LCD Branch Electrode Oblique End for Viewing Angle
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Solution Overview
Problem
Liquid crystal displays (LCDs) face display quality deterioration due to irregular arrangements of liquid crystal molecules caused by fringe fields at the end portions of branch electrodes, leading to reduced transmittance and viewing angles.
Innovation Solution
The design includes a first and second electrode on a substrate with branch electrodes, where the end portion of the branch electrodes features a first side portion, a second side portion, and an oblique portion forming a first angle less than 90 degrees, with a light blocking member surrounding the electrodes to optimize liquid crystal alignment and prevent irregular movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If branch electrodes are used in liquid crystal display, then transmittance is increased and viewing angle is widened, but irregular arrangement of liquid crystal molecules occurs at end portions causing display deterioration
Solution Approach 1:
The patent applies different geometric configurations to different portions of the branch electrodes. Specifically, the end portions are designed with oblique portions forming acute angles (less than 90 degrees) with the extending lines of side portions, while other portions maintain standard configurations. This local differentiation addresses the display deterioration problem at end portions without compromising the overall transmittance enhancement provided by the branch electrode structure.
2Ease of manufacture
If branch electrodes with perpendicular connections are used, then manufacturing is simplified, but liquid crystal molecules exhibit irregular movements at end portions
Solution Approach 1:
The patent introduces asymmetric oblique portions at the end portions of branch electrodes, where the oblique portions form acute angles with the extending lines of side portions. This asymmetric design replaces the conventional perpendicular connection configuration, creating a more favorable electric field distribution that prevents irregular liquid crystal molecule arrangements while maintaining manufacturing feasibility through standardized fabrication processes.
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 configuration effectively prevents display quality deterioration, increases transmittance, and achieves a wider viewing angle by aligning liquid crystal molecules optimally.
Implementation Method 1
by an influence of a fringe field generated in different directions on an end portion of the branch electrode, an irregular arrangement of liquid crystal molecules may occur
Implementation Method 2
the liquid crystal molecules have positive dielectric anisotropy or negative dielectric anisotropy
Data Source
AI summary
A liquid crystal display includes: a first substrate; a gate line and a data line disposed on the first substrate; a passivation layer disposed on the gate line and the data line; a first electrode and a second electrode disposed on the passivation layer; and a first insulating layer interposed between the first and second electrodes, where the first and second electrodes overlap each other via the first insulating layer, the second electrode includes a plurality of branch electrodes, and an end portion of the plurality of branch electrodes includes a first side portion and a second side portion extending parallel to the data line, and an oblique portion which connects the first side portion and the second side portion to each other and forms a first angle of less than 90 degrees with an extending line of the first side portion.