Electro-optical Substrate Protruding Conducting Layer Opening Ratio
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Solution Overview
Problem
Liquid crystal devices face challenges in increasing the opening ratio to enhance image quality, as reducing the width of interconnects and elements in the non-opening region makes it difficult to secure space for connectors and maintain alignment margins, affecting the manufacturing process and design.
Innovation Solution
The electro-optical device substrate features a conducting layer with a protruding portion into the opening region, allowing for a narrower non-opening region and increased opening ratio, while maintaining electrical connections between the pixel electrode and hold capacitor, and incorporating a hold capacitor with a dielectric film and contact portions to secure potential holding capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the widths of interconnects and elements in the non-opening region are reduced to increase the opening ratio, then the opening ratio and image quality are improved, but it becomes difficult to secure space for connectors and maintain alignment margins
Solution Approach 1:
The conducting layer is extended in the vertical dimension by creating a protruding portion that protrudes into the opening region from the non-opening region. This vertical extension allows the connector to be formed with sufficient dimensions even when the horizontal width of the non-opening region is reduced, thereby resolving the contradiction between increasing opening ratio and maintaining manufacturing precision.
Solution Approach 2:
The conducting layer is segmented into two functional portions: a base portion in the non-opening region for electrical connection to the hold capacitor, and a protruding portion extending into the opening region to provide adequate space for connector formation. This segmentation allows each portion to optimize its function independently, maintaining alignment margins while increasing the opening ratio.
2Area of moving object
If the widths of interconnects and elements in the non-opening region are reduced to increase the opening ratio, then the opening ratio is improved, but it becomes difficult to secure space for connectors such as contact holes
Solution Approach 1:
The conducting layer creates a protruding portion that extends vertically into the opening region, providing adequate horizontal space for connectors in the opening region while the base portion remains in the non-opening region for electrical connection. This dimensional transition allows connector space to be secured without increasing the overall width of the non-opening region.
Solution Approach 2:
The protruding portion of the conducting layer acts as an intermediary structure that bridges the non-opening region and the opening region. It provides a transition zone that allows connectors to be formed with sufficient dimensions in the opening region while maintaining electrical connection to the hold capacitor through the base portion in the non-opening region.
3Area of moving object
If the non-opening region width is reduced to increase the opening ratio, then the opening ratio and image quality are improved, but the electrical connection between hold capacitor and pixel electrode becomes more difficult to secure
Solution Approach 1:
The conducting layer is segmented into a base portion in the non-opening region that ensures electrical connection to the hold capacitor, and a protruding portion in the opening region that provides connection space. This segmentation ensures that electrical connection reliability is maintained through the base portion while the protruding portion provides adequate space for connector formation.
Solution Approach 2:
The conducting layer extends vertically by creating a protruding portion that protrudes into the opening region. This vertical extension maintains the electrical connection function in the non-opening region while providing additional horizontal space in the opening region for secure connector formation, thereby maintaining reliability while increasing opening ratio.
Data Source
AI summary
An electro-optical device substrate includes a substrate, a plurality of data lines and a plurality of scanning lines crossing each other on the substrate, and a plurality of pixels defined by the plurality of data lines and the plurality of scanning lines so as to correspond to intersections thereof. Each pixel includes a pixel electrode, a conducting layer formed in a non-opening region separating an opening region of the pixel from that of another pixel, the conducting layer having a protruding portion protruding into the opening region from a part of one of a plurality of region edges defining the opening region, and a first contact portion electrically connecting the pixel electrode and the protruding portion.