Dynamic Pixel Inversion for LCD Image Sticking Prevention
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Solution Overview
Problem
Liquid crystal display (LCD) devices suffer from an image sticking effect due to elastic fatigue of liquid crystal molecules when displaying a steady image for an extended period, leading to unpleasant afterimages.
Innovation Solution
A method and system that dynamically rotate pixel molecules using a pixel inversion process during a predetermined time interval when the image tone status is steady, and suspend the rotation when the status becomes unstable, thereby preventing elastic fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If liquid crystal molecules are driven by DC power for a long time, then the display can maintain steady image, but the liquid crystal molecules become elastically fatigued causing image sticking effect
Solution Approach 1:
The patent applies periodic action by implementing a pixel inversion process that periodically rotates pixel molecules after a predetermined time interval. This periodic inversion prevents continuous elastic fatigue accumulation by reversing the molecular orientation, thereby maintaining pixel molecule elasticity while enabling long-duration steady image display.
Solution Approach 2:
The patent applies preliminary action by detecting the color tone status in advance and performing pixel inversion before elastic fatigue reaches a critical level. The system monitors the display state and proactively inverts pixels when steady state is detected, preventing image sticking effect before it occurs.
2Reliability
If pixel inversion process is continuously applied, then image sticking effect is avoided, but display complexity increases
Solution Approach 1:
The patent applies feedback by monitoring the color tone status of the displayed image and using this information to control the pixel inversion process. The system continuously detects whether the image is in steady state and adjusts the inversion timing accordingly, which simplifies control logic by avoiding unnecessary inversions during dynamic content display.
Solution Approach 2:
The patent applies parameter changes by adjusting the inversion timing based on the detected color tone status. When steady state is detected, the system inverts pixels after a predetermined time interval; when dynamic content is detected, the system delays or skips inversion, thereby optimizing the balance between preventing image sticking and reducing control complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively avoids image sticking effects by maintaining pixel molecule elasticity, preventing the display of unwanted patterns and afterimages.
Implementation Method 1
The electro-optical effect refers to a transformation from certain allocations of the liquid crystal molecules to other allocations of the liquid crystal performed by using an electric field, thereby resulting variations of optical characteristics of a liquid crystal film of the display panel.
Implementation Method 2
The optical rotation property refers to a rotation of a polarization plane of each liquid crystal molecule when an optical signal passes through the liquid crystal molecules.
Data Source
AI summary
A method for avoiding an image sticking effect includes acquiring a color tone status of an image during a predetermined time interval according to an input signal of a liquid crystal display panel, rotating pixel molecules of at least one region of a plurality of regions of the image by using a pixel inversion process when the color tone status is maintained at a steady state, and after the pixel molecules of the at least one region of the image are rotated, suspending the pixel inversion process of the image when the color tone status is changed from the steady state to an unstable state.