Display Device IR Wakeup Detection for Low-Power External-Noise Control
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Solution Overview
Problem
Existing display devices face challenges in minimizing power consumption while preventing malfunctions due to external noise signals containing IR components, and in accurately distinguishing between IR signals from remote controls and external noise.
Innovation Solution
A display device with a micro control unit (MCU) that operates in low power or active power modes, capable of detecting a wakeup signal from an IR signal to switch power modes and maintain active mode when a valid IR signal is received, thereby reducing power consumption and preventing malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the TV operates in active mode for minimum time period in low power mode, then power consumption is reduced, but IR signal from remote control may be missed
Solution Approach 1:
The system performs preliminary action by detecting a first IR signal during the minimum active time period before the TV fully wakes up. This preliminary detection triggers a faster wake-up process, allowing the TV to receive subsequent IR signals reliably without requiring continuous active operation, thus reducing power consumption while maintaining reception reliability.
2Reliability
If the TV releases low power mode upon detecting first IR signal, then IR signal reception is enabled, but malfunction may occur due to other external IR signals
Solution Approach 1:
The system uses feedback by monitoring whether a second IR signal is actually received after detecting the first IR signal. If no second signal is received within a predetermined time, the TV returns to low power mode. This feedback mechanism ensures the TV only remains in active mode when necessary, preventing malfunctions from external noise while maintaining reliable IR signal reception.
Solution Approach 2:
The system applies dynamics by making the TV's power mode flexible and adaptive rather than static. The TV dynamically transitions between low power mode and active mode based on real-time IR signal detection results, allowing it to respond to actual reception needs while minimizing exposure to external noise interference.
3Reliability
If the TV continuously operates in active mode, then IR signal reception is reliable, but power consumption increases
Solution Approach 1:
The system implements periodic action by having the TV operate in alternating cycles of low power mode and active mode. During each cycle, the TV briefly activates to detect IR signals, then returns to low power mode unless signals are received. This periodic operation maintains reliable IR signal reception capability while significantly reducing overall power consumption compared to continuous active operation.
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
The solution effectively reduces power consumption by maintaining the active mode only when a valid IR signal is detected, preventing malfunctions due to external noise, and optimizing power mode switching based on IR signal reception.
Implementation Method 1
a micro control unit configured to receive an IR signal and to operate in a low power mode or an active power mode
Data Source
AI summary
A display device may include a micro control unit configured to receive an IR signal and to operate in a low power mode or an active power mode, and may determine whether a wakeup signal is detected from the IR signal while the micro control unit operates in the low power mode and switch a power mode of the micro control unit from the low power mode to the active power mode when the wakeup signal is detected.