LCD Data Driver Power Mode Switching for Vertical Blank Intervals
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Solution Overview
Problem
LCD devices experience unnecessary power consumption due to continuous use of a fixed power mode during both active and vertical blank intervals, leading to increased heating and power consumption, despite efforts like charge share control and power control schemes.
Innovation Solution
Implementing a power mode control option that detects the vertical blank interval to switch the data driver to a low power mode, using a first consumption power during this interval and a second power mode during active intervals, thereby controlling the current applied to the output buffer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the data driver operates at a fixed power mode during both active and vertical blank intervals, then the display function is maintained, but unnecessary power consumption occurs during vertical blank intervals
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed power mode to a dynamic power mode that adapts to different operating intervals. The data driver automatically switches between a first power mode during active intervals and a second power mode during vertical blank intervals, allowing the system to optimize power consumption based on real-time operational requirements while maintaining display functionality.
Solution Approach 2:
The patent changes the power mode parameter based on the operating interval. During active intervals, the data driver operates in a first power mode with higher current consumption to ensure proper signal levels for data transmission. During vertical blank intervals, it switches to a second power mode with reduced current consumption, thereby reducing overall power usage without affecting display performance.
2Use of energy by moving object
If charge share control and power control schemes are applied, then power consumption is reduced, but the same power is consumed during vertical blank intervals as during active intervals
Solution Approach 1:
The patent segments the operating interval into two distinct periods: active intervals and vertical blank intervals. By detecting the vertical blank interval and applying different power modes to each segment, the system avoids unnecessary power consumption during periods when data transmission is not required, thereby reducing overall energy loss.
Solution Approach 2:
The patent implements periodic action by rhythmically switching between power modes according to the periodic nature of video signal transmission. The data driver alternates between the first power mode during active intervals and the second power mode during vertical blank intervals, creating a periodic power consumption pattern that aligns with the display refresh cycle and minimizes energy waste.
Data Source
AI summary
An LCD device and a driving method thereof are disclosed. The LCD device includes a data driver, a detection unit, and a power mode control option generation unit. The data driver controls a consumption power of an output buffer which outputs an image data signal to a liquid crystal display panel. The detection unit detects a low power driving mode interval for driving the data driver at a first consumption power. The power mode control option generation unit transfers a second power mode control option to the data driver during an interval other than the low power driving mode interval, and transfers a first power mode control option to the data driver during the low power driving mode interval.