Adaptive Indicator Light Brightness Control via Ambient Sensors

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Solution Overview

Problem

Portable information handling systems face significant power consumption and aesthetic issues due to the high energy usage and distracting nature of multiple active indicator lights, particularly in varying ambient light conditions.

Innovation Solution

A system and method that adjusts the brightness of indicator lights based on detected ambient light levels and user preferences, using control logic and firmware to automatically or manually modify light output, with stored user preferences and PWM signals for optimized power management and aesthetic enhancement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If multiple indicator lights are kept active to provide system status information, then information display capability is improved, but power consumption increases significantly

Engineering Contradiction:

Improvesystem status information displayVSAvoidbattery power consumption

Core Design Contradiction:

Loss of informationVSUse of energy by moving object

Solution Approach 1:

The patent applies dynamics by making the indicator light brightness adjustable and adaptive rather than fixed. The system dynamically adjusts LED brightness based on ambient light conditions detected by sensors, allowing the display function to be maintained while power consumption varies according to environmental conditions. This resolves the contradiction by making the information display adaptive to external conditions.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the brightness parameter of indicator lights based on ambient light levels. By detecting ambient light conditions and adjusting LED output parameters accordingly, the system maintains adequate status information visibility while reducing power consumption in appropriate conditions. This parameter adjustment directly addresses the energy-information display tradeoff.

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If multiple indicator lights operate at maximum brightness to ensure visibility, then information visibility is improved, but aesthetic appearance deteriorates in dim environments

Engineering Contradiction:

Improveindicator light visibilityVSAvoidaesthetic appearance in dim environment

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The system dynamically adjusts indicator light brightness based on ambient light detection. In dim environments, the ambient light sensor triggers reduced LED brightness, preventing the harsh aesthetic impact of maximum brightness lights while still providing adequate status information. This dynamic adaptation resolves the contradiction between visibility and aesthetic appearance.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements feedback by using ambient light sensors to detect environmental light conditions and automatically adjusting indicator light brightness accordingly. This closed-loop control ensures that lights are appropriately dimmed in low-light conditions to maintain aesthetic appearance while remaining visible enough to convey system status, eliminating the need for manual intervention.

Inventive Principle:

Principle #23Feedback

3Use of energy by moving object

If ambient light sensors and control logic are added to adjust indicator light brightness, then power consumption is reduced and aesthetic appearance is enhanced, but device complexity increases

Engineering Contradiction:

Improvebattery power consumptionVSAvoidcontrol system complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent applies universality by integrating the ambient light sensor and control logic into existing portable computer functionality. The same control system manages both display backlight and indicator light brightness, and the ambient light detection serves multiple purposes including aesthetic adjustment and power management. This multi-functionality approach minimizes the complexity overhead of adding the sensor and control capabilities.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 reduces power consumption and enhances the aesthetic appearance of indicator lights by dynamically adjusting brightness according to ambient conditions, optimizing battery life and user experience.

Implementation Method 1

A plurality of ambient light sensors are disposed near the display

Methodology Applied

Scientific EffectPhotodetection: Photoelectric Effect

Implementation Method 2

The control logic is operable to generate a pulse width modulation (PWM) control signal for each of the plurality of indicator lights

Methodology Applied

Scientific EffectPulse Width Modulation:

Data Source

PatentUS7501960B2Control of indicator lights in portable information handling system using ambient light sensors

Publication Date: 2009.03.10 DELL PROD LP

AI summary

An improved system and method for controlling the brightness of indicator lights used on portable information handling systems. Various embodiments of the invention optimize the output of the indicator lights in accordance with detected ambient light levels. The brightness of the indicator lights can be adjusted automatically in accordance with a fixed response curve or manually by user inputs. In some embodiments, the brightness is adjusted in accordance with user-designated preferences that are stored in a brightness preference table and correlated with detected ambient light levels.