Green Pixel Pre-Charging for LCD Luminance Uniformity
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Solution Overview
Problem
Liquid crystal display devices experience inferior picture quality in super pixel gray patterns due to uneven luminance among green pixel cells, caused by variable charging conditions.
Innovation Solution
A liquid crystal display device and method where data is supplied to green pixel cells under the same charging condition, with the data line connected to the green pixel cell being previously charged with data corresponding to the adjacent black pixel cell, ensuring uniform luminance and preventing luminance differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If data is supplied to green pixel cells using shared data lines with variable charging conditions, then the data supply process is simplified, but luminance uniformity among green pixel cells deteriorates
Solution Approach 1:
The patent applies preliminary action by charging the data line with black pixel data before supplying green pixel data. This pre-charging action ensures that the data line starts from a known state, eliminating variable charging conditions and ensuring uniform luminance across all green pixel cells while maintaining the simplicity of shared data lines
2Device complexity
If shared data lines are used for multiple pixel cells, then the number of data lines is reduced, but charging conditions become variable causing picture quality deterioration
Solution Approach 1:
The patent maintains the advantage of using fewer shared data lines while eliminating picture quality issues by implementing a pre-charging step. The data line is charged with black pixel data before green pixel data is supplied, ensuring consistent charging conditions across all pixel cells that share the same data line, thus maintaining reliability without increasing device complexity
3Productivity
If green pixel cells are driven without pre-charging data lines, then the driving sequence is simplified, but luminance differences occur causing inferior picture quality
Solution Approach 1:
The patent adds a pre-charging action to the driving sequence that does not significantly complicate the overall process. By charging the data line with black pixel data before green pixel data in a systematic sequence, the patent ensures uniform luminance while maintaining efficient productivity through automated sequential operation
Data Source
AI summary
A liquid crystal display device and a method of driving the same are discussed. The liquid crystal display device according to an embodiment comprises a liquid crystal panel including a plurality of pixel units arranged in a matrix configuration; red, green and blue pixel cells provided in the pixel units respectively; a data driver to supply data to pixel cells included in each pixel unit, so as to realize the adjacent pixel units displayed with black and white; and a gate driver to drive the pixel cells included in each pixel unit, so as to make the green pixel cell in the pixel unit of displaying the white supplied with corresponding data under condition of that a data line connected to the corresponding green pixel cell is previously charged with the data corresponding to the pixel cell included in the pixel unit of displaying the black.