Liquid Crystal Display Sub-Pixel Stripe Pattern Modulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal displays using Kerr effect liquid crystals exhibit unstable display quality due to significant changes in transmittance when the driving voltage shifts, affecting the display of gray levels.
Innovation Solution
A liquid crystal display unit with a quasi-isotropic liquid crystal layer and a pixel unit comprising sub-pixel units with alternating first and second transmissive regions, where the width and gap of stripe patterns on the pixel and common electrodes are adjusted to modulate the voltage-transmittance curves, ensuring stable display quality by optimizing the effective voltage-transmittance curve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If Kerr effect liquid crystal is used to achieve fast response and high transmittance, then response speed and brightness are improved, but display quality becomes unstable due to significant transmittance changes when driving voltage shifts
Solution Approach 1:
The pixel electrode is divided into multiple stripe patterns with different width-to-gap ratios (L1/S1, L2/S2, L3/S3), creating multiple sub-regions within each sub-pixel unit. Each stripe pattern generates a different electric field distribution, producing distinct voltage-transmittance curves that when combined create a composite curve with improved stability against voltage shifts while maintaining fast response characteristics of Kerr effect liquid crystal.
Solution Approach 2:
Different regions of the pixel electrode are designed with locally optimized stripe pattern dimensions. The first, second, and third stripe patterns have different width and gap measurements, creating localized electric field variations. This local differentiation allows each region to contribute differently to the overall transmittance response, achieving a balanced composite voltage-transmittance curve that is less sensitive to voltage fluctuations.
2Ease of manufacture
If single stripe pattern width and gap are used to simplify manufacturing, then manufacturing complexity is reduced, but voltage-transmittance curve stability deteriorates
Solution Approach 1:
The invention changes the geometric parameters (width and gap) of the stripe patterns to create different electric field distributions. By adjusting the width-to-gap ratios of different stripe patterns, the voltage-transmittance characteristics are modified. This parameter variation approach allows control over the composite voltage-transmittance curve shape without requiring complex liquid crystal materials or additional device layers, maintaining manufacturing simplicity while achieving curve stability.
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 solution stabilizes the display quality by minimizing transmittance changes when the driving voltage shifts, maintaining stable gray level representation even at maximum driving voltage, with voltage differences within acceptable limits.
Implementation Method 1
a birefringence (Δn) of the quasi-isotropic liquid crystal layer is proportional to an electric field (E) between the pixel electrode and the common electrode
Implementation Method 2
Kerr effect liquid crystal (e.g. blue phase liquid crystal) and the VA liquid crystal have different optical properties and electrical characteristics
Data Source
AI summary
A liquid crystal display unit including a pixel unit and a quasi-isotropic liquid crystal layer with Kerr effect is provided. The pixel unit includes sub-pixel units, each sub-pixel unit at least has a first transmissive region and a second transmissive region. Each sub-pixel unit includes a switch, a pixel electrode, and a common electrode. Each pixel electrode has first stripe patterns. The common electrode has second stripe patterns, wherein the first stripe patterns and the second stripe patterns are arranged alternately. In the first transmissive region, width of each first stripe pattern is L1, while a gap between each first stripe pattern and the corresponding second stripe pattern adjacent thereto is S1. In the second transmissive regions, width of each first stripe pattern is L2, while a gap between each first stripe pattern and the corresponding second stripe pattern adjacent thereto is S2, wherein L1≠L2 or S1≠S2 or L1/S1≠L2/S2.