Display Power Mode Switching for E-Book Battery Life

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Solution Overview

Problem

As e-book devices incorporate higher-end features requiring higher power modes, they face reduced usable reading time due to prolonged usage in high power modes, which drains the battery quickly.

Innovation Solution

An electronic device with a power controller that switches to a low power mode when no changes are detected in selected regions of the display for a predetermined time, and switches to high power mode when changes occur in other regions, allowing static display in low power mode and dynamic updates in high power mode.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If e-book devices incorporate higher-end features requiring higher power modes, then functionality is improved, but battery life is reduced

Engineering Contradiction:

ImprovefunctionalityVSAvoidbattery life

Core Design Contradiction:

Adaptability or versatilityVSDuration of action of moving object

Solution Approach 1:

The display dynamically adjusts its power mode based on content characteristics. The system automatically transitions between low-power static display mode and high-power refresh mode depending on whether the displayed content is static or changing, optimizing the balance between functionality and battery life

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The display's operational parameters (refresh rate, power consumption) are changed based on the detected content type. When static content is detected, the display operates in low-power mode with reduced refresh rates, while dynamic content triggers high-power mode with full refresh rates, thus adapting power consumption to actual display needs

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the display operates in high power mode, then dynamic content updates are achieved, but power consumption increases

Engineering Contradiction:

Improvecontent update capabilityVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The display implements periodic monitoring of content changes and adjusts its refresh behavior accordingly. Instead of continuous high-power refreshing, the system periodically checks for content changes and only activates high-power mode when necessary, reducing overall power consumption while maintaining content update capability

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The display applies different power modes to different regions or aspects of the display operation. Static regions maintain low-power operation while dynamic regions receive full refresh rates, optimizing the balance between content update capability and power consumption through localized quality adjustment

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS8996901B2Power management of electronic device with display

Publication Date: 2015.03.31 LENOVO SWITZERLAND INTERNATIONAL GMBH

AI summary

An electronic device, such as an e-book, for displaying information includes a power source; a display having a high power mode and a low power mode, said display being powered by said power source; and a power control arrangement for switching the display to a low power mode when no changes to selected regions of the display are required for at least a predetermined time. The power control arrangement switches said display from said low power mode to said high power mode when changes of said display are required in display portions other than said selected portions. A method for operating the electronic device. A computer readable medium having computer readable instructions thereon for implementing the method.