Electronic Device Display Gating to Prevent Noise Activation
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Solution Overview
Problem
Electronic devices in power-saving mode can inadvertently turn on the display due to noise interference on control signal lines, leading to unnecessary power consumption and display activation.
Innovation Solution
Incorporating a gate portion on the control signal path that allows the second control signal to pass only when a first control signal is active, preventing noise-induced display activation during power-saving mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the display portion is turned off during power-saving mode to reduce power consumption, then power consumption is reduced, but the display may be inadvertently activated by noise interference on control signal lines
Solution Approach 1:
An AND gate circuit is introduced as an intermediary component between the main control portion and the sub control portion. The AND gate receives two input signals: the second control signal from the main control portion and a detection signal from the operation portion. The display is activated only when both inputs are high, preventing noise-induced false activation while maintaining power-saving mode functionality
Solution Approach 2:
The system performs preliminary detection of operation portion status before allowing display activation. The detection signal is prepared in advance at the operation portion, and the AND gate evaluates both the control signal and detection signal before permitting display activation, ensuring that noise alone cannot trigger display activation during power-saving mode
Data Source
AI summary
An electronic device including a display portion, a first control portion, a second control portion, and a gate portion. Light of the display portion is turned off while the electronic device is operating in a power-saving mode. The first control portion outputs a first control signal when a user operation is accepted in an operation portion while the electronic device is operating in the power-saving mode. The second control portion outputs, in accordance with an input of the first control signal, a second control signal that instructs to light the display portion. The gate portion allows the second control signal to pass when the first control signal is output, and does not allow the second control signal to pass when the first control signal is not output.