Standby Analog Clock Display for Power-Constrained Wearables
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Solution Overview
Problem
Smart watches consume excessive power in standby mode due to continuous display of current time, leading to reduced battery life.
Innovation Solution
A display device with a drive circuit that generates an internal clock signal to display an analog clock in standby mode, using pre-stored end point coordinates of clock hands to minimize power consumption by displaying only essential components like hour and minute hands with adjustable brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display device continuously displays the current time in standby mode, then the current time is always visible, but power consumption increases
Solution Approach 1:
The display device updates the analog clock display periodically rather than continuously refreshing the entire display. The drive circuit generates an internal clock signal that triggers updates only when the time changes, reducing power consumption while maintaining current time visibility. This periodic update mechanism allows the display to remain functional without continuous power expenditure.
Solution Approach 2:
The invention extracts only the essential elements needed for time display (analog clock with hour and minute hands) from the full display functionality. By displaying only the minimal necessary information through simple analog hands rather than complex digital representations or additional interface elements, the power consumption is reduced while maintaining the core function of showing current time.
2Loss of information
If the display device displays a full digital clock interface, then complete time information is shown, but power consumption and device complexity increase
Solution Approach 1:
The invention extracts only the essential elements needed for time display (analog clock with hour and minute hands) from the full display functionality. By displaying only the minimal necessary information through simple analog hands rather than complex digital representations or additional interface elements, the power consumption is reduced while maintaining the core function of showing current time.
Solution Approach 2:
The drive circuit uses pre-stored end point coordinates of clock hands to generate the analog clock display. Instead of calculating and rendering complex clock graphics in real-time, the system copies and displays simplified line representations defined by stored coordinate points, significantly reducing computational complexity while maintaining time display functionality.
3Measurement precision
If the display device updates the clock display frequently, then the current time is always accurate, but power consumption increases
Solution Approach 1:
The display device updates the analog clock display periodically rather than continuously refreshing the entire display. The drive circuit generates an internal clock signal that triggers updates only when the time changes, reducing power consumption while maintaining current time visibility. This periodic update mechanism allows the display to remain functional without continuous power expenditure.
Solution Approach 2:
The drive circuit generates an internal clock signal in advance to determine current hour and minute coordinates before displaying them. By pre-calculating the hand positions based on stored end point coordinates and the internal clock signal, the system ensures accurate time display without requiring frequent high-power updates, as the next display state is prepared in advance.
Data Source
AI summary
A display device includes a display panel including a plurality of pixels and a drive circuit which displays an image, which corresponds to input data received from outside, on the display panel in a normal operation mode, and displays an image, which corresponds to an analog clock representing a current time, on the display panel based on end point coordinates of clock hands that are internally stored in the drive circuit in a standby mode.