Vertical Alignment LCD Pixel Structure with Dual Electrodes
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Solution Overview
Problem
Conventional liquid crystal display (LCD) technologies, such as TFT-LCD, suffer from narrow view angles and significant color shift when viewed from different angles, limiting their application in high-end fields like aviation and medicine, where wide view angles and improved color consistency are required.
Innovation Solution
A pixel structure comprising two non-connected pixel electrodes arranged in a 'cross' and 'saltire' configuration, with each electrode connected to separate data lines through thin-film transistors, allowing for different voltage applications to achieve multiple polar angles and reduce phase differences in liquid crystal molecules, thereby enhancing view angles and color stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional pixel structure with a single pixel electrode is used, then the device structure is simple, but the view angle is narrow and color shift occurs when viewed from different angles
Solution Approach 1:
The pixel electrode is divided into four separate pixel electrodes (first, second, third, and fourth pixel electrodes), each connected to a separate data line. This segmentation allows different voltage applications to achieve multiple polar angles, resolving the narrow view angle problem while maintaining manageable structural complexity through systematic arrangement.
Solution Approach 2:
The patent introduces a new dimensional arrangement by configuring the four pixel electrodes in a specific spatial pattern with trunk electrodes and branch electrodes at ±45° angles. This multi-dimensional electrode arrangement creates multiple polar angles simultaneously, expanding the effective viewing angle beyond what a single electrode could achieve.
2Adaptability or versatility
If multiple pixel electrodes are used to improve view angle, then the view angle and color stability improve, but the device complexity increases
Solution Approach 1:
The pixel electrodes are arranged asymmetrically with trunk electrodes intersecting at right angles and branch electrodes extending at ±45° angles. This asymmetric configuration creates different polar angles in different directions, achieving color stability across multiple viewing angles while the systematic pattern keeps manufacturing complexity manageable.
Solution Approach 2:
The patent uses four pixel electrodes instead of the conventional single electrode, applying partial actions to different regions of the pixel. Each electrode can be independently controlled to create specific polarization states, achieving superior color stability through distributed control rather than uniform action.
3Adaptability or versatility
If a single pixel electrode is used, then the manufacturing process is simple, but liquid crystal molecules exhibit the same polarization angle causing poor view angle characteristics
Solution Approach 1:
The single pixel electrode is segmented into four independent pixel electrodes, each connected to separate data lines. This allows independent voltage control and creates multiple polar angles in the liquid crystal molecules, improving view angle characteristics while the modular structure facilitates systematic manufacturing.
Solution Approach 2:
Different regions of the pixel are assigned different electrode configurations with specific orientations (trunk electrodes at right angles, branch electrodes at ±45°). This local differentiation creates varied polarization effects across the pixel, achieving broad view angle coverage while maintaining consistent manufacturing processes for each electrode type.
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
The proposed pixel structure improves view angles and color shift by allowing liquid crystal molecules to exhibit multiple polar angles, reducing phase differences and enhancing display performance across various viewing angles.
Implementation Method 1
allowing for different voltage applications to achieve multiple polar angles and reduce phase differences in liquid crystal molecules
Implementation Method 2
due to the birefringence effect of the liquid crystal molecules, the same liquid crystal molecule exhibits different refractive indices as being observed from different view angles
Data Source
AI summary
The present invention provides a pixel structure and a manufacturing method thereof. The pixel structure according to the present invention is such that two pixel electrodes that are not connected to each other are arranged in a single pixel structure and the two pixel electrodes are respectively connected to two data lines through respective thin-film transistors. In normal displaying, the two data lines are respectively applied with different voltages so that the two pixel electrodes are respectively set at different potentials. The different potentials of the two pixel electrodes cause liquid crystal molecules that are close to different ones of the pixel electrodes to show different polar angles so as to achieve distribution and existence of multiple polar angles in the liquid crystal, reducing the amount of phase difference of liquid crystal in different directions and thus improving the view angle and color shift of a vertical alignment liquid crystal display. The manufacturing method of the pixel structure according to the present invention is such that a manufacturing operation can be conducted easily and a pixel structure so manufactured allows for, in normal displaying, achievement of distribution and existence of multiple polar angles in liquid crystal, reducing the amount of phase difference of liquid crystal in different directions and thus improving the view angle and color shift of a vertical alignment liquid crystal display.