Display Panel Driving Method for Ghost Effect Reduction
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Solution Overview
Problem
The preliminary charging method in liquid crystal display (LCD) devices often results in over-charging of pixels when the grayscale of previous data is significantly greater than the grayscale of present data, leading to a higher brightness level than desired, causing a ghost effect.
Innovation Solution
A method of driving a display panel that involves charging pixels with compensated data during a first charging period if the previous data's grayscale is greater than the present data's grayscale, and adjusting the gate voltage level during charging periods to alleviate the ghost effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If preliminary charging method is used to improve charging rate, then charging speed is improved, but ghost effect occurs when previous grayscale is much greater than present grayscale
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the gate voltage level during different charging periods based on the grayscale difference between previous and present data. When the grayscale difference exceeds a threshold, the gate voltage is set to a first level during a first charging period, and adjusted to a second level during a second charging period, thereby preventing over-charging and ghost effect while maintaining fast charging rate
Solution Approach 2:
The patent implements dynamics by making the gate voltage adaptive rather than fixed. The gate driver dynamically changes the gate voltage level based on real-time detection of grayscale differences between consecutive frames, allowing the charging process to adapt to varying display conditions and prevent ghost effect in dynamic viewing scenarios
2Device complexity
If fixed gate voltage is used during charging, then device complexity is reduced, but display quality deteriorates due to inability to compensate for grayscale differences
Solution Approach 1:
The patent transforms the static gate voltage into a dynamic parameter that adapts to grayscale differences. The gate driver compares previous and present grayscale values and adjusts the gate voltage accordingly, adding intelligent control without significantly increasing hardware complexity
Solution Approach 2:
The patent implements feedback by having the gate driver detect and compare grayscale differences between consecutive frames, then use this information to adjust the gate voltage in real-time. This closed-loop control ensures accurate brightness representation while maintaining manageable system 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
This approach effectively reduces the ghost effect by ensuring accurate brightness levels are maintained, thereby improving display quality by compensating for the difference in grayscales between previous and present data.
Implementation Method 1
a liquid crystal display ('LCD') apparatus includes a first substrate including a pixel electrode, a second substrate including a common electrode and a liquid crystal layer disposed between the first and second substrates. An electric field is generated by voltages applied to the pixel electrode and the common electrode. By adjusting an intensity of the electric field, a transmittance of a light passing through the liquid crystal layer may be adjusted
Data Source
AI summary
A method of driving a display panel includes charging a pixel with first data during a first charging period, comparing a first grayscale of the first data and a second grayscale of second data, charging the pixel with compensated data during a second charging period if the first grayscale is greater than the second grayscale, and charging the pixel with the second data during a third charging period.