Display Device Power Control via Time-Division Multiplexing
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Solution Overview
Problem
Display devices consume excessive power as both display and touch sensing blocks operate simultaneously, leading to increased power consumption, even when only one function is required.
Innovation Solution
Implementing a dynamic power control system using a microcontroller and power management integrated circuit to generate synchronization signals that allow display and touch sensing circuits to operate with low power during alternate time sections, with shared voltage levels adjusted based on operation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both display and touch sensing blocks operate simultaneously, then both functions can be performed, but power consumption increases significantly
Solution Approach 1:
The patent implements time-division multiplexing where the display panel alternates between display mode and touch sensing mode in periodic time sections. During display time sections, the display circuit operates while the touch sensing circuit is in low power mode. During touch sensing time sections, the touch sensing circuit operates while the display circuit is in low power mode. This periodic switching resolves the contradiction by ensuring only one circuit operates at full power at any given time, significantly reducing overall power consumption while maintaining both functional capabilities.
Solution Approach 2:
The patent dynamically adjusts the operation state of display and touch sensing circuits based on real-time operational requirements. A controller generates control signals that switch the operational mode of each circuit according to whether display or touch sensing is the active function. This dynamic control allows the system to adapt its power consumption profile to match actual functional needs, preventing unnecessary power consumption when only one function is required.
2Reliability
If all blocks operate at full power regardless of operation type, then functional performance is maintained, but unnecessary power is consumed
Solution Approach 1:
The patent applies different operational states to different circuits based on their current functional requirements. Instead of uniformly operating all blocks at full power, the display circuit is placed in low power mode during touch sensing operations, and the touch sensing circuit is placed in low power mode during display operations. This localized quality adjustment ensures each circuit operates at the appropriate power level for its current task, eliminating unnecessary power consumption while maintaining functional performance where needed.
3Use of energy by moving object
If time-sharing method is used for display and touch sensing, then power consumption is reduced, but circuit switching control complexity increases
Solution Approach 1:
The patent merges the control functions for time-division multiplexing into a single controller that generates both display control signals and touch sensing control signals. This unified controller coordinates the switching of both circuits, managing the complexity centrally rather than requiring separate control mechanisms for each circuit. By combining control functions, the patent reduces overall system complexity while maintaining the power-saving benefits of time-sharing operation.
Data Source
AI summary
The present disclosure, which relates to a technology for controlling power of a display device, allows reducing power consumption by driving circuits for a display operation and circuits for a touch sensing operation with low power depending on a display operation or a touch sensing operation of a display panel.