Self-Detection Charge Sharing for LCD Power Optimization
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Solution Overview
Problem
Conventional charge sharing techniques in LCD devices are limited to saving power only when voltage polarities are inverted and cannot effectively perform power saving when voltage magnitudes change while maintaining the same polarities.
Innovation Solution
A self-detection charge sharing module that includes detecting units to analyze input and output voltages of operational amplifiers driving data lines and charge sharing units to connect data lines when input voltages with opposite variation directions are detected, allowing for charge sharing even when voltage polarities remain the same.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional charge sharing techniques are used to save power when voltage polarities are inverted, then power consumption is reduced in polarity inversion scenarios, but power saving cannot be achieved when voltage magnitudes change while maintaining the same polarities
Solution Approach 1:
The patent implements dynamic detection of voltage variation tendencies on data lines and dynamically activates charge sharing only when beneficial. The detecting unit continuously monitors voltage changes and the control unit activates charge sharing operations based on real-time conditions, enabling the system to adapt to different operating scenarios (polarity inversion, magnitude change, or no variation) and apply charge sharing selectively, thus achieving both power saving and broad adaptability.
Solution Approach 2:
The patent changes the operational parameters of charge sharing from fixed (only during polarity inversion) to variable based on detected voltage characteristics. By monitoring voltage polarity and magnitude changes, the system adjusts whether to perform charge sharing, thereby extending power saving capabilities across multiple operating conditions including same-polarity magnitude changes while maintaining system efficiency.
2Use of energy by moving object
If charge sharing is performed between data lines to save power, then power consumption decreases, but additional detection and control circuits are required
Solution Approach 1:
The patent merges the voltage detection function with the existing driver circuit operations. The detecting unit utilizes the same signal paths and timing structures already present in the LCD driver, combining multiple functions (driving and monitoring) into integrated circuit blocks rather than adding completely separate systems, thus reducing overall complexity while enabling power saving.
Solution Approach 2:
The detecting unit automatically monitors voltage variations on data lines and the control unit autonomously determines when charge sharing should be activated based on detected patterns. This self-service mechanism eliminates the need for external control signals or complex centralized management, reducing circuit complexity while achieving intelligent power management.
Data Source
AI summary
A self-detection charge sharing module for a liquid crystal display device is disclosed. The self-detection charge sharing module includes at least one detecting unit, for detecting a plurality of input voltages of a plurality of operational amplifiers driving a plurality of data line sand a plurality of output voltage of the plurality of data line, to generate at least one detecting result, and at least one charge sharing unit, for conducting connection between at least one first data line and at least one second data line among the plurality of data line when the at least one detecting result indicates at least one corresponding first input voltage and at least one corresponding second input voltage among the plurality of input voltage have opposite voltage variation direction and vary toward each other. The at least one first input voltage and the at least one second input voltage maintain respective polarities.