Pixel Array Substrate Conductive Pattern for Narrow Bezel Displays
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Solution Overview
Problem
Current ultra-narrow bezel display devices face challenges such as display abnormalities like diagonal bright lines and low aperture ratio, due to the placement of gate driving circuits which affect pixel structures, and are prone to bubble formation.
Innovation Solution
A pixel array substrate design with a specific configuration of conductive patterns, insulating layers, and pixel structures that include multiple common electrodes and a unique arrangement of scan, data, and transfer lines to minimize capacitive coupling effects and improve aperture ratio, reducing the occurrence of display abnormalities and bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the gate driving circuit is disposed on the lower side of the display region to reduce bezel width, then the bezel width is reduced, but display abnormalities such as diagonal bright lines occur due to capacitive coupling from transfer lines
Solution Approach 1:
The gate driving circuit is divided into multiple segments (first gate driving circuit and second gate driving circuit) disposed at different locations (lower side and right side of display region), with scan lines segmented into corresponding groups. This segmentation reduces capacitive coupling effects by distributing the gate driving functions across separate physical locations, eliminating the diagonal bright line defect while maintaining narrow bezel design.
Solution Approach 2:
A common electrode is introduced as an intermediary element between the pixel electrode and the gate driving circuits. The common electrode forms a storage capacitor with the pixel electrode, providing electrical isolation and reducing the impact of capacitive coupling from transfer lines. This intermediary structure prevents display abnormalities while enabling the gate driving circuit to be positioned at the lower side for narrow bezel implementation.
2Reliability
If the aperture ratio is increased to improve display performance, then the display quality is improved, but the device becomes more prone to bubble formation
Solution Approach 1:
The conductive pattern is designed with varying local properties: it has a first portion covering the common electrode and a second portion with different characteristics. This local quality variation optimizes the electrical field distribution within the pixel structure, maintaining high aperture ratio for improved display quality while the specific configuration of the second portion prevents bubble formation by controlling the liquid crystal alignment and reducing stress concentration points.
3Reliability
If the conductive pattern is designed to cover all edges of the common electrode to improve electrical connection, then the electrical connectivity is improved, but the manufacturing complexity increases
Solution Approach 1:
The conductive pattern merges multiple functions into a single integrated structure: it serves as both the electrode connection layer and the storage capacitor formation layer. By combining these functions, the conductive pattern achieves comprehensive edge coverage of the common electrode for improved electrical connectivity while avoiding the need for separate complex structures, thus reducing manufacturing complexity.
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 design enhances the aperture ratio of the display device, reduces the likelihood of display abnormalities like diagonal bright lines, and minimizes bubble formation, thereby improving the overall performance and appearance of ultra-narrow bezel displays.
Implementation Method 1
A first portion of the conductive pattern is disposed on the first common electrode... The pixel electrode is disposed on the second insulating layer and is electrically connected to the conductive pattern through the opening of the first insulating layer and the opening of the second insulating layer
Data Source
AI summary
A pixel array substrate, including multiple pixel structures, is provided. Each of the pixel structures includes a first common electrode, a thin film transistor, a conductive pattern, a first insulating layer, a color filter pattern, a second insulating layer, and a pixel electrode. The conductive pattern is electrically connected to the thin film transistor. A first portion of the conductive pattern is disposed on the first common electrode. The first insulating layer is disposed on the conductive pattern. The color filter pattern is disposed on the first insulating layer. The second insulating layer is disposed on the color filter pattern. The pixel electrode is disposed on the second insulating layer. In a top view of the pixel array substrate, the first portion of the conductive pattern covers all edges of the first common electrode within an opening of the color filter pattern.