Transparent LCD Multi-Layer Electrode Pinhole Prevention
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Solution Overview
Problem
In transparent type liquid crystal display devices, the thinning of pixel electrodes to reduce residual image issues leads to an increase in pinhole defects in the electrode film covering contact holes, compromising display quality.
Innovation Solution
A transparent type liquid crystal display device design featuring a multi-layered electrode structure with a thinner pixel electrode and a specific protective layer configuration that includes a first and second insulation protective layer, with the second layer covering the contact holes to prevent pinhole defects, and a third electrode film that is thinner than the second, ensuring effective coverage and reduced defect formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pixel electrode is thinned to reduce difference in level, then residual image is reduced, but pinhole defect in the electrode film covering the contact hole is increased
Solution Approach 1:
The electrode film covering the contact hole is divided into two separate layers: a first electrode film and a second electrode film. This segmentation allows each layer to have optimized thickness independently, preventing pinhole defects while maintaining the overall thin profile needed to reduce residual images.
Solution Approach 2:
The solution transitions from a single-layer electrode structure to a multi-layer electrode structure, adding a vertical dimension to the design. By stacking multiple thinner layers instead of using one thick layer, the patent achieves both reduced difference in level and reduced pinhole defects.
2Stability of the object's composition
If the pixel electrode is thinned to about 50 nm, then anchoring force weakness is reduced, but pinhole defect in the electrode film is increased
Solution Approach 1:
The electrode film is segmented into multiple layers, allowing the total thickness to be reduced for better anchoring force while each individual layer remains thick enough to avoid pinhole defects during formation.
Solution Approach 2:
Different portions of the electrode structure have different thickness characteristics. The electrode films covering the contact holes maintain sufficient thickness to prevent pinholes, while the overall pixel electrode thickness is reduced to improve anchoring force and reduce residual images.
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 solution effectively suppresses pinhole defects in the electrode film covering contact holes, improving display quality and reducing the risk of residual images and electrical issues, while maintaining the necessary anchoring force for alignment films.
Implementation Method 1
a transparent type liquid crystal display device of an IPS system is configured such that liquid crystal is retained between an array substrate
Implementation Method 2
anchoring force generated by rubbing is weakened in the difference-in-level portion of the alignment film
Data Source
AI summary
A first conductive layer in which a first electrode film is formed, a first protective layer on the first conductive layer, a first hole penetrating through the first protective layer to reach the first electrode film, a second conductive layer including a second electrode film which is disposed on the first protective layer and in contact with a portion of the first electrode film at the bottom of the first hole and the lower electrode, a second protective layer disposed on the second conductive layer and including the insulating film, a second hole disposed on the second protective layer and penetrating through the second protective layer to reach the second electrode film, and a third conductive layer including a third electrode film which is in contact with a portion of the second electrode film at the bottom of the second hole and the upper electrode.