Lateral Field LCD Electrode Segmentation for Wide Viewing Angles
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Solution Overview
Problem
Existing liquid crystal display devices using lateral electric field modes face challenges in achieving high resolution and wide viewing angles while maintaining image quality, particularly due to limitations in pixel pitch and electrode configurations.
Innovation Solution
The liquid crystal display device employs a unique pixel electrode and common electrode arrangement on substrates, forming L or S character shapes to create multiple domains within each pixel, allowing for efficient lateral electric field distribution and alignment of liquid crystal molecules, which enhances viewing angles and suppresses gradation reversal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lateral electric field mode structures are used, then the device achieves light weight and thin shape, but high resolution and wide viewing angles cannot be simultaneously achieved
Solution Approach 1:
The pixel electrode is divided into multiple electrode regions (first electrode region, second electrode region, third electrode region) with different orientations. This segmentation allows different regions to control liquid crystal molecules in different orientations, achieving multiple domains within a single pixel that provide both high resolution and wide viewing angles simultaneously.
Solution Approach 2:
Different portions of the pixel electrode are assigned different functional qualities - the first electrode region has a first orientation for controlling liquid crystal alignment in one direction, while the second and third electrode regions have a second orientation perpendicular to the first. This local differentiation of electrode properties enables simultaneous achievement of high resolution through precise local control and wide viewing angles through multiple orientation domains.
2Manufacturing precision
If pixel pitch is reduced for high resolution, then resolution improves, but electrode configuration becomes more complex and difficult to manufacture
Solution Approach 1:
The pixel electrode is segmented into multiple electrode regions with different orientations, allowing high resolution to be achieved through functional differentiation rather than simply reducing pixel pitch. This segmentation enables complex electrode configurations to be managed through systematic regional division rather than random complexity.
Solution Approach 2:
The pixel electrode serves multiple functions simultaneously - it acts as both a common electrode for the entire pixel and as individually oriented electrode regions for specific liquid crystal alignment control. This multi-functionality reduces the need for separate dedicated electrodes for each function, simplifying the overall configuration while achieving high resolution.
3Manufacturing precision
If assembly shifts occur during manufacturing, then alignment precision deteriorates, but image quality is maintained through domain structure
Solution Approach 1:
The pixel electrode is divided into multiple electrode regions with different orientations, creating multiple domains within each pixel. This segmentation provides redundancy - if assembly shifts occur during manufacturing, the multiple oriented regions ensure that at least some domains maintain proper alignment, thereby maintaining overall image quality despite manufacturing variations.
Solution Approach 2:
The multi-domain electrode configuration acts as a preemptive buffer against assembly shift problems. By pre-establishing multiple oriented electrode regions before assembly, the design compensates for potential alignment issues that may arise during the assembly process, ensuring image quality remains stable even when manufacturing precision varies.
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 enables a wide viewing angle with high resolution and minimizes the impact of assembly shifts, resulting in a high-quality display with reduced transmissivity variations and the ability to use non-transparent conductive materials for electrodes.
Implementation Method 1
a liquid crystal display device equipped with pixel electrodes and a common electrode formed in an array substrate, respectively. Liquid crystal molecules are switched by the lateral electric field substantially in parallel with the principal surface of the array substrate.
Implementation Method 2
Liquid crystal molecules are switched by the lateral electric field substantially in parallel with the principal surface of the array substrate.
Data Source
AI summary
In one embodiment, a first substrate includes a sub-pixel electrode extending in a first direction, a first main pixel electrode connected with one end of the sub-pixel electrode and extending in a second direction orthogonally crossing the first direction, and a second main pixel electrode connected with the other end of the sub-pixel electrode and extending in the second direction. A second substrate includes first and second sub-common electrodes arranged on both sides sandwiching the sub-pixel electrode, a first main common electrode connected with the first sub-common electrode and extending along the second direction opposite to the extending direction of the first main pixel electrode on one end side of the sub-pixel electrode, and a second main common electrode connected with the second sub-common electrode and extending along the second direction opposite to the extending direction of the second main pixel electrode on the other end side of the sub-pixel electrode.