LCD Green Pixel Brightness Uniformity via Data Line Polarity
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Solution Overview
Problem
Liquid crystal display (LCD) devices face a brightness difference issue between pixels, particularly noticeable in green pixels, which affects image quality due to varying charged states of data lines, leading to visible brightness variations even when displaying the same gray scale.
Innovation Solution
The implementation of a liquid crystal display device configuration where green and red pixels are supplied with data signals in the same charged states on corresponding data lines, ensuring consistent brightness across pixels, thereby reducing brightness differences and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If data lines are driven in a two-dot driving manner with alternating positive and negative data signals, then the number of data lines can be reduced, but brightness difference between pixels of the same color increases
Solution Approach 1:
The patent applies local quality by differentiating the connection configuration between green pixels and red pixels. Green pixels are specifically configured to receive data signals from data lines in the same charged state, while red pixels have different connection arrangements. This localized differentiation ensures that green pixels, which are more sensitive to brightness variations, receive consistent charged states, thereby resolving the brightness uniformity issue while maintaining the reduced data line structure.
Solution Approach 2:
The patent implements equipotentiality by ensuring that data lines connected to green pixels maintain the same charged state (both positive or both negative). This creates an equipotential condition for the data signals driving green pixels, eliminating the brightness difference caused by polarity variations. The configuration ensures that adjacent green pixels receive data signals with identical charged states, achieving uniform brightness across the display.
2Device complexity
If adjacent pixels share one data line to reduce the number of data lines, then device complexity is reduced, but brightness difference between pixels displaying the same color becomes visible
Solution Approach 1:
The patent applies local quality by differentiating the connection configuration between green pixels and red pixels. Green pixels are specifically configured to receive data signals from data lines in the same charged state, while red pixels have different connection arrangements. This localized differentiation ensures that green pixels, which are more sensitive to brightness variations, receive consistent charged states, thereby resolving the brightness uniformity issue while maintaining the reduced data line structure.
Solution Approach 2:
The patent implements equipotentiality by ensuring that data lines connected to green pixels maintain the same charged state (both positive or both negative). This creates an equipotential condition for the data signals driving green pixels, eliminating the brightness difference caused by polarity variations. The configuration ensures that adjacent green pixels receive data signals with identical charged states, achieving uniform brightness across the display.
Data Source
AI summary
A liquid crystal display device is disclosed which includes first, second and third data lines arranged in one direction, a data driver for alternately supplying a data signal of a first polarity and a data signal of a second polarity to each of the first, second and third data lines during an interval of two horizontal periods, first and second gate lines arranged to cross the first to third data lines, a gate driver for sequentially driving the first and second gate lines, and first red, first green, first blue, second red, second green and second blue pixels located between the first gate line and the second gate line and arranged in order along the first and second gate lines. The first red pixel cell is connected to one side of the first data line and the second gate line. The first green pixel cell is connected to the other side of the first data line and the first gate line. The first blue pixel cell is connected to one side of the second data line and the first gate line. The second red pixel cell is connected to the other side of the second data line and the second gate line. The second green pixel cell is connected to one side of the third data line and the first gate line. The second blue pixel cell is connected to the other side of the third data line and the second gate line.