LCD Pixel Electrode Segmentation for Side-View Visibility
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Solution Overview
Problem
Liquid crystal display (LCD) devices of the vertically aligned (VA) type suffer from inferior side-view visibility compared to front-view visibility, limiting their performance in displaying images effectively.
Innovation Solution
The implementation of a liquid crystal display (LCD) pixel design that includes multiple regions with different vertical electric fields generated by varying voltage configurations across the first and second electrodes, slit electrodes, and an upper-plate common electrode, allowing for precise control of liquid crystal molecule alignment and improving side-view visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a vertically aligned (VA) type LCD device is used to achieve high contrast ratio and wide viewing angle, then the contrast ratio and viewing angle are improved, but the side-view visibility becomes inferior to front-view visibility
Solution Approach 1:
The pixel electrode is divided into multiple regions (first region, second region, third region, fourth region) with different electrode configurations. Each region generates different vertical electric fields to control liquid crystal molecule alignment differently, thereby improving side-view visibility while maintaining high contrast ratio.
Solution Approach 2:
Different regions of the pixel electrode are assigned different functions: some regions use slit electrodes to generate strong vertical electric fields for high contrast, while other regions use double-electrode structures to create specific alignment patterns that improve side-view visibility. This local differentiation resolves the contradiction between contrast ratio and side-view visibility.
2Ease of operation
If multiple regions with different vertical electric fields are created to improve side-view visibility, then side-view visibility is enhanced, but the device complexity increases due to additional electrodes and voltage configurations
Solution Approach 1:
The first electrode and second electrode are combined to form a double-electrode structure in certain regions. This merging reduces the total number of separate electrode components while still achieving the desired different vertical electric fields across regions, thereby improving side-view visibility without proportionally increasing device complexity.
Solution Approach 2:
The upper-plate common electrode serves multiple functions: it acts as a common reference electrode for all regions and simultaneously participates in generating the specific vertical electric fields required in each region when combined with the different lower electrode configurations. This multi-functionality reduces the need for additional dedicated electrodes.
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 design enhances side-view visibility by creating distinct vertical electric fields across different regions of the LCD pixel, allowing for improved liquid crystal molecule alignment and configuration, thereby enhancing the overall display quality of the LCD device.
Implementation Method 1
The LCD device applies voltages to the pixel electrodes and the common electrodes, and generates an electric field across the liquid crystal layer
Implementation Method 2
The LCD device controls a polarized light that is emitted from a backlight unit by determining a direction of alignment for liquid crystal molecules included in the liquid crystal layer based on the electric field
Data Source
AI summary
A liquid crystal display (LCD) pixel includes a first substrate, a first electrode and a second electrode disposed on the first substrate, an insulation layer configured to overlap at least a portion of the first electrode and the second electrode, a first slit electrode and a second slit electrodes disposed on the insulation layer, a second substrate disposed across from the first substrate, an upper-plate common electrode disposed on the second substrate, and a liquid crystal layer interposed between the slit electrodes and the upper-plate common electrode. The LCD pixel driven by a plurality of regions in which different vertical electric fields are generated based on arrangements of at least one of the first electrode, the second electrode, the first slit electrode, the second slit electrode, and the upper-plate common electrode.