Light-Emitting Device Parasitic Capacity Reduction via Planar Separation
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Solution Overview
Problem
In active matrix light-emitting devices, parasitic capacity between components hinders high-precision control of light-emitting elements due to overlapping electrodes and capacitive coupling, affecting emission time and quality.
Innovation Solution
The light-emitting device configuration includes a drive transistor, a capacitor element, and an electrical continuity portion disposed on the side opposite to the capacitor element with the drive transistor in between, reducing parasitic capacity by using a different layer for the electrical continuity portion and optimizing the placement of components to minimize capacitive coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If components are closely disposed to decrease the area of each light-emitting element, then miniaturization and higher-definition are achieved, but parasitic capacity increases due to overlapping electrodes and capacitive coupling
Solution Approach 1:
The patent applies dimensional separation by disposing the electrical continuity portion and capacitor element in different planar regions (opposite sides of the drive transistor) rather than allowing them to overlap in the same space. This spatial separation in two dimensions eliminates parasitic capacity while maintaining miniaturization, as components are packed efficiently without capacitive coupling between adjacent overlapping structures.
2Ease of operation
If source metal and capacitor electrode are disposed adjacent to each other with insulating layer therebetween, then circuit connectivity is achieved, but capacity parasitism occurs between the components
Solution Approach 1:
The patent extracts the electrical continuity portion from the overlapping region with the capacitor element, placing it in a separate planar region. This separation removes the source of parasitic capacity (the close proximity and overlapping of conductive elements) while preserving the essential circuit connectivity function through the insulating layer, as the electrical continuity portion remains electrically connected to the drive transistor source.
3Area of stationary object
If electrical continuity portion is disposed between drive transistor and capacitor element, then compact layout is achieved, but parasitic capacity increases affecting potential control precision
Solution Approach 1:
The patent uses planar separation to position the electrical continuity portion in a different two-dimensional region (opposite side of the drive transistor) rather than embedding it between the transistor and capacitor element. This dimensional rearrangement eliminates parasitic capacity that would affect potential control, while the overall layout remains compact because all components are still contained within the same pixel region without extending vertically or to additional layers.
Data Source
AI summary
A light-emitting device includes a drive transistor for controlling the quantity of current supplied to a light-emitting element, a capacitor element electrically connected to a gate electrode of the drive transistor, and an electrical continuity portion for electrically connecting the drive transistor and the light-emitting element, these elements being disposed on a substrate. The electrical continuity portion is disposed on the side opposite to the capacitor element with the drive transistor disposed therebetween.