LCD Pixel Electrode Gate Line Overlap Prevents Light Leakage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal displays (LCDs) face issues with light leakage between pixels due to electric fields, which affect transmittance and aperture ratio, particularly in vertically aligned modes where wide viewing angles and high contrast ratios are desired.
Innovation Solution
The design incorporates a pixel electrode with sub-regions and a gate line that overlaps the boundary between these sub-regions, along with a storage electrode line and a TFT configuration, to control liquid crystal molecule alignment and block electric fields, preventing light leakage and enhancing transmittance and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gate line is positioned between adjacent pixels to control electric fields, then light leakage between pixels is prevented, but the aperture ratio and transmittance are reduced
Solution Approach 1:
The gate line is repositioned from a horizontal arrangement between pixels to a vertical arrangement that overlaps the stem portion of the pixel electrode. This dimensional change allows the gate line to extend in the vertical direction through the pixel electrode boundary, enabling electric field control without occupying horizontal space between pixels, thus maintaining aperture ratio while preventing light leakage.
Solution Approach 2:
The pixel electrode is divided into multiple sub-regions with different liquid crystal alignment characteristics. The gate line is positioned to overlap the boundary between these sub-regions, allowing localized electric field control to prevent light leakage while preserving the overall aperture ratio of the pixel structure.
2Reliability
If a gate line extends between adjacent pixels to block electric fields, then light leakage is prevented, but the aperture ratio is reduced
Solution Approach 1:
The gate line is repositioned from a horizontal arrangement between pixels to a vertical arrangement that overlaps the stem portion of the pixel electrode. This dimensional change allows the gate line to extend in the vertical direction through the pixel electrode boundary, enabling electric field control without occupying horizontal space between pixels, thus maintaining aperture ratio while preventing light leakage.
Solution Approach 2:
The stem portion of the pixel electrode serves as an intermediary structure that the gate line overlaps. This intermediary allows the gate line to extend vertically through the pixel electrode boundary, providing electric field control and light leakage prevention while maintaining the aperture ratio through the stem's conductive path.
3Adaptability or versatility
If the pixel electrode structure is modified to include sub-regions for wide viewing angle, then viewing angle is improved, but the aperture ratio may be reduced
Solution Approach 1:
The pixel electrode is divided into multiple sub-regions with different liquid crystal alignment characteristics. The gate line is positioned to overlap the boundary between these sub-regions, allowing localized electric field control to prevent light leakage while preserving the overall aperture ratio of the pixel structure.
Solution Approach 2:
The gate line is repositioned from a horizontal arrangement between pixels to a vertical arrangement that overlaps the stem portion of the pixel electrode. This dimensional change allows the gate line to extend in the vertical direction through the pixel electrode boundary, enabling electric field control without occupying horizontal space between pixels, thus maintaining aperture ratio while preventing light leakage.
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 effectively prevents light leakage between pixels, improves transmittance, and increases the aperture ratio, allowing for better display performance with wide viewing angles and high contrast ratios.
Implementation Method 1
a gate line disposed on the lower substrate and including a portion that extends overlapping a boundary between adjacent sub-regions of the pixel electrode
Implementation Method 2
The electric field determines alignments of liquid crystal molecules of the liquid crystal layer through the electric field, thereby controlling polarization of incident light
Implementation Method 3
controlling polarization of incident light
Implementation Method 4
the liquid crystals are re-arranged by fringe fields formed between an edge of the cutout and the field generating electrode facing the edge of the cutout
Data Source
AI summary
A liquid crystal display includes a plurality of pixels, a lower substrate and an upper substrate facing each other, a liquid crystal layer disposed between the lower substrate and the upper substrate, a pixel electrode disposed on the lower substrate and including a plurality of sub-regions which differently controls an inclination direction of liquid crystal molecules included in the liquid crystal layer for a pixel of the plurality of pixels, and a gate line disposed on the lower substrate and including a portion which overlaps a boundary between adjacent sub-regions of the plurality of sub-regions of the pixel electrode.