Display Time Update via Broadcast Signal Extraction
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Solution Overview
Problem
Conventional display apparatuses fail to maintain accurate time information during blackouts or power outages, leading to disrupted timed recording and alarm functions, and require additional battery backup systems, increasing material costs.
Innovation Solution
A display apparatus and method that utilize a broadcast signal as a background operation to extract and update time information, employing a controller with a sub-controller and main controller to power the tuner and extract time information from a transport stream signal using a program clock reference value, activating the RTC module and setting timed recording/alarm schedules without the need for additional batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a battery is disposed around the RTC module to maintain time information during blackout, then time information reliability is improved, but material costs and device complexity increase
Solution Approach 1:
The patent introduces a broadcast signal as an intermediary source to update time information in the RTC module. Instead of relying on a battery to maintain time during blackout, the system uses broadcast signals (when available) to periodically update the RTC, thereby eliminating the need for battery backup while maintaining time accuracy.
Solution Approach 2:
The system performs self-updating of time information by automatically receiving and processing broadcast signals. The controller autonomously extracts time information from the broadcast signal and updates the RTC module without requiring user intervention or additional power backup components.
2Reliability
If a battery is disposed around the RTC module to maintain time information during blackout, then time information reliability is improved, but material costs increase
Solution Approach 1:
The broadcast signal serves as an intermediary that provides time information updates without requiring physical battery components. This eliminates material costs associated with batteries while maintaining reliable timekeeping through periodic updates from external broadcast sources.
Solution Approach 2:
The system replaces expensive, finite battery resources with a free, renewable broadcast signal source. The broadcast signal provides continuous time updates without depletion, eliminating the need for periodic battery replacement and reducing overall material costs.
3Measurement precision
If power is supplied to the tuner and main controller to extract time information from broadcast signal, then time information accuracy is improved, but power consumption increases
Solution Approach 1:
The system employs periodic action by only activating the tuner and main controller when broadcast signals are available and needed for time updates. The sub-controller manages power by selectively powering these components during specific intervals rather than continuously, thereby maintaining time accuracy while minimizing overall power consumption.
Solution Approach 2:
The sub-controller preliminarily determines whether broadcast signals are available before activating the tuner and main controller. This preliminary check prevents unnecessary power consumption by only activating these power-intensive components when actually needed for time information extraction.
Data Source
AI summary
A display apparatus and a method for updating time information thereof are provided. The display apparatus includes a display, a power supply configured to supply power to a controller in response to alternating current (AC) power being supplied to the display apparatus, a tuner configured to receive a broadcast signal from an external source, and a controller configured to control the power supply to supply power to the tuner, to extract time information from the broadcast signal received from the tuner, and to update time information of the display apparatus based on the extracted time information, in response to AC power supply to the display apparatus being detected.