Liquid Crystal Panel Electrode Pattern for Alignment Stability
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Solution Overview
Problem
Transverse electric field liquid crystal panels experience alignment disturbances due to the reverse twist phenomenon, leading to display irregularities and residual images, which are not self-correcting and affect viewing angles and transmittance.
Innovation Solution
The liquid crystal panel design incorporates a pixel electrode pattern with slits that cross the alignment direction of the liquid crystal layer at an angle of 7° or larger, reducing alignment disturbances and allowing them to self-correct, while maintaining optimal transmittance and viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel electrode pattern with comb-shaped electrode branches is used, then a parabolic electric field is generated between the electrode branches and counter electrode, but alignment disturbances occur at both ends of the slit causing reverse twist phenomenon and display irregularities
Solution Approach 1:
The patent applies local quality by changing the electrode pattern configuration specifically at the slit end portions where alignment disturbances occur. The electrode branches are extended beyond the conventional pattern at these critical locations, creating a localized structural modification that suppresses disclination and reverse twist phenomenon without affecting the overall parabolic electric field distribution generated by the main electrode structure.
2Adaptability or versatility
If the extension direction of the slit is made perpendicular to the alignment direction of the liquid crystal layer, then the viewing angle is widened, but alignment disturbances are exacerbated at the slit ends
Solution Approach 1:
The patent maintains the perpendicular relationship between the slit extension direction and liquid crystal alignment direction in the majority of the pixel region to preserve wide viewing angle characteristics. However, at the slit end portions, the electrode branches are extended beyond the conventional pattern to create a localized modification that suppresses disclination and alignment disturbances, thus resolving the contradiction between viewing angle and alignment stability.
3Reliability
If the pixel electrode pattern is modified to extend electrode branches beyond conventional patterns, then alignment disturbances are suppressed, but the manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by modifying the electrode pattern only at the slit end portions where alignment disturbances occur, while maintaining the conventional comb-shaped electrode branch pattern in the majority of the pixel region. This localized modification approach suppresses disclination and reverse twist phenomenon without requiring a complete redesign of the entire electrode structure, thus limiting the increase in manufacturing complexity to only the critical affected areas.
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 enhances alignment stability, reduces display irregularities, and improves transmittance by allowing reverse twist lines to disappear rapidly, maintaining high display quality and wide viewing angles.
Implementation Method 1
a liquid crystal layer 7 filled so as to be sandwiched with the glass substrates 3 and 5
Implementation Method 2
the rotation direction of liquid crystal molecules is parallel to the substrate surface
Implementation Method 3
an electric field is generated in the horizontal direction with respect to the panel surface
Implementation Method 4
This electrode structure causes a parabolic electric field between the electrode branches 13A and the counter electrode 15
Implementation Method 5
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
Data Source
AI summary
A liquid crystal panel is provided and includes first and second substrates with liquid crystal layer therebetween; and first electrode in display region; second electrode disposed between first electrode and first substrate; and alignment film having alignment direction, wherein first electrode has: pair of electrode branches; slit between pair of electrode branches; first and second connections connecting pair of electrode branches; wherein first electrode has areas including first and second bent portions, main portion disposed between first and second bent portions, wherein first bent portion is adjacent to contact hole of first electrode, wherein first and second bent portions are bent relative to main portion, and wherein direction of first bent portion is substantially parallel to direction of second bent portion.