Array Substrate Pixel Electrode Segmentation for Mura Reduction
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Solution Overview
Problem
The dual-domain technology in liquid crystal display technologies leads to trace mura and light leak phenomena due to the interaction of liquid crystal molecules at the junctions of pixel electrodes, affecting display quality and causing black disclination lines and reduced light transmittance.
Innovation Solution
The array substrate is designed with each pixel region divided into a first light transmission region, a second light transmission region, and a light shielding region, where the thin film transistor is placed in the light shielding region, and the data lines are structured to eliminate corner regions, ensuring liquid crystal molecules are within the shielding area and preventing light leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dual-domain technology is used with pixel electrode having upper portion A and lower portion B, then viewing angle is improved, but black disclination lines and trace mura phenomenon occur at the joint region
Solution Approach 1:
The pixel electrode is divided into multiple independent electrode regions (first electrode region, second electrode region, third electrode region) instead of using a single continuous pixel electrode with corner joints. This segmentation eliminates the corner region where liquid crystal molecules experience conflicting electric fields, thereby preventing black disclination lines and trace mura phenomenon while maintaining the dual-domain wide viewing angle capability
Solution Approach 2:
The problematic corner region where the joint between upper and lower portions of the pixel electrode creates harmful effects is completely removed from the structure. By extracting this problematic region and replacing it with a light-shielding region, the invention eliminates the source of black disclination lines and trace mura while preserving the beneficial wide viewing angle characteristics
2Reliability
If data line is made of light-impermeable material to ensure electrical connection, then electrical conductivity is improved, but light leak phenomenon occurs at the corner region of data line
Solution Approach 1:
The data line structure is redesigned to extend into the light-shielding region, utilizing the vertical dimension (depth into the substrate) to route the light-impermeable data line through an area that is optically hidden. This allows the data line to maintain its electrical function while being positioned in a region that does not affect light transmission through the display panel
Solution Approach 2:
The light-shielding region acts as an intermediary structure that separates the electrical function (data line) from the optical function (light transmission). By placing the light-impermeable data line within or adjacent to the light-shielding region, the invention allows the data line to perform its electrical connection function without causing light leak phenomena in the visible display area
Data Source
AI summary
An array substrate, including: data lines, scan lines intersecting the data lines; and a plurality of pixel regions; where each of the plurality of pixel regions includes first and second light transmission regions and a light shielding region between the first and second light transmission regions, a first electrode is disposed in the first light transmission region, a second electrode is disposed in the second light transmission region, and a thin film transistor is disposed in the light shielding region, where a drain electrode of the thin film transistor is electrically connected with the first electrode and the second electrode; the data line corresponding to each of the plurality of pixel regions includes a first portion and a second portion extending in two different directions, respectively, the first portion is connected with the second portion via a first connection portion located at the light shielding region.