Mobile Display Standby Mode for Low-Power Fast Wake-Up
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Solution Overview
Problem
Display devices experience high latency when transitioning from a sleep mode to a normal mode due to a full power-on sequence, which increases power consumption and wake-up time.
Innovation Solution
Implementing a standby mode that reduces power consumption by disabling source amp and multiplexer circuits, using a panel inspection circuit for data voltage, and reducing refresh rate, allowing quick transitions to a normal mode upon detecting user input or tilt events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display enters sleep mode to reduce power consumption, then power consumption is reduced, but wake-up latency increases due to full power-on sequence
Solution Approach 1:
The patent segments the display operation into three distinct modes: normal mode (full functionality), standby mode (reduced functionality with uniform color display), and sleep mode (completely off). This segmentation allows the display to transition through intermediate states, reducing the latency penalty of going from sleep to full functionality by first entering a low-power standby state that maintains basic display capability.
Solution Approach 2:
The display performs preliminary action by maintaining a uniform color display in standby mode, which prepares the pixel circuitry and timing sequences for rapid transition to normal mode. The scan and emission line timing is pre-established in standby mode, so when wake-up is needed, the display can quickly transition without requiring a complete power-on sequence, thus reducing wake-up latency.
2Ease of operation
If the display operates in normal mode continuously, then responsiveness to user input is maintained, but power consumption increases
Solution Approach 1:
The patent implements dynamic mode switching that adapts display functionality to usage conditions. The system transitions between normal mode, standby mode, and sleep mode based on detected user interactions and usage patterns. This dynamic adjustment allows the display to maintain high responsiveness during active use while automatically reducing power consumption during idle periods, optimizing the trade-off between performance and energy efficiency.
3Reliability
If the display uses full power-on sequence to wake from sleep mode, then display functionality is fully restored, but transition time increases
Solution Approach 1:
The standby mode performs preliminary initialization of the display timing sequences and pixel circuitry while maintaining a uniform color display. This preliminary action ensures that when the display needs to wake up, the necessary timing sequences are already established, allowing for rapid transition to normal mode without requiring a complete power-on sequence, thus reducing transition time while maintaining full functionality.
Solution Approach 2:
Standby mode acts as an intermediary state between sleep mode and normal mode. Rather than transitioning directly from sleep to full functionality (which requires a complete power-on sequence), the display first enters standby mode with reduced functionality, then quickly transitions to normal mode. This intermediary state reduces the overall transition time while ensuring full functionality is restored.
Data Source
AI summary
In general, the subject matter described in this disclosure can be embodied in methods, systems, and program products for operating a display device. A method of operating a display of a mobile computing device includes transitioning the display of the mobile computing device from a sleep mode to a standby display mode in response to detecting that the mobile computing device tilted by an initial amount; transitioning the display of the mobile computing device from the standby display mode to a normal display mode in response to detecting that the mobile computing device has tilted an additional amount of tilt by a threshold amount of time, the mobile computing device being configured to transition the display from the standby display mode to the sleep mode in response to detecting that the mobile computing device did not tilt the additional amount of tilt by the threshold amount of time.