Liquid Crystal Display Timing Controller Polarity Inversion
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Solution Overview
Problem
Liquid crystal display devices experience afterimages and flicker due to shifts in common voltage, particularly when displaying fixed patterns for extended periods, which degrade output quality and user satisfaction.
Innovation Solution
A liquid crystal display device with a gate driver, data driver, and timing controller that alternately inverts the polarity of the data voltage at predetermined periods to control the gate and data signals, preventing common voltage shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a fixed pattern is displayed for a long time, then the display can maintain a stable image, but the common voltage shifts causing afterimages and flicker
Solution Approach 1:
The patent applies periodic polarity inversion to the data voltage signal. The timing controller inverts the polarity of the data voltage at predetermined periods (e.g., every 1 second, 3 seconds, or 5 seconds) regardless of the image content. This periodic action prevents the common voltage from drifting during fixed pattern display by periodically resetting the voltage balance, thereby eliminating afterimages and flicker while maintaining stable image display for extended durations.
2Reliability
If the polarity of data voltage is inverted frequently, then common voltage stability is improved, but image quality may deteriorate due to excessive polarity changes
Solution Approach 1:
The patent implements periodic polarity inversion at predetermined time intervals (such as every 1 second, 3 seconds, or 5 seconds) rather than at every frame or line. This periodic approach provides sufficient common voltage stabilization while avoiding excessive polarity changes that would degrade image quality. The predetermined period is optimized to balance voltage stability with image quality preservation.
3Object-generated harmful factors
If polarity inversion is applied continuously, then afterimages are reduced, but power consumption increases
Solution Approach 1:
The patent employs periodic polarity inversion at predetermined time intervals rather than continuous inversion. This approach effectively reduces afterimages and flicker by periodically correcting common voltage drift, while consuming significantly less power compared to continuous polarity inversion. The predetermined period is carefully selected to achieve the minimum necessary inversion frequency for afterimage suppression.
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 suppresses afterimages and flicker even when fixed patterns are displayed for long times, improving display quality and user experience by stabilizing the common voltage.
Implementation Method 1
a liquid crystal display device that obtains a desired image signal by applying a voltage to a liquid crystal material having an anisotropic dielectric constant injected between two substrates and controlling the intensity of this voltage to control the amount of light transmitted through the substrate
Implementation Method 2
when a voltage is applied to the liquid crystal, the arrangement of the liquid crystal is changed, light is transmitted through the liquid crystal in this state to generate diffraction and then is polarized to output the desired image
Implementation Method 3
light is transmitted through the liquid crystal in this state to generate diffraction and then is polarized to output the desired image
Data Source
AI summary
An embodiment of the present disclosure provides a liquid crystal display device for improving an afterimage or flicker, the liquid crystal display device comprising: a display panel where a plurality of gate lines and a plurality of data lines are formed, and including a plurality of pixels; a gate driving unit for applying a gate signal to the plurality of gate lines; a data driving unit for applying a data voltage to the plurality of data lines, and a timing controller for generating a gate driving signal and a data driving signal corresponding to image data, modifying the generated data driving signal such that the polarity of the data voltage is reversed alternately for each per-determined frame unit with respect to the generated data driving signal, applying the generated gate driving signal to the gate driving unit, and applying the modified data driving signal to the data driving unit.