Ambient Light Sensor System for Display White Point Adjustment
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Solution Overview
Problem
Electronic devices with displays face challenges in maintaining a pleasing image appearance under varying ambient lighting conditions, as existing technologies often rely on single light sensors that fail to accurately adjust the color cast and intensity in mixed lighting environments.
Innovation Solution
The implementation of multiple ambient light sensors, including a front and rear color ambient light sensor, which gather intensity and color measurements to adjust the display's white point using a conditional weighting function that combines data based on linear or logarithmic ambient light intensity weights, depending on the lighting environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single ambient light sensor is used, then the device structure is simple, but the color cast adjustment accuracy deteriorates in mixed lighting environments
Solution Approach 1:
The patent divides the ambient light sensing function into multiple sensors positioned at different locations (front and rear of the display). Each sensor independently measures ambient light characteristics from its specific direction, allowing the system to capture mixed lighting conditions that a single sensor cannot detect accurately.
Solution Approach 2:
The patent adds spatial dimension to ambient light measurement by placing sensors at different positions (front and rear) of the display. This multi-dimensional sensing approach enables the system to differentiate between light sources from different directions, improving color cast adjustment accuracy in complex lighting environments.
2Measurement precision
If multiple ambient light sensors are used, then the color cast adjustment accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent makes each ambient light sensor multi-functional by having them perform both luminance measurement and color temperature measurement. This universal functionality reduces the need for separate sensor types and simplifies the overall system architecture despite using multiple sensors.
Solution Approach 2:
The patent introduces a processing circuit as an intermediary that receives signals from multiple sensors and computes weighted average values. This intermediary component simplifies the complexity by providing a systematic method for integrating multiple sensor inputs into a unified ambient light characterization.
3Device complexity
If uniform weighting is applied to all sensors, then the processing is simple, but the adaptability to different lighting environments deteriorates
Solution Approach 1:
The patent implements dynamic weighting where the contribution of each sensor to the final ambient light measurement varies based on lighting conditions. The weighting factors are adjusted according to the relative luminance levels detected by front and rear sensors, enabling the system to adapt to different lighting scenarios such as front-lit, rear-lit, or mixed lighting environments.
Solution Approach 2:
The patent changes the weighting parameters based on detected lighting conditions. When front ambient light luminance exceeds rear ambient light luminance, different weighting factors are applied compared to when rear lighting dominates. This parameter adjustment enables the system to maintain accuracy across diverse lighting environments.
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 solution effectively adjusts the display's color cast and intensity to match the ambient lighting conditions, providing a more accurate and user-friendly viewing experience by considering both front and rear lighting sources, thus enhancing the visual appeal of images across different lighting scenarios.
Implementation Method 1
A front ambient light sensor may gather a front ambient light intensity measurement and a front ambient light color measurement. A rear ambient light sensor may gather a rear ambient light intensity measurement and a rear ambient light color measurement.
Implementation Method 2
The control circuitry may adjust the color cast of the display (e.g., the white point of the display) using a combined color value that is produced using a combining function that operates on ambient light data from multiple sensors.
Data Source
AI summary
An electronic device such as a desktop computer or other device may have an electronic device housing with front and rear faces. A display may be mounted on the front face. The electronic device may include multiple ambient light sensors such as a front color ambient light sensor on the front face and a rear color ambient light sensor on the rear face. The front ambient light sensor gathers a front ambient light intensity measurement and a front ambient light color measurement. The rear ambient light sensor gathers a rear ambient light intensity measurement and a rear ambient light color measurement. During operation, control circuitry in the electronic device takes action based on data from the ambient light sensors. The control circuitry may adjust a white point of the display using a combined color value that is produced using a combining function.