LCD Charge Sharing Control for Power Reduction
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Solution Overview
Problem
Existing liquid crystal display (LCD) devices with charge sharing functions face limitations in reducing power consumption, as charge sharing is unnecessarily performed when pixel data voltages have the same polarity and not performed sufficiently when they have different voltage levels, leading to suboptimal power savings.
Innovation Solution
An LCD with a charge sharing unit that selectively allows data lines to share charges only between periods where pixel data voltages of the same polarity are supplied to adjacent pixels, and a charge sharing controller that skips charge sharing when pixel data voltages of the same level are consecutive, ensuring efficient power management by modifying the polarity signal and using a charge sharing control signal to control the sharing operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If charge sharing is performed in all periods, then power consumption is reduced through charge sharing, but unnecessary charge sharing occurs when pixel data voltages have the same polarity, wasting energy
Solution Approach 1:
The charge sharing function is made dynamic by selectively enabling or disabling it based on the polarity of pixel data voltages. The controller dynamically adjusts the charge sharing operation to occur only when adjacent pixels have different polarities, optimizing power consumption while adapting to varying display content requirements.
Solution Approach 2:
The system implements feedback control by monitoring the polarity of pixel data voltages and using this information to control the charge sharing operation. The controller receives pixel data, determines polarity relationships, and adjusts charge sharing accordingly, creating a closed-loop system that optimizes power consumption based on actual display content.
2Productivity
If charge sharing is skipped when voltages are the same, then unnecessary operations are avoided, but charge sharing may not occur sufficiently when voltage levels differ, reducing power savings
Solution Approach 1:
The charge sharing operation is dynamically controlled based on real-time polarity detection of pixel data voltages. The system adapts its behavior to the specific display content, enabling charge sharing only when it will be effective (different polarities) and disabling it when unnecessary (same polarity), thereby optimizing both efficiency and power savings.
Solution Approach 2:
The system changes the operational parameter of charge sharing based on the polarity parameter of pixel data voltages. By detecting polarity changes and adjusting the charge sharing function accordingly, the system optimizes power consumption while maintaining display quality across different voltage conditions.
Data Source
AI summary
A liquid crystal display device with a charge sharing function is suitable for reducing the power consumption below a predetermined limit. In the liquid crystal display device, a pair of pixels adjacent along the data line is charged with pixel data voltages of polarity opposite to that of another pair of pixels adjacent to the pair of the pixels. A charge sharing unit selectively allows the data lines to share charges at intervals between periods in which the pixel data voltages are supplied to the pair of the pixels adjacent along the data line.