Illuminance Sensor Placement and Light Shielding for Accurate Ambient Light Detection
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Solution Overview
Problem
Optical sensors in electronic devices face difficulties in precisely detecting external illuminance due to the influence of the device's display, leading to incorrect light detection information, which affects various functions and user experience.
Innovation Solution
An electronic device design that includes an illuminance sensor positioned between the display and the rear surface, allowing it to measure external light independently of the display's influence, with a processor that adjusts the display brightness based on corrected illuminance data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the illuminance sensor is placed around the display, then the device structure is simplified and manufacturing is easier, but the sensor detects light influenced by the display causing incorrect illuminance measurements
Solution Approach 1:
The patent introduces a light shield as an intermediary component positioned between the display and the illuminance sensor. This light shield blocks display light from reaching the sensor, allowing the sensor to accurately detect only external ambient light. The light shield acts as a mediator that separates the display light path from the sensor detection path, resolving the contradiction between easy manufacturing and accurate measurement.
2Device complexity
If the illuminance sensor detects light including display light, then the sensor can be positioned closer to the display improving device integration, but the detected illuminance value becomes higher than the actual external illuminance
Solution Approach 1:
The patent extracts and isolates the display light component from the total light detected by the sensor. By using a light shield to block display light, the system separates the display light path from the external light detection path. This extraction allows the sensor to measure only external ambient light accurately, even when positioned close to the display for better device integration.
3Device complexity
If incorrect external light detection information is provided to brightness adjustment functions, then the system operates with simpler sensing logic, but the display brightness is adjusted incorrectly causing user discomfort
Solution Approach 1:
The patent implements a feedback mechanism where the illuminance sensor continuously monitors external ambient light levels and provides accurate feedback to the brightness adjustment system. The light shield ensures that only external light (not display light) reaches the sensor, providing reliable feedback for dynamic brightness adjustment. This feedback loop maintains simple sensing logic while ensuring accurate brightness control that adapts to changing ambient conditions.
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
Enables precise detection of external light, preventing incorrect brightness adjustments and reducing eye strain by accurately reflecting ambient light conditions.
Implementation Method 1
An optical sensor may detect light and perform various sensing operations based on, at least, sensing of light
Data Source
AI summary
An electronic device is provided. The electronic device includes a housing including a front surface and a rear surface facing, a display exposed through a portion of the front surface, an illuminance sensor disposed between the display and the rear surface to overlap an area of the display when viewed from above the front surface, a processor positioned inside the housing and operatively connected with the display, and a memory positioned inside the housing and operatively connected with the processor, wherein the memory stores instructions configured to, when executed, enable the processor to receive first illuminance data measured using the illuminance sensor, identify display parameter information associated with the first illuminance data, obtain second illuminance data based on at least a part of the display parameter information and the first illuminance data, and adjust a brightness of the display based on at least a part of the second illuminance data.