Display Power Sequencing for User-Presence Energy Saving
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Solution Overview
Problem
Display devices face significant power consumption challenges when users temporarily leave the display area without activating sleep modes, leading to unnecessary energy usage.
Innovation Solution
A driving control apparatus that sequentially outputs a backlight stop signal followed by a voltage stop signal when the user leaves, and reversely outputs a voltage start signal followed by a backlight start signal when the user returns, along with a discharge enabling signal to release electric charge, thereby optimizing power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display device remains in power-on state without sleep mode activation, then the display functionality is maintained, but unnecessary power consumption occurs
Solution Approach 1:
The patent implements dynamic power management by transitioning the display device between different operational states (normal operation, sleep mode, and off state) based on user presence detection. The system dynamically adjusts power consumption levels while maintaining display functionality when needed, resolving the contradiction between reliability and energy usage.
Solution Approach 2:
The patent employs feedback mechanisms through user presence detection (via sensors or cameras) to trigger appropriate power management actions. The system continuously monitors user presence and adjusts power states accordingly, ensuring display functionality is maintained when users are present while reducing power consumption when users leave.
2Loss of energy
If the backlight stops first followed by voltage stop, then power consumption is reduced efficiently, but display abnormality may occur during transition
Solution Approach 1:
The patent implements preliminary actions by implementing a discharge enabling signal that activates before the backlight stops to pre-discharge pixel electrode charges. This preliminary charge discharge prevents display abnormalities during the transition to sleep mode while maintaining efficient power consumption reduction.
Solution Approach 2:
The patent applies preliminary anti-action by using the discharge enabling signal to counteract potential display abnormalities before they occur. The charge discharge mechanism prevents residual charges from causing display artifacts during the power transition, thereby maintaining display reliability while achieving energy savings.
3Reliability
If the discharge enabling signal is output before voltage stop signal, then electric charge is released preventing abnormal display, but additional control complexity is introduced
Solution Approach 1:
The patent merges the discharge enabling signal control with the existing power management circuitry. The discharge enabling signal is integrated into the control sequence alongside backlight and voltage control signals, consolidating multiple functions into a coordinated control mechanism without significantly increasing overall system complexity.
Data Source
AI summary
A driving control apparatus, a driving control method and a display apparatus. When a display panel is in a power-on state and it is determined that a user leaves the display panel, a backlight stop signal (VBN) is first output, and a voltage stop signal (VPN) is then output. A backlight control circuit (320) stops operating in response to the backlight stop signal. In response to the voltage stop signal, a power switching circuit (330) stops outputting a driving voltage for driving the display panel to display a picture. When determining that the user returns to the front of the display panel, a voltage start signal (VPQ) can first be output, and a backlight start signal (VBQ) is then output. The backlight control circuit starts to operate in response to the backlight start signal. The power switching circuit outputs the driving voltage in response to the voltage start signal.