Dual-Processor Backlight Control for Power Saving
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Solution Overview
Problem
Portable electronic devices with display panels and backlights face high power consumption issues, leading to reduced driving time, as existing methods to conserve power are inadequate in managing backlight usage effectively.
Innovation Solution
The implementation of a dual-processor system where a high-processing-power processor controls the light source for display operations and a low-processing-power processor takes over for power-saving modes, allowing for dynamic control of light emission and reducing overall power consumption by shifting tasks based on usage patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transmission-type display panel and backlight are used to achieve high display quality and screen luminance, then display quality is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic backlight control by switching between a first processor and a second processor based on display update requirements. The backlight luminance is adjusted dynamically - using the power-saving second processor for static displays and the high-performance first processor only when display updates are needed, thereby reducing overall power consumption while maintaining required screen luminance
Solution Approach 2:
The system changes operational parameters by switching between different processor modes. When display content is static, the system transitions to a low-power mode with reduced backlight control overhead. When display updates occur, it switches to high-performance mode, effectively changing the power consumption parameter based on actual display activity
2Duration of action of moving object
If power consumption of backlight and arithmetic circuit is reduced to extend driving time, then power consumption is improved, but display quality and response time may deteriorate
Solution Approach 1:
The system dynamically adapts its operational state based on display update requirements. During static display periods, it operates in a power-saving state that extends driving time. When display updates are detected, it dynamically switches to a high-performance state that ensures adequate display update capability, thus balancing power consumption with productivity
3Speed
If a single processor continuously controls the light source to ensure responsive display updates, then display responsiveness is improved, but power consumption increases
Solution Approach 1:
The patent segments the processor control function into two separate processors: a first processor for high-performance display updates and a second processor for power-saving operation. This segmentation allows the system to use only the necessary processing power at any given time, improving display update speed when needed while reducing overall processor power consumption during static periods
Solution Approach 2:
The system implements multi-functionality by having the second processor handle basic backlight control for static displays, freeing the first processor to focus only on display updates when needed. This universal approach allows either processor to potentially handle control tasks depending on system state, optimizing the balance between responsiveness and power consumption
Data Source
AI summary
An electronic device includes a first processor, a second processor, and a light source. The first and second processors are configured such that the first processor can be shifted from a control state of controlling the light source to a non-control state of not controlling the light source and such that the second processor can be shifted from the non-control state of not controlling the light source to the control state of controlling the light source, along with a shift of the first processor from an operating state to a non-operating state.