Array Substrate Via Isolation for Offset Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional array substrates for liquid crystal display devices in HADS mode often result in display abnormalities due to pixel electrode offsets, where the pixel electrode overlaps with the via, causing the common electrode to conduct with it, leading to abnormal pixel displays.
Innovation Solution
The method involves forming a via with a first edge adjacent to the pixel electrode and a second edge not adjacent to it, and during the common electrode patterning process, etching an isolated region at the first edge to prevent the pixel electrode from connecting with the common electrode, ensuring proper signal transmission and avoiding display abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pixel electrode is formed without precise positioning, then the manufacturing process is simpler and faster, but the pixel electrode may offset and contact the common electrode causing display abnormalities
Solution Approach 1:
The patent applies preliminary action by forming an isolated region in the common electrode before the pixel electrode is fully positioned. This isolated region is created during the common electrode patterning step, before pixel electrode deposition. The isolated region acts as a pre-prepared safety zone that will prevent any potential contact between the pixel electrode and common electrode, regardless of positioning variations. This resolves the contradiction by establishing protective structure in advance, allowing simpler manufacturing without compromising reliability.
Solution Approach 2:
The patent applies preliminary anti-action by creating an isolated region that preemptively counteracts the potential harmful effect of pixel electrode offset. The isolated region is designed to be positioned such that even if the pixel electrode shifts during manufacturing, it cannot bridge across the isolated region to contact the common electrode. This preliminary protective measure eliminates the need for extremely precise positioning while ensuring display normality, thus resolving the technical contradiction between manufacturing speed and display reliability.
2Reliability
If the via is made larger to ensure connection to the common electrode line, then the electrical connection is more reliable, but the pixel electrode may be exposed within the via and contact the common electrode
Solution Approach 1:
The patent applies segmentation by dividing the common electrode into two distinct regions: a connected region that maintains electrical connection to the common electrode line, and an isolated region that is electrically separated. The isolated region is created within the via area, effectively segmenting the via into a connection zone and a protected zone. This allows the via to be made larger for reliable connection while the isolated region prevents harmful contact between the pixel electrode and common electrode, resolving the contradiction between connection reliability and preventing unintended contact.
Solution Approach 2:
The patent applies local quality by creating a specific isolated region with different electrical properties within the via structure. The isolated region has no electrical connection to the common electrode line, while other portions of the common electrode maintain proper connection. This localized differentiation allows the via to serve dual purposes: ensuring reliable electrical connection through the connected region while preventing harmful contact through the isolated region, thus resolving the contradiction between connection reliability and preventing unintended electrode contact.
3Strength
If the common electrode is formed to fully cover the via, then the common electrode connection is more robust, but the pixel electrode offset may cause abnormal display due to exposure within the via
Solution Approach 1:
The patent applies segmentation by dividing the common electrode coverage over the via into two functional zones: a connected region that provides robust electrical connection to the common electrode line, and an isolated region that is electrically separated and positioned to prevent pixel electrode contact. The isolated region is created within the via area, allowing the common electrode to extend fully over the via for strong connection while the segmented isolated region prevents harmful contact even if the pixel electrode offsets, thus resolving the contradiction between connection strength and display normality.
Solution Approach 2:
The patent applies the intermediary principle by introducing an isolated region as a mediating structure between the common electrode and the pixel electrode. The isolated region acts as an intermediate zone that is part of the common electrode structure but electrically isolated, serving as a buffer that prevents direct contact between the common electrode and pixel electrode. This intermediary structure allows the common electrode to maintain full coverage for robust connection while preventing display abnormalities, resolving the contradiction between connection strength and display normality.
Data Source
AI summary
The present disclosure provides an array substrate, manufacturing method thereof and a display device. A method of manufacturing an array substrate includes: sequentially forming a common electrode line, a first insulating layer, a pixel electrode, and a second insulating layer, and forming a via that is in communication with the common electrode line. The method further comprises, after forming the via, forming a common electrode that covers the via through a patterning process, wherein the patterning process includes etching a portion of the via covered with the common electrode to form an isolated region. The isolated region includes a region at an inner side of a first edge of the via. The first edge is an edge of the via adjacent to or stacked with the pixel electrode. The via further includes a second edge that is neither adjacent to nor stacked with the pixel electrode.