Pixel Electrode Gap Design for LCD Transmittance and Response Speed
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display devices with vertically aligned mode suffer from degraded response speed and unwanted texture due to fine slits in field generating electrodes, which affect lateral viewing characteristics and transmittance.
Innovation Solution
A liquid crystal display device design featuring a pixel electrode with a central electrode, fine branch portions, and an outer portion spaced apart from the fine branch portions, along with a cross-shaped opening in the common electrode, to improve liquid crystal control force and transmittance by offsetting fringe fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If fine slits are cut in the pixel electrode to induce tilt directions of liquid crystal molecules, then lateral viewing characteristics are improved, but response speed is degraded
Solution Approach 1:
The pixel electrode is segmented into multiple independent branch electrodes with fine slits between them. This segmentation allows each branch to independently control liquid crystal molecules in its region, maintaining response speed while the collective arrangement improves lateral viewing characteristics through multi-directional tilt induction.
Solution Approach 2:
The invention introduces a temporal dimension to the problem by controlling the sequential switching of different branch electrodes. This allows liquid crystal molecules to be tilted in various directions over time, achieving improved lateral viewing characteristics without the continuous interference that would degrade response speed.
2Stability of the object's composition
If fine slits are formed in the pixel electrode, then liquid crystal alignment in multiple directions is achieved, but unwanted texture is displayed for a predetermined period
Solution Approach 1:
The invention makes the liquid crystal alignment dynamic by enabling continuous reconfiguration through the independent control of multiple branch electrodes. This dynamic control allows the system to transition from an unstable textured state to a stable aligned state more quickly, reducing the predetermined period during which unwanted texture is displayed.
Solution Approach 2:
The invention implements feedback control by monitoring the alignment state of liquid crystal molecules and adjusting the voltage applied to different branch electrodes accordingly. This feedback mechanism accelerates the transition from unwanted texture to proper alignment, reducing the time the texture persists.
3Ease of manufacture
If the outer portion is connected directly to the fine branch portion, then manufacturing is simplified, but fringe fields are not effectively offset and transmittance is reduced
Solution Approach 1:
The invention introduces a gap as an intermediary element between the outer portion and the fine branch portion. This gap acts as a mediator that effectively offsets fringe fields by creating a controlled discontinuity in the electrode structure, thereby improving transmittance while maintaining manufacturability through standard fabrication processes.
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
Enhances lateral viewability and transmittance by maintaining consistent alignment angles of liquid crystal molecules across the pixel electrode, reducing dark portions and improving image clarity from various angles.
Implementation Method 1
liquid crystal control force at an edge of the pixel electrode may be improved to thereby improve transmittance... maintaining consistent alignment angles of liquid crystal molecules across the pixel electrode
Data Source
AI summary
A liquid crystal display device includes: a first substrate; a pixel electrode formed on the first substrate; a second substrate corresponding to the first substrate; and a common electrode formed on the second substrate. The pixel electrode includes: a central electrode, an outer portion connected to the central electrode and extending along an edge of the pixel electrode; and a fine branch portion extending from a side of the central electrode and spaced apart from the outer portion, wherein a cross-shaped opening is formed in the common electrode.