LCD Panel Shield Electrode Notch Design
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Solution Overview
Problem
Conventional liquid crystal display devices, such as TN mode devices, suffer from deteriorated image quality and high dependence on viewing angles, making them unsuitable for applications where the display is viewed from directions other than the front, and existing solutions like MVA mode devices face limitations in optimizing picture element electrode and slit region shapes for effective orientation separation of liquid crystal molecules.
Innovation Solution
A liquid crystal display panel configuration where picture element electrodes overlap scanning signal lines and include notch parts, with a shield electrode formed in the data signal line layer to partially overlap the scanning signal lines, effectively suppressing orientation disorders and improving display quality by blocking light leaks and allowing optimal electrode shapes for orientation separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If picture element electrodes and scanning signal lines are arranged in conventional layers without overlap, then manufacturing is simpler, but orientation disorders occur causing light leaks and deteriorated display quality
Solution Approach 1:
The patent introduces a new spatial dimension by overlapping the picture element electrode layer with the scanning signal line layer in the vertical direction. This dimensional arrangement allows the picture element electrodes to physically cover and shield the scanning signal lines, preventing orientation disorders without requiring lateral separation or additional buffer layers.
Solution Approach 2:
The patent introduces a shield electrode as an intermediary element between the picture element electrode and the scanning signal line. This shield electrode, positioned in the data signal line layer, acts as a mediator to further suppress any residual orientation disorders caused by the scanning signal line's electric field, enhancing the overall shielding effect.
2Reliability
If picture element electrodes are designed with optimal shapes for orientation separation, then liquid crystal orientation is improved, but the electrode design becomes more complex
Solution Approach 1:
The patent segments the picture element electrode into multiple regions by introducing notch parts that correspond to the positions of scanning signal lines. This segmentation creates distinct zones: regions where the electrode overlaps with scanning signal lines for shielding, and regions without notches for optimal liquid crystal orientation control. The segmented design allows each region to serve its specific function effectively.
Solution Approach 2:
The patent applies local quality by giving different shapes to different parts of the picture element electrode. Specifically, notch parts are introduced at locations corresponding to scanning signal lines to provide shielding, while other regions maintain continuous electrode structures for optimal liquid crystal orientation. This localized modification allows the electrode to simultaneously achieve both shielding and orientation control functions.
3Reliability
If shield electrode is added to suppress orientation disorders, then display quality improves, but parasitic capacitance increases
Solution Approach 1:
The patent applies partial action by introducing notch parts in the picture element electrode at specific locations corresponding to scanning signal lines, rather than creating a complete continuous electrode structure. This partial shielding approach provides sufficient protection against orientation disorders while minimizing the total electrode area and thus reducing parasitic capacitance compared to a full shield electrode configuration.
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 configuration achieves a wide viewing angle characteristic and high-quality display by reducing orientation disorders and light leaks, enhancing contrast and reducing afterimages, while allowing for optimal electrode design and reduced parasitic capacitance.
Implementation Method 1
blocking light leaks
Implementation Method 2
liquid crystal molecules can be oriented in multiple directions
Data Source
AI summary
Picture element electrodes (7) are electrically connected with drain electrodes (18D) of respective transistor elements (18). The picture element electrodes (7) and data signal lines (SLn, SLn+1, . . . ) are provided above scanning signal lines (GLn, GLn+1, . . . ). The picture element electrodes (7) overlap scanning signal lines (GLn, GLn+1, . . . ) when viewed from above. Notch parts 7a and 7b are provided in each picture element electrode (7) so as to overlap each of the scanning signal lines (GLn, GLn+1, . . . ). Shield electrodes (4a, 4b) are formed in the same layer as the data signal lines (SLn, SLn+1, . . . ). Each of the scanning signal lines (GLn, GLn+1, . . . ) at least partially overlaps the shield electrodes (4a, 4b) in the notch parts (7a, 7b), when viewed from above. This provides the liquid crystal display panel having wide viewing angle characteristic and carrying out high quality display.