Slit Electrode Segmentation for ADS LCD Transmittance
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Solution Overview
Problem
Advanced Super Dimension (ADS) liquid crystal displays face issues with reduced transmittance and contrast due to superimposed electric fields causing disorder in liquid crystal deflection, leading to 'display dead regions' and insufficient gray levels, especially under high-brightness ambient light.
Innovation Solution
The array substrate design includes a slit electrode with strip-shaped portions extending in different directions, an insulation protrusion, and a reflection electrode, forming electric fields in multiple directions to prevent mono-domain liquid crystal alignment, while the insulation protrusion and reflection electrode enhance drive depth and reduce drive voltage, allowing for effective multi-domain display and improved transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional slit electrode is used in ADS liquid crystal display, then the display can achieve wide view angle and high resolution, but superimposed electric fields cause disorder in liquid crystal deflection leading to reduced transmittance and contrast
Solution Approach 1:
The electrode is segmented into multiple strip-shaped portions extending in different directions, with insulation protrusions separating them. This segmentation prevents superimposed electric fields from causing disorder, eliminating display dead regions while maintaining wide view angle and high resolution characteristics.
Solution Approach 2:
Different regions of the electrode are designed with different orientations (first strip-shaped portions in one direction, second strip-shaped portions in another direction). This local quality variation ensures uniform liquid crystal deflection across different areas, improving both transmittance and display quality simultaneously.
2Ease of manufacture
If the electrode structure is simplified, then manufacturing is easier, but display dead regions occur due to mono-domain liquid crystal alignment
Solution Approach 1:
The electrode is divided into multiple strip-shaped portions with different orientations, separated by insulation protrusions. This segmentation prevents mono-domain alignment and display dead regions while maintaining a relatively simple manufacturing process suitable for mass production.
3Speed
If higher drive voltage is used, then liquid crystal deflection is stronger, but energy consumption increases and transmittance decreases
Solution Approach 1:
The electrode provides locally optimized electric field distribution through differently oriented strip-shaped portions. This ensures strong liquid crystal deflection throughout the entire display area at lower drive voltages, improving response speed while reducing power consumption and maintaining high 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
This configuration increases the transmittance and aperture ratio of the liquid crystal display panel, enabling better gray level representation and contrast, even under high ambient light conditions, by effectively utilizing ambient light and reducing the drive voltage.
Implementation Method 1
an electric field is fit to form between the second electrode and the first electrode
Implementation Method 2
liquid crystal molecules in the full thickness of the liquid crystal layer are induced to enable birefringence
Implementation Method 3
an electric field is fit to form between the reflection electrode and the second electrode
Implementation Method 4
a dielectric constant of the insulation protrusion is between 20 and 30
Data Source
AI summary
An array substrate and a liquid crystal display panel thereof. The array substrate includes a substrate having a plurality of pixel regions arranged in an array. Each of the pixel regions (120a) includes: a first electrode, a second electrode, an insulation protrusion, and a reflection electrode. An electric field is fit to form between the second electrode and the first electrode, and an electric field is also fit to form between the reflection electrode and the second electrode. The second electrode includes a slit electrode, which includes a plurality of slit portions and a plurality of electrode portions each arranged between adjacent slit portions. The electrode portion at least includes a first strip-shaped portion and a second strip-shaped portion. An extension direction of the first strip-shaped portion intersects with that of the second strip-shaped portion, and the first strip and second strip-shaped portions of each electrode portion are connected at a corresponding bending portion. For orthographic projections in a plane where the substrate is located, bending portions of the second electrode and the reflection electrode are located within the insulation protrusion.