Liquid Crystal Display Electrode Segmentation for Electric Field Shielding
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Solution Overview
Problem
Existing liquid crystal display devices using lateral electric field modes face challenges in maintaining display quality and reducing power consumption due to issues with electric field shielding and alignment of liquid crystal molecules, particularly near gate and source lines.
Innovation Solution
The liquid crystal display device incorporates a specific electrode structure with sub-common electrodes and main-common electrodes on both substrates, forming an oblique electric field that shields unwanted electric fields and maintains alignment, thereby improving display quality and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a pixel electrode covers a gate line to shield the electric field, then the electric field shielding is improved, but the alignment of liquid crystal molecules deteriorates due to oblique electric fields
Solution Approach 1:
The common electrode is divided into two separate electrodes: a first common electrode on the array substrate and a second common electrode on the counter substrate. This segmentation allows each electrode to perform specific functions - the first common electrode shields the gate line electric field, while the second common electrode maintains proper liquid crystal alignment by providing a corresponding electric field component.
Solution Approach 2:
The second common electrode on the counter substrate acts as an intermediary that compensates for the alignment-disturbing effects of the gate line shielding structure. By providing a controlled electric field from the counter substrate side, it mediates between the shielding requirement and the alignment requirement.
2Use of energy by moving object
If lateral electric field mode is used, then power consumption is reduced, but display quality deteriorates due to unwanted electric fields from gate and source lines
Solution Approach 1:
By segmenting the common electrode into two separate electrodes on different substrates, the patent creates a more controlled electric field distribution that maintains the low power consumption benefits of lateral electric field mode while eliminating the display quality issues caused by unwanted electric fields from gate and source lines.
Solution Approach 2:
The first common electrode is positioned to provide localized shielding against gate line electric fields, while the second common electrode provides localized alignment control. This local quality differentiation allows the system to maintain overall display quality while preserving the energy efficiency of lateral electric field mode.
3Object-affected harmful factors
If sub-common electrodes are added to shield electric fields, then electric field control is improved, but device complexity increases
Solution Approach 1:
The patent merges the shielding function and the common electrode function into a unified two-electrode system. Rather than adding separate shielding electrodes, the common electrode itself is divided to perform both shielding and alignment control functions, reducing overall device complexity.
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 display quality by forming multiple domains within each pixel, improving transmissivity and reducing the impact of unwanted electric fields, while also minimizing power consumption and maintaining a wide viewing angle.
Implementation Method 1
Liquid crystal molecules are switched by the lateral electric field substantially in parallel with the principal surface of the array substrate
Implementation Method 2
a liquid crystal display device includes: a first substrate including; a gate line extending in a first direction, a source line extending in a second direction orthogonally crossing the first direction, a switching element electrically connected with the gate line and the source line, a first interlayer insulating film covering the switching element, a first sub-common electrode formed on the first interlayer insulating film and extending in the first direction, the first sub-common electrode facing the gate line
Data Source
AI summary
A first substrate includes a gate line extending in a first direction and a source line extending in a second direction. A first sub-common electrode is formed on the gate line. A first main-common electrode is formed along the source line so as to be connected with the first sub-common electrode. A second main-common electrode is formed extending in the second direction and facing the source line. The second main-common electrode is set to the same potential as the first main-common electrode. A second substrate includes a third main-common electrode extending in the second direction so as to face the second main-common electrode. The third main-common electrode is set to the same potential as the second main-common electrode. A second sub-common electrode is connected with the third main common electrode. The second sub-common electrode is formed so as to face the first sub-common electrode on the gate line.