Liquid Crystal Display Window Opening for Disclination Prevention
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Solution Overview
Problem
Liquid crystal display devices face issues with disclination and transmittance reduction due to the formation of arc-shaped electric field openings, leading to display quality limitations, particularly in FFS mode where the electric field pattern causes inconsistent liquid crystal molecule rotation and potential short circuits from multi-level structures.
Innovation Solution
A liquid crystal display device configuration featuring a window-shaped opening part in the lower electrode, overlapping with the electric field opening part in the upper electrode, which suppresses disclination by avoiding arc-shaped electric field applications and reduces the risk of short circuits by positioning the window-shaped opening part inside the outer circumferential end of the upper electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thin and long groove shaped opening part with closed end portions is formed in the upper electrode, then the electric field can be effectively controlled for FFS mode operation, but the edge portions of the opening part become arc-shaped due to etching limitations, causing disclination and reduced transmittance
Solution Approach 1:
The opening part is divided into multiple segments along its length, with each segment having a controlled arc-shaped end portion. By segmenting the opening part, the patent manages the disclination issue locally at each segment endpoint while maintaining overall FFS mode functionality. The segmentation allows precise control of electric field distribution in each segment region.
Solution Approach 2:
The patent applies different geometric characteristics to different portions of the opening part. Specifically, the end portions are designed with arc shapes to match etching capabilities, while the intermediate portions maintain straight edges for proper electric field control. This local differentiation of geometric properties resolves the conflict between manufacturing precision and display quality.
2Ease of manufacture
If the window-shaped opening part is formed for connecting upper electrode wiring, then electrical connectivity is achieved, but the multi-level structure around the opening part creates potential short circuit paths
Solution Approach 1:
An insulating film is introduced as an intermediary layer between the upper electrode and the lower electrode around the window-shaped opening part. This insulating film fills the multi-level structure and prevents direct electrical contact that would cause short circuits, while still allowing the wiring connection to function through the opening part.
Solution Approach 2:
The patent proactively addresses the short circuit risk by pre-filling the multi-level structure around the window-shaped opening part with insulating material during the manufacturing process. This beforehand cushioning prevents potential short circuits before they can occur during device operation.
3Ease of manufacture
If arc-shaped end portions are formed in the opening part, then etching process limitations are accommodated, but the electric field follows the arc pattern causing liquid crystal molecules to rotate in inconsistent directions
Solution Approach 1:
The opening part is designed with heterogeneous geometric properties: arc-shaped end portions for manufacturability and straight intermediate portions for alignment stability. This local quality differentiation ensures that only the necessary end portions have arcs, while the majority of the opening part maintains straight edges for consistent liquid crystal molecule rotation.
Solution Approach 2:
The patent carefully controls the parameters of the arc-shaped portions, specifically limiting their size and position to the end regions only. By adjusting these geometric parameters, the patent minimizes the impact of arc-induced electric field distortion on the overall liquid crystal alignment while maintaining etching process feasibility.
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 preventing disclination and ensuring uniform electric field distribution, thereby improving transmittance and reducing the likelihood of short circuits in multi-level structures.
Implementation Method 1
an electric field opening part for passing an electric field is formed in the upper electrode and liquid crystal molecules are driven by applying a voltage between the upper and lower electrodes
Data Source
AI summary
A liquid crystal display device includes an upper electrode and a lower electrode interposing an insulation layer therebetween, wherein an electric field opening part for passing an electric field is formed in the upper electrode and liquid crystal molecules are driven by applying a voltage between the lower electrode and the upper electrode, wherein a window-shaped opening part formed by partially removing the lower electrode for connecting an upper electrode wiring and the upper electrode, which interpose an interlayer insulation film therebetween, together is disposed in a lower part of the lower electrode, and wherein one end portion of the electric field opening part in the longitudinal direction around the window-shaped opening part is disposed to be overlapped with the window-shaped opening part in a plan view.