Liquid Crystal Display Storage Electrode Design for Lateral Visibility
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Solution Overview
Problem
Liquid crystal display (LCD) systems, particularly in vertically aligned modes, face challenges with poor lateral visibility and image distortion due to uneven light transmittance across sub-pixels, leading to reduced aperture ratio and inadequate control over color voltages.
Innovation Solution
The implementation of a liquid crystal display design featuring first and second sub-pixels with distinct capacitances and voltage applications, where the storage capacitance is adjusted to equalize kickback voltages and maintain image quality, while maintaining the aperture ratio through strategic electrode configurations and overlapping areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a pixel is divided into two sub-pixels with capacitor combination to enhance lateral visibility, then lateral visibility is improved, but the aperture ratio is deteriorated due to addition of capacitor conductor
Solution Approach 1:
The invention combines the storage capacitor electrode with the common electrode structure, making the common electrode serve dual functions as both common electrode and storage capacitor electrode, thereby eliminating the need for separate capacitor conductors and preserving aperture ratio
Solution Approach 2:
The common electrode is designed to perform multiple functions simultaneously: serving as the common electrode for voltage application and as the storage capacitor electrode for maintaining voltage in sub-pixels, thus achieving multi-functionality without increasing device complexity
2Illumination intensity
If capacitor combination is used to differentiate voltage between sub-pixels, then lateral visibility is improved, but light transmittance is reduced due to capacitor combination-induced voltage drop
Solution Approach 1:
By merging the storage capacitor electrode with the common electrode, the invention eliminates the voltage drop issue associated with separate capacitor structures, maintaining proper voltage levels and light transmittance while still achieving lateral visibility improvement
3Manufacturing precision
If storage capacitance is adjusted to equalize kickback voltages, then image quality is maintained, but electrode configuration complexity increases
Solution Approach 1:
The invention simplifies electrode configuration by combining storage capacitor and common electrode functions, reducing the number of electrodes while maintaining the ability to control storage capacitance for kickback voltage equalization and image quality
Solution Approach 2:
The invention allows different regions of the common electrode to have different overlapping areas with sub-pixel electrodes, enabling local adjustment of storage capacitance values to equalize kickback voltages across different sub-pixels while using a single unified electrode structure
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 approach enhances lateral visibility by ensuring uniform light transmittance across sub-pixels, reduces image distortion, and maintains the aperture ratio, thereby improving overall display performance.
Implementation Method 1
The LCD generates an electric field in the LC layer by applying voltages to the field-generating electrodes, and aligns the LC molecules of the LC layer to control the polarization of light incident thereto
Implementation Method 2
The LCD generates an electric field in the LC layer by applying voltages to the field-generating electrodes
Implementation Method 3
the storage electrode having a body and an extension, an expansion overlapping the body of the storage electrode, and a connection connecting the end portion and the expansion
Data Source
AI summary
A liquid crystal display includes a first gate electrode, a storage electrode having a body and an extension, a first semiconductor formed on a gate insulating layer, a first drain electrode formed on the first semiconductor, separated from a first source electrode, and having an end portion overlapping the first gate electrode, and an expansion overlapping the body of the storage electrode and distanced from the end portion with a connection connecting the end portion and the expansion and overlapping the extension of the storage electrode, a passivation layer having a contact hole exposing the expansion of the first drain electrode, and a first field-generating electrode connected to the first drain electrode through the contact hole.