Frame-Shaped Connection Electrode Shields Wiring Lines in LCD
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In liquid crystal display devices operating in the multi-domain vertically aligned mode, electric fields from bus lines leak through slits in pixel electrodes, causing light leakage and display issues like crosstalk, especially when displaying a white rectangle on a full black screen.
Innovation Solution
The implementation of pixel electrodes with a frame-shaped connection electrode that overlays and shields the wiring lines, preventing electric field leakage and maintaining a stable vertical electric field, thereby preventing liquid crystal molecule orientation disturbance and light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If slits are provided in pixel electrodes to disperse liquid crystal molecule inclination directions, then viewing angle characteristics are improved, but electric field leakage through slits causes light leakage and crosstalk
Solution Approach 1:
A frame-shaped connection electrode is introduced as an intermediary component between the pixel electrode and the underlying bus lines. This connection electrode overlays the bus lines and acts as a shield, preventing electric field leakage through the slits while maintaining the viewing angle benefits of the slit structure.
Solution Approach 2:
The pixel electrode is divided into multiple electrode bodies separated by slits, with a frame-shaped connection electrode connecting them. This segmentation allows the electrode bodies to be positioned at different locations (including corners) to improve viewing angles, while the frame structure provides continuous shielding over the bus lines.
2Device complexity
If bus lines are disposed underneath pixel electrodes, then wiring complexity is reduced, but electric field from bus lines leaks through slits and disturbs liquid crystal orientation
Solution Approach 1:
The frame-shaped connection electrode serves as a shielding intermediary between the bus lines and the liquid crystal molecules. It blocks the electric field from the bus lines from leaking through the slits and disturbing the liquid crystal orientation, while allowing the simple wiring arrangement to be maintained.
3Object-generated harmful factors
If electrode bodies are arranged to overlay bus lines, then electric field shielding is improved, but manufacturing precision requirements increase
Solution Approach 1:
The electrode structure is segmented into multiple electrode bodies that can be independently positioned to overlay bus lines. This segmentation allows the shielding function to be distributed across multiple points, reducing the precision requirement for any single electrode body while maintaining overall shielding effectiveness.
Solution Approach 2:
Electrode bodies are asymmetrically positioned at different locations within the pixel electrode, including corner positions, to optimally shield different bus lines. This asymmetric arrangement provides effective shielding while accommodating manufacturing tolerances.
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 achieves high-contrast display characteristics by preventing electric field leakage, ensuring accurate black display and reducing crosstalk, thereby enhancing the viewing angle characteristics and overall display quality.
Implementation Method 1
disposing the frame-shaped connection electrode in such a way that it overlays the wiring line connected to a thin-film transistor for driving the corresponding pixel electrode allows the connection electrode to shield the wiring line and hence prevents the electric field resulting from the voltage applied to the wiring line from leaking through the slits
Implementation Method 2
applying voltages to the pixel electrodes causes liquid crystal molecules having negative dielectric anisotropy to be aligned with and inclined in the direction in which the electrode bodies extend
Data Source
AI summary
A liquid crystal display device includes: a plurality of pixel electrodes formed of a frame-shaped connection electrode and electrode bodies arranged in parallel to one another in a frame of the connection electrode and supported by and connected to the connection electrode; and a common electrode insulated from the plurality of pixel electrodes.