Stepped Bridge Electrode Layout for Display Pixel Isolation
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Solution Overview
Problem
Existing display devices face challenges in ensuring effective electrical isolation and preventing short circuits between bridge electrodes and pixel electrodes, leading to potential leakage currents and reduced display quality.
Innovation Solution
The display device incorporates a design with bridge electrodes of varying widths and a protecting insulating layer covering their side surfaces, along with a side insulating layer covering the pixel electrodes, to prevent short circuits and leakage currents, eliminating the need for additional masks in the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bridge electrodes are used to connect transistors to pixel electrodes, then electrical connection is achieved, but short circuits and leakage currents occur due to insufficient isolation
Solution Approach 1:
The bridge electrode is divided into two distinct parts: a first bridge electrode with a first width and a second bridge electrode with a second width greater than the first width. This segmentation creates a stepped configuration that enhances electrical isolation between adjacent pixels while maintaining proper electrical connection, thereby preventing short circuits and leakage currents.
Solution Approach 2:
The invention introduces a width dimension variation to the bridge electrode structure by creating a stepped configuration where the second bridge electrode has a greater width than the first bridge electrode. This dimensional change provides additional isolation space without increasing the overall area footprint, effectively preventing leakage currents while maintaining connectivity.
2Reliability
If additional insulating layers and structural modifications are added to prevent short circuits, then electrical isolation is improved, but manufacturing complexity increases
Solution Approach 1:
The invention combines the bridge electrode structure with the pixel electrode formation process into a single integrated manufacturing step. The first and second bridge electrodes are formed simultaneously with the pixel electrodes, eliminating the need for separate masking and deposition steps that would otherwise be required to create isolation structures. This merging reduces manufacturing complexity while maintaining enhanced electrical isolation.
Solution Approach 2:
The stepped bridge electrode structure serves multiple functions simultaneously: it provides electrical connection between the transistor and pixel electrode, creates electrical isolation between adjacent pixels, and defines the pixel electrode pattern. This multi-functionality eliminates the need for additional dedicated isolation structures and simplifies the overall manufacturing process.
Data Source
AI summary
A display device includes: a substrate including a first pixel area and a second pixel area spaced apart from the first pixel area in a first direction, a first transistor disposed on the substrate, a first bridge electrode disposed in the first pixel area on the first transistor and electrically connected to the first transistor, a second bridge electrode disposed on the first bridge electrode, and a first electrode disposed on the second bridge electrode.