Adaptive Inversion Control for LCD Flickering
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Solution Overview
Problem
Liquid crystal displays (LCDs) experience screen flickering due to DC stress when power is abnormally turned off, as charges in pixels are not fully discharged, leading to inconsistent inversion driving modes.
Innovation Solution
Incorporating a power converter and timing controller that change the inversion driving mode from 3-column to dot inversion when power is abnormally turned off, offsetting DC stress by temporarily switching the polarity control signals to prevent flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the liquid crystal display panel is driven in a fixed inversion manner, then the display operates normally under standard conditions, but screen flickering occurs when power is abnormally turned off due to DC stress accumulation
Solution Approach 1:
The patent applies dynamics by making the inversion driving mode changeable based on operating conditions. The system dynamically switches between first inversion mode (e.g., frame inversion) and second inversion mode (e.g., line inversion) depending on whether normal or abnormal power-off conditions occur, allowing the display to adapt to different operational states and prevent DC stress accumulation
Solution Approach 2:
The patent changes the inversion driving parameter (inversion mode) based on power supply status. When abnormal power-off is detected, the system changes from a first inversion mode to a second inversion mode, altering the electrical characteristics applied to liquid crystal pixels to ensure complete charge discharge and eliminate flickering
2Reliability
If the inversion driving mode is changed to offset DC stress, then screen flickering is prevented, but the control complexity increases due to additional power monitoring and mode switching logic
Solution Approach 1:
The patent implements feedback by monitoring the power supply status and detecting abnormal power-off conditions. The power supply unit provides feedback signals to the timing controller about the operational state, enabling the system to automatically detect when abnormal power-off occurs and respond by switching to an appropriate inversion mode to prevent flickering
Solution Approach 2:
The timing controller serves as an intermediary between the power supply unit and the data driver. It receives power status information, determines the appropriate inversion mode, and controls the data driver accordingly, simplifying the overall control architecture by centralizing the decision-making logic in a single component
Data Source
AI summary
A display device is disclosed. The display device includes a liquid crystal display panel; a data driver for driving the liquid crystal display panel in a first inversion manner; a timing controller for controlling the data driver; and a power converter for changing a first power voltage supplied from a power supply unit into a second power voltage and outputting the second power voltage, wherein, when the power of one of the power supply unit and the power converter is turned on after being abnormally turned off, the liquid crystal display panel is driven in a second inversion manner different from the first inversion manner.