Input Output Device Power Reduction via Adaptive Photodetection Modes
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Solution Overview
Problem
Conventional input/output devices experience high power consumption due to unnecessary rewriting of image data and frequent reading of light intensity by photodetector circuits, even when no change occurs in illuminance, leading to inefficient energy use.
Innovation Solution
The input/output device incorporates a switching mechanism between different photodetection and display modes, reducing the number of driven photodetector and display circuits as needed, using data generated by photodetection operations to optimize power consumption without affecting operational convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photodetector circuits continuously read light intensity data every several milliseconds to several tens of milliseconds, then the position-sensing function and detecting function are maintained, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the photodetector circuit operation flexible and adaptive. The system dynamically adjusts between continuous operation mode (first photodetection mode) and reduced operation mode (second photodetection mode) based on whether position sensing is actually needed. This dynamic switching allows the system to maintain reliability when required while reducing power consumption during static display periods.
Solution Approach 2:
The patent changes the operational parameters of the photodetector circuits by switching between two distinct modes: a first mode with full photodetection capability and a second mode with reduced photodetector circuit operation. This parameter change enables the system to adapt power consumption levels according to functional requirements.
2Reliability
If image data is continuously rewritten even for still images, then the display circuit maintains image quality, but unnecessary power consumption occurs
Solution Approach 1:
The display circuit operation is made dynamic through switching between a first display mode (continuous rewriting) and a second display mode (stopped rewriting). The system adapts its operation based on whether image updates are necessary, maintaining display quality when needed while eliminating unnecessary power consumption during static display periods.
Solution Approach 2:
The system uses photodetection data to automatically determine when display rewriting is necessary, enabling self-service control. The photodetector circuits monitor for changes in the display area, and based on this self-monitoring, the system automatically switches between display modes without external intervention, optimizing power consumption while maintaining display quality.
3Measurement precision
If reading operations are performed in all photodetector circuits even when no change occurs in illuminance, then complete monitoring coverage is maintained, but unnecessary power consumption increases
Solution Approach 1:
The patent applies local quality by making photodetector circuit operation location-specific and condition-specific. In the second photodetection mode, not all photodetector circuits operate continuously - only those where changes are detected or where position sensing is needed. This localized operation maintains monitoring precision where required while reducing overall power consumption.
Solution Approach 2:
The system performs partial photodetection action by operating fewer photodetector circuits in the second mode rather than all circuits. This partial action is sufficient for maintaining position-sensing functionality and detecting function while avoiding the excessive power consumption of full-coverage continuous monitoring.
4Use of energy by moving object
If the input/output device is switched to display mode using photodetection data, then power consumption is reduced, but operational convenience must be maintained
Solution Approach 1:
The system uses feedback from photodetector circuits to automatically control mode switching. The photodetector data provides feedback about whether changes are occurring in the display area or position sensing is needed, and this feedback automatically triggers appropriate mode transitions. This feedback mechanism ensures operational convenience is maintained while achieving power savings.
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 approach significantly reduces power consumption by selectively switching between photodetection and display modes based on data changes, maintaining operational efficiency and convenience.
Implementation Method 1
a photodetector circuit being supplied with a photodetection reset signal and an output selection signal, being reset in accordance with the photodetection reset signal, generating data according to an intensity of light entering the photodetector circuit
Data Source
AI summary
An object is to reduce power consumption. An input/output device including: a display selection signal output circuit outputting a display selection signal during a first display mode and stopping outputting the display selection signal during a second display mode; a photodetection reset signal output circuit outputting N (N is a natural number) photodetection reset signals during a first photodetection mode and outputting M (M is a natural number smaller than N) photodetection reset signals during a second photodetection mode; an output selection signal output circuit outputting N output selection signals during the first photodetection mode and outputting M output selection signals during the second photodetection mode; and a photodetector circuit being reset in accordance with a photodetection reset signal, generating data according to an intensity of light entering the photodetector circuit subsequently, and outputting the data as a data signal in accordance with the output selection signal.