Liquid Crystal Display Driving Method for Brightness Uniformity
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Solution Overview
Problem
Liquid crystal display devices using black-data insertion driving methods experience brightness differences between the upper and middle/lower portions of the display panel due to varying charge conditions caused by polarity inversion signals.
Innovation Solution
The method involves delaying the black-data gate driving signal by one gate driving signal input time to ensure that the black data and image data are inputted with the same polarity across the panel, maintaining a uniform 'strong' charge condition and eliminating brightness differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If black-data insertion driving method is used to improve image quality, then image quality is improved, but brightness difference occurs between upper and middle/lower portions of display panel
Solution Approach 1:
The patent applies preliminary action by delaying the black-data gate driving signal to ensure that black data is inputted with the same polarity as image data before the polarity inversion occurs. This preliminary timing adjustment prevents the brightness difference problem from occurring in the first place by establishing uniform charge conditions across the display panel before the polarity change happens.
Solution Approach 2:
The patent changes the timing parameter of the black-data gate driving signal by delaying it by one gate driving signal input time. This parameter change ensures that the black data and image data are inputted with the same polarity, thereby maintaining uniform charge conditions and eliminating brightness differences between different portions of the display panel.
2Productivity
If polarity inversion is applied to improve display performance, then display performance is improved, but brightness difference is caused due to varying charge conditions
Solution Approach 1:
The patent performs preliminary action by adjusting the timing of the black-data gate driving signal before the polarity inversion takes effect. By delaying the signal, the system ensures that black data is charged with the same polarity as the subsequent image data, preventing brightness differences before they can occur during the polarity inversion process.
Solution Approach 2:
The patent applies preliminary anti-action by counteracting the potential brightness difference problem before it occurs. The delay in the black-data gate driving signal prevents the formation of different charge conditions that would lead to brightness differences, thereby counteracting the harmful effect of polarity inversion on brightness uniformity.
Data Source
AI summary
A driving method of a liquid crystal display device includes steps of providing image data to a liquid crystal panel each frame, providing an image-data gate driving signal to the liquid crystal panel and inputting the image data to the liquid crystal panel, providing black data to the liquid crystal panel, providing a black-data gate driving signal to the liquid crystal panel and inputting the black data to the liquid crystal panel, and delaying the black-data gate driving signal when each frame starts.