Fishbone Electrode LCD Cell Gap Optimization
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Solution Overview
Problem
Liquid crystal display devices with narrower cell gaps struggle to achieve sufficient contrast improvement, especially when using an electrode with a fishbone pattern, as adjusting the refractive-index anisotropy of the liquid crystal composition alone is insufficient.
Innovation Solution
A liquid crystal display device with a fishbone pattern electrode and a specific relationship between the inter-substrate distance and the space between adjacent branches of the pattern, optimizing the alignment of liquid crystal molecules for improved contrast and response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the cell gap is narrowed to improve response speed, then response speed is improved, but contrast deteriorates
Solution Approach 1:
The patent applies parameter changes by establishing a specific mathematical relationship between the cell gap (d) and the electrode pattern spacing (S) through Formula (1). This formula dynamically adjusts the electrode spacing parameter based on the cell gap parameter, ensuring optimal liquid crystal alignment and contrast performance across different cell gap widths. The relationship (d-0.6)/1.25 ≤ S ≤ (d+1.1)/1.25 provides a systematic way to modify electrode geometry parameters to compensate for the contrast deterioration caused by narrowed cell gaps.
2Manufacturing precision
If the refractive-index anisotropy (Δn) of liquid crystal composition is increased to improve contrast, then contrast is improved, but the effectiveness diminishes when cell gap is 3.6 μm or less with fishbone pattern electrode
Solution Approach 1:
The patent applies local quality by optimizing the electrode pattern geometry locally to match the specific cell gap dimension. Instead of relying solely on bulk liquid crystal properties (Δn), the invention modifies the local electrode structure (spacing S between branches) to create optimal electric field distribution in the liquid crystal layer. This local geometric optimization ensures that the electrode structure adapts to narrow cell gaps where traditional Δn adjustment becomes ineffective, providing enhanced contrast through localized field control rather than bulk material properties.
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 device exhibits enhanced contrast and response speed by optimizing the alignment of liquid crystal molecules, effectively addressing the limitations of narrower cell gaps and fishbone pattern electrodes.
Implementation Method 1
a liquid crystal layer that is disposed between the first substrate and the second substrate and is vertically aligned with respect to the first and second substrates when no voltage is applied between the electrodes
Implementation Method 2
the electrode A has a fishbone pattern having a branched portion, and a space (S μm) between adjacent branches of branches of the fishbone pattern and an inter-substrate distance (d μm) between the first substrate and the second substrate satisfy a relationship of formula (1)
Data Source
AI summary
The present invention provides a liquid crystal display device that includes a first substrate having an electrode A formed thereon; a second substrate having an electrode B formed thereon and being disposed to oppose the first substrate; and a liquid crystal layer disposed between the first substrate and the second substrate and substantially vertically aligned with respect to the first and second substrates when no voltage is applied between electrodes, in which the electrode A has a fishbone pattern having a branched portion, and a space (S μm) between adjacent branches of branches of the fishbone pattern and an inter-substrate distance (d μm) between the first substrate and the second substrate satisfy a relationship of formula (1):(d−0.6)/1.25<S<(d+1.1)/1.25 formula (1).