Liquid Crystal Display Pixel Electrode Slit Angle Optimization
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Solution Overview
Problem
Transverse electric field liquid crystal panels suffer from the reverse twist phenomenon, where external pressure causes disturbance in the alignment of liquid crystal molecules, leading to residual display irregularities that persist even after pressure is removed, due to disclination and reverse twist lines forming along electrode branches.
Innovation Solution
The liquid crystal panel design includes a pixel electrode pattern and alignment film where the extension direction of slits between electrode branches crosses the alignment direction of the liquid crystal layer at an angle of 7° or larger, improving alignment stability and reducing reverse twist lines by allowing the disturbance to self-correct.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the extension direction of slits between electrode branches is parallel to the alignment direction of the liquid crystal layer, then the manufacturing process is simple, but reverse twist lines occur and alignment stability deteriorates
Solution Approach 1:
The patent applies asymmetry by intentionally setting the extension direction of slits between electrode branches to cross the alignment direction of the liquid crystal layer at an angle of 7° or more. This asymmetric configuration prevents the formation of reverse twist lines and improves alignment stability, resolving the contradiction between simple manufacturing and reliable performance.
2Reliability
If the extension direction of slits between electrode branches crosses the alignment direction at a larger angle, then alignment stability improves and reverse twist lines reduce, but transmittance may be affected
Solution Approach 1:
The patent applies parameter changes by optimizing the crossing angle between the extension direction of slits and the alignment direction of the liquid crystal layer. By setting this angle to 7° or more, the patent achieves improved alignment stability while maintaining acceptable transmittance characteristics, thus resolving the contradiction between reliability and illumination intensity.
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
This design effectively reduces the occurrence and persistence of reverse twist lines, improving display quality and maintaining high transmittance, with the disturbance self-correcting within 3.5 seconds at a 7° angle and disappearing faster as the angle increases, while maintaining optimal transmittance.
Implementation Method 1
an alignment film 11 is disposed on the inner surface of each substrate. Note that the alignment film 11 is used to arrange a group of liquid crystal molecules of the liquid crystal layer 7 in a predetermined direction.
Implementation Method 2
a transverse electric field driving liquid crystal panel which performs rotation control of the arrangement of liquid crystal molecules in parallel to a substrate surface by a transverse electric field generated between a pixel electrode and a counter electrode
Implementation Method 3
a liquid crystal layer 7 filled so as to be sandwiched with the glass substrates 3 and 5
Data Source
AI summary
A liquid crystal display device is provided and includes a substrate; a liquid crystal layer; pixels each having a pixel electrode between the liquid crystal layer and the substrate, and a thin film transistor connected to the pixel electrode; a counter electrode over the pixels; scanning lines each having a longitudinal direction along a first direction; signal lines each having a longitudinal direction along a second direction; and a first protrusion having a convex shape, the first protrusion being a part of the pixel electrode, protruding in one of the first direction and the second direction, and not overlapping the thin film transistor.