Array Substrate Light Blocking Structure for Display Edge Quality
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Solution Overview
Problem
Liquid crystal display devices face challenges in display quality due to weak electric fields at the edges of pixel electrodes, which hinder liquid crystal molecule deflection and affect image display.
Innovation Solution
The array substrate design includes a common electrode line and extension portions of the drain electrode that form a light blocking structure around the pixel electrode, ensuring that the orthographic projections of these components do not overlap with the pixel electrode, thereby creating a more effective light blocking structure to enhance display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional pixel electrode structure is used, then the device structure is simple, but the electric field at the edge of the pixel electrode is weak causing poor display quality
Solution Approach 1:
The pixel electrode is segmented into a light blocking structure with multiple parts: a first light blocking portion and a second light blocking portion extending from opposite sides of the pixel electrode. This segmentation creates enhanced edge electric fields without requiring complete structural redesign, thereby improving display quality while maintaining reasonable complexity
Solution Approach 2:
The light blocking structure is positioned specifically at the edges of the pixel electrode where the electric field is weakest. By concentrating the light blocking portions at these critical locations rather than uniformly across the entire electrode, the invention locally enhances the electric field strength where it is most needed, improving edge display quality without proportionally increasing overall device complexity
2Manufacturing precision
If the common electrode line overlaps with the pixel electrode, then the manufacturing process is simpler, but light leakage occurs reducing display quality
Solution Approach 1:
The common electrode line is extracted from its conventional position that would overlap with the pixel electrode. Instead, it is routed through the light blocking structure, specifically through the second light blocking portion. This extraction eliminates the harmful overlap that causes light leakage while the routing path is carefully designed to minimize additional layout complexity
Solution Approach 2:
The light blocking structure serves as an intermediary element between the pixel electrode and the common electrode line. By positioning the common electrode line to pass through the light blocking portions rather than directly overlapping with the pixel electrode, the light blocking structure mediates the interaction between these two electrodes, preventing light leakage while maintaining electrical functionality
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 light blocking structure effectively reduces light leakage at the edges of the pixel electrode, improving the overall display quality by ensuring that the electric field is stronger and more uniform, leading to better liquid crystal molecule deflection and image display.
Implementation Method 1
The light blocking structure effectively reduces light leakage at the edges of the pixel electrode
Implementation Method 2
An electric field is formed between the pixel electrode and the common electrode. A liquid crystal molecule is deflected by changing a voltage of the electric field
Data Source
AI summary
Embodiments of the present disclosure provide an array substrate and a display device. The array substrate includes a plurality of gate lines and a plurality of data lines, the plurality of gate lines and the plurality of data lines crossing one another to bound pixel units and the pixel unites each including a pixel electrode and a thin film transistor, which includes a drain electrode, the array substrate further includes a common electrode line, the drain electrode includes an extension portion and the common electrode line and the extension portion form a light blocking structure together such that an orthographic projection of the light blocking structure on a plane where the pixel electrode is located is located near an edge of the pixel electrode. The array substrate provided by the present disclosure is applied to a display device.