Auxiliary Electrode Display Panel for Viewing Angle and Aperture Ratio
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Solution Overview
Problem
Conventional eight-domain liquid crystal display pixel structures suffer from a wide dark area and low aperture ratio, leading to reduced performance and color shift at large viewing angles due to their complex design and increased functional blocks.
Innovation Solution
A display panel with a four-domain pixel structure incorporating an auxiliary electrode around the pixel electrode, connected to a second thin film transistor, which creates a potential difference to drive liquid crystal deflection, reducing the dark area and improving aperture ratio and viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an eight-domain display pixel structure is used to improve viewing angles, then viewing angle performance is improved to some extent, but the pixel structure becomes complicated requiring more functional blocks, resulting in a wide dark area and large aperture ratio loss
Solution Approach 1:
The pixel is divided into four display domains with different liquid crystal molecule rotation angles, allowing independent control of each domain's optical properties while maintaining a simpler structure compared to eight-domain designs
Solution Approach 2:
An auxiliary electrode is introduced as an intermediary component between the pixel electrode and the liquid crystal layer. This auxiliary electrode applies additional electric field to control liquid crystal molecule orientation in specific regions, enabling improved viewing angle performance without increasing structural complexity
2Illumination intensity
If an eight-domain display pixel structure is used to improve viewing angles, then viewing angle performance is improved to some extent, but more functional blocks are required resulting in a wide dark area and low penetration rate
Solution Approach 1:
The pixel is divided into four display domains with different liquid crystal molecule rotation angles, allowing independent control of each domain's optical properties while maintaining a simpler structure compared to eight-domain designs
Solution Approach 2:
An auxiliary electrode is introduced as an intermediary component between the pixel electrode and the liquid crystal layer. This auxiliary electrode applies additional electric field to control liquid crystal molecule orientation in specific regions, enabling improved viewing angle performance without increasing structural complexity
3Device complexity
If a traditional four-domain pixel design is used, then the pixel structure remains simple, but color of large viewing angles becomes lighter due to limited viewing angle performance
Solution Approach 1:
An auxiliary electrode is introduced as an intermediary component between the pixel electrode and the liquid crystal layer. This auxiliary electrode applies additional electric field to control liquid crystal molecule orientation in specific regions, enabling improved viewing angle performance without increasing structural complexity
Solution Approach 2:
Different regions of the pixel are given different properties by applying different rotation angles to liquid crystal molecules in different display domains, while the auxiliary electrode provides localized control to optimize color stability in specific areas at large viewing angles
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 enhances color stability at large viewing angles and increases the pixel aperture ratio by deflecting liquid crystals and reducing the dark area around the pixel, effectively improving display performance.
Implementation Method 1
Potential received by the pixel electrode and potential received by the auxiliary electrode have a difference, thereby driving liquid crystal around a pixel to deflect
Data Source
AI summary
A display panel includes an array substrate, a color filter substrate, and a liquid crystal layer. The array substrate includes a scan line and a data line; a pixel electrode disposed corresponding to a pixel area; a first thin film transistor configured to electrically connect the pixel electrode to the scan line and the data line; an auxiliary electrode disposed on a same layer as the pixel electrode and arranged around the pixel electrode; and a second thin film transistor configured to electrically connect the auxiliary electrode to the first thin film transistor. Potential received by the pixel electrode and potential received by the auxiliary electrode have a difference.