Display Substrate Passivation Layer Alignment for Contrast and Flickering
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Solution Overview
Problem
Conventional liquid-crystal display devices using in-plane switching (IPS) mode suffer from low transparency, low contrast, color shift, and flickering issues, which affect their performance and viewing experience.
Innovation Solution
A display device design featuring a specific positional relationship between the gate electrode and active layer, along with a fringe field switching (FFS) mode with a transparent electrode having multiple finger portions, improves transmittance, contrast, and reduces flickering and color shift by optimizing the structure of passivation layers and electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If in-plane switching (IPS) mode is used to improve viewing angle, then viewing angle is improved, but transparency and contrast deteriorate
Solution Approach 1:
The common electrode is divided into multiple finger-shaped portions that extend in the second direction. This segmentation allows the electric field to be distributed across multiple regions, improving light transmission through the liquid crystal layer while maintaining wide viewing angles. The finger portions create localized electric field regions that control liquid crystal orientation without blocking light paths.
Solution Approach 2:
The patent introduces a vertical dimension to the electrode structure by creating finger portions that extend in the second direction (perpendicular to the gate line direction). This dimensional change allows the common electrode to control liquid crystal molecules across multiple spatial regions simultaneously, improving both viewing angle and transparency by creating a more distributed electric field pattern.
2Adaptability or versatility
If in-plane switching (IPS) mode is used to improve viewing angle, then viewing angle is improved, but contrast deteriorates
Solution Approach 1:
Different regions of the common electrode have different functions: the finger portions extend to control liquid crystal orientation for wide viewing angles, while the openings between finger portions allow light transmission. The pixel electrode's finger-shaped portions are positioned to overlap with specific regions of the common electrode, creating localized control zones that optimize both contrast and viewing angle in different spatial regions.
Solution Approach 2:
The pixel electrode is designed with finger-shaped portions that mirror the structure of the common electrode. This copying creates a complementary pattern where the pixel electrode's fingers align with the common electrode's fingers, enhancing the electric field distribution and improving contrast ratio while maintaining the wide viewing angle characteristics of IPS mode.
3Ease of manufacture
If conventional electrode structure is used, then manufacturing is simple, but photo current leakage occurs
Solution Approach 1:
Multiple passivation layers are introduced as intermediary structures between the common electrode and the liquid crystal layer. These passivation layers serve as mediators that prevent direct contact between electrodes, thereby reducing photo current leakage while maintaining the overall electrode structure and manufacturing process simplicity.
Solution Approach 2:
The electrode structure is nested with multiple protective layers: the common electrode is nested within passivation layers, which are in turn nested within the liquid crystal cell structure. This nested configuration provides multiple barriers against photo current leakage while preserving the fundamental electrode design and manufacturing approach.
4Device complexity
If conventional electrode structure is used, then device complexity is low, but flickering and color shift occur
Solution Approach 1:
The finger-shaped electrode portions create a dynamic electric field distribution that adapts to the liquid crystal molecule orientation. The extended finger structures in the second direction enable more flexible control of the electric field pattern, reducing flickering by maintaining stable liquid crystal alignment and minimizing color shift through improved field uniformity across the pixel area.
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 enhances the display device's performance by reducing photo current leakage, improving contrast and aperture ratio, and minimizing flickering and color shift, resulting in better viewing angles and overall display quality.
Implementation Method 1
a liquid-crystal layer disposed between the common electrode and the pixel electrode
Implementation Method 2
an electric field is transversely applied to control the arrangement of the liquid-crystal molecules
Data Source
AI summary
A display substrate is provided. The display substrate includes a first insulating layer disposed on a substrate, a second insulating layer disposed on the first insulating layer. In particular, the first insulating layer has a first opening and the second insulating layer has a second opening, wherein the first opening and the second opening are partially overlapped. Further, in a cross-sectional view, the first insulating layer corresponding to the first opening has two first bottom ends, and the second insulating layer corresponding to the second opening has two second bottom ends, a location of a first vertical central line between the two first bottom ends is different from a location of a second vertical central line between the two second bottom ends, and the first vertical central line and the second vertical central line are substantially parallel to a normal direction of the surface.