TFT-LCD Sub-pixel Structure for Uniform Liquid Crystal Tilting
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Solution Overview
Problem
Existing two-domain sub-pixel structures in ADS mode TFT-LCDs suffer from color deviation and unsatisfactory image quality due to non-uniform liquid crystal tilting, leading to dark regions in the display area.
Innovation Solution
A sub-pixel structure with a gate line positioned at the interface between two domains, creating liquid crystal electric fields with angles between 0° and 180°, and modifying the thin film transistor structure to ensure self-compensation of gate-source parasitic capacitance, thereby reducing dark regions and enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a double-domain sub-pixel structure with two kinds of strip-like common electrodes is used, then color deviation is improved, but dark regions are generated in the display area due to non-uniform liquid crystal tilting at the interface
Solution Approach 1:
The patent applies local quality by positioning the gate line specifically at the interface between the two domains where common electrodes have different orientations. This localized placement ensures that the black matrix covers only the critical interface region, compensating for the dark region problem at that specific location without affecting other areas of the display.
Solution Approach 2:
The patent converts the harmful effect of the gate line (which creates a dark region when covered by black matrix) into a beneficial effect by strategically positioning it at the domain interface. The dark region created by the black matrix at the interface compensates for the non-uniform liquid crystal tilting dark regions, thereby improving overall display uniformity.
2Illumination intensity
If the gate line is positioned at the interface between two domains, then dark region area is reduced, but the structure complexity increases
Solution Approach 1:
The patent creates a symmetric structure where the gate line is positioned at the interface between two domains with equal angular relationships. The liquid crystal electric fields in both domains form equal angles with the gate line, creating a balanced configuration that simplifies the overall design while maintaining performance.
3Manufacturing precision
If liquid crystal electric fields with angles between 0° and 180° are created in two domains, then image quality is improved, but transmittance may be reduced due to additional interface structures
Solution Approach 1:
The patent optimizes the angular parameter of the liquid crystal electric fields, specifying that the angle between the electric field direction and the gate line should be between 0° and 180°. This parameter optimization ensures uniform liquid crystal tilting while minimizing the impact on light transmittance.
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 solution effectively reduces the area of dark regions, improves transmittance, and stabilizes image quality by ensuring consistent leaping voltage and minimizing image flicker or sticking.
Implementation Method 1
a liquid crystal electric field in a first domain and a liquid crystal electric field in a second domain, which are located on both sides of the gate line, respectively, are created between the sub-pixel electrode and the common electrode
Implementation Method 2
All the liquid crystal molecules with different orientations in a liquid crystal cell, which are located directly above the electrode and between the strip-like electrodes, to be rotated
Data Source
AI summary
According to embodiments of the present invention, there are provided a sub-pixel structure of a thin film transistor liquid crystal display and a liquid crystal display. The sub-pixel structure comprises: a gate line, a data line, a thin film transistor, a sub-pixel electrode, and a common electrode, which are formed on an array substrate, wherein a liquid crystal electric field in a first domain and a liquid crystal electric field in a second domain, which are located on both sides of the gate line, respectively, are created between the sub-pixel electrode and the common electrode, and the angle between the direction of the liquid crystal electric field in the first domain and the direction of the liquid crystal electric field in the second domain is larger than 0° and smaller than 180°.