LCD Sub-Pixel Electrode Voltage Segmentation for Viewing Angle
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid-crystal display (LCD) devices face challenges in improving visibility without compromising transmittance, particularly in achieving wide viewing angles and maintaining color accuracy, especially when displaying skin tones.
Innovation Solution
The LCD device incorporates a unique pixel structure with multiple electrodes and color filters, where each pixel unit includes a combination of first, second, and third pixels with different voltage applications and overlapping color filters, allowing for varied grayscale levels and improved visibility without reducing transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple sub-pixel electrodes with different voltages are used to improve visibility and viewing angle, then visibility is improved, but device complexity increases
Solution Approach 1:
The pixel electrode is divided into multiple sub-pixel electrodes (first sub-pixel electrode and second sub-pixel electrode) within each pixel. Each sub-pixel electrode can be independently controlled with different voltages to create multiple domains, improving viewing angle and visibility without requiring complete redesign of the display architecture
Solution Approach 2:
Different regions of the same pixel (different sub-pixel electrodes) are assigned different voltage characteristics to optimize local light modulation. The first and second sub-pixel electrodes receive different voltages to create domain structures that improve overall visibility while maintaining local optimization
2Adaptability or versatility
If multiple pixel electrodes per pixel unit are used to achieve wide viewing angle, then viewing angle is improved, but transmittance is reduced
Solution Approach 1:
The liquid crystal molecules are configured to dynamically align along the long axis direction of each sub-pixel electrode when voltage is applied. This dynamic alignment creates multiple domains that expand viewing angle while maintaining efficient light transmission through coordinated voltage control
Solution Approach 2:
The alignment layer is configured to control liquid crystal orientation in a specific dimensional direction (long axis direction of sub-pixel electrodes). By controlling alignment in this specific dimension, the patent achieves wide viewing angle through multi-domain structures while maintaining transmittance through optimized electrode geometry
3Adaptability or versatility
If cut portions or protrusions are formed in field generating electrodes to create multiple domains, then viewing angle is improved, but manufacturing precision requirements increase
Solution Approach 1:
Instead of using physical modifications like cut portions or protrusions, the patent achieves multiple domains by changing the electrical parameter (voltage) applied to different sub-pixel electrodes. This parameter-based approach creates domain structures without requiring complex physical electrode geometries, reducing manufacturing precision requirements
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 enhances visibility, particularly for skin tones, while maintaining or reducing transmittance loss compared to traditional LCDs, by optimizing the liquid crystal alignment and color reproduction across different viewing angles.
Implementation Method 1
liquid-crystal molecules in the liquid-crystal layer are aligned by the electric field so as to control polarization of incident light
Implementation Method 2
liquid-crystal molecules in the liquid-crystal layer are aligned by the electric field so as to control polarization of incident light
Implementation Method 3
a color filter layer overlapping the plurality of pixel units and including first to third color filters
Data Source
AI summary
A liquid-crystal display device includes a first substrate, a plurality of pixel units disposed on the first substrate, a color filter layer overlapping the plurality of pixel units and including first to third color filters, a second substrate facing the first substrate, and a liquid-crystal layer interposed between the first substrate and the second substrate. Each of the pixel units of the plurality of the pixel units includes a first pixel, a second pixel and a third pixel. The first pixel includes a first pixel electrode, the second pixel includes a second pixel electrode, and the third pixel includes a first sub-pixel electrode and a second sub-pixel electrode. A voltage applied to the first sub-pixel electrode is different from a voltage applied to the second sub-pixel electrode.