Light Emitting Pixel Storage Capacitor Segmentation
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Solution Overview
Problem
The yield of light emitting pixels in electronic devices is a persistent challenge due to issues such as electrical isolation failures between conductive layers in storage capacitors, leading to short circuits and manufacturing defects.
Innovation Solution
A light emitting pixel structure incorporating a driving transistor and a storage capacitor with electrically isolated conductive layers, where the first and second conductive layers are patterned with main portions and connection portions to form capacitor portions, allowing for repair of damaged areas during manufacturing to prevent short circuits and ensure stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional storage capacitor structures are used with overlapping conductive layers, then electrical isolation is difficult to maintain, but manufacturing complexity increases and yield decreases
Solution Approach 1:
The conductive layers are divided into multiple isolated conductive regions rather than continuous overlapping layers. Each conductive region is electrically isolated from others, eliminating short circuits while maintaining capacitor functionality. This segmentation approach simplifies the electrical isolation requirement without increasing overall structural complexity.
Solution Approach 2:
The patent transitions from a two-dimensional overlapping conductive layer structure to a three-dimensional stacked structure with insulating layers between conductive regions. By adding the vertical dimension with insulating barriers, electrical isolation is achieved without requiring complex lateral patterning or overlapping arrangements.
2Ease of manufacture
If continuous conductive layers are used for storage capacitors, then manufacturing is simpler, but short circuits occur reducing yield
Solution Approach 1:
Continuous conductive layers are segmented into discrete conductive regions separated by insulating layers. This segmentation prevents short circuits during manufacturing while maintaining relatively simple fabrication processes. The segmented structure allows for better defect tolerance and higher manufacturing yield compared to continuous overlapping layers.
Solution Approach 2:
Insulating layers are introduced as intermediary elements between conductive regions. These intermediary layers prevent direct electrical contact between conductive regions that would otherwise be in close proximity, eliminating short circuit risks while maintaining manufacturing simplicity through standard layer deposition techniques.
3Quantity of substance
If overlapping conductive layers are used in storage capacitors, then capacitor density increases, but electrical isolation failures occur
Solution Approach 1:
The patent achieves high capacitor density by utilizing vertical stacking of conductive regions separated by insulating layers in the third dimension. This approach maintains high storage capacity without requiring lateral overlapping of conductive layers, thereby preventing electrical isolation failures while preserving capacitor density.
Solution Approach 2:
The capacitor structure is segmented into multiple isolated conductive regions stacked vertically with insulating layers. This segmentation provides inherent electrical isolation between conductive regions while maintaining high effective capacitance through the stacked configuration, eliminating isolation failures associated with conventional overlapping structures.
Data Source
AI summary
The disclosure provides an electronic device. The light emitting pixel included in the electronic device includes a light emitting unit, a driving transistor, and a storage capacitor. The driving transistor is configured to control the driving current passing through the light emitting unit. The storage capacitor is electrically connected to the driving transistor and includes a first conductive layer and a second conductive layer. The first conductive layer and the second conductive layer are electrically isolated from each other. The first conductive layer includes a plurality of first main portions connected through at least one first connection portion, and the second conductive layer includes a plurality of second main portions connected through at least one second connection portion. In the top view of the light emitting pixel, one of the first main portions overlaps one of the second main portions.