having a geometric structure;
- said geometric structure configured according to a material and a thicknesses of said window;
- and
- said geometric structure further configured to guide said ambient light travelling through said window onto said light sensor such that an intensity of said ambient light that strikes said light sensor varies substantially proportionally according to a function comprising a cosine of an angle of incidence of ambient light striking said window.
4 more elements
A wave guide comprising:
- a textured surface for positioning between a window and a light sensor;
- said textured surface having a geometric structure;
- said geometric structure configured according to a material and a thicknesses of said window;
- and
- said geometric structure further 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.
2 more elements
Dependencies are inferred from the claim text.