Display Device Scan Write Line Parasitic Capacitance Reduction
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Solution Overview
Problem
The existing display devices suffer from image quality deterioration due to parasitic capacitance between the gate electrode of the driving transistor and the scan line, leading to non-uniform luminance among pixels.
Innovation Solution
The display device incorporates a scan write line and specific connection electrodes to prevent overlapping, thereby eliminating parasitic capacitance and ensuring uniform luminance across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the scan line is positioned close to the gate electrode of the driving transistor for compact layout, then the device area is reduced, but parasitic capacitance increases causing image quality deterioration
Solution Approach 1:
The patent extracts the harmful overlapping region between the scan line and gate electrode by introducing connection electrodes that route the scan signal away from the gate electrode area. The scan line is connected to the gate electrode through intermediate connection electrodes positioned in different layers, eliminating direct overlap and thus removing the parasitic capacitance source while maintaining electrical connectivity.
Solution Approach 2:
The patent resolves the spatial conflict by utilizing multiple fabrication layers. The scan line, connection electrodes, and gate electrode are positioned in different vertical layers (first interlayer insulating layer, second interlayer insulating layer, etc.), allowing compact horizontal layout without creating harmful overlaps in the vertical dimension.
2Reliability
If connection electrodes are added to prevent parasitic capacitance, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent merges the connection electrode function into the existing interlayer insulating layer structure. The connection electrodes are formed as part of the standard thin-film transistor fabrication process, utilizing the same material deposition and patterning steps as other conductive elements, thus adding minimal process complexity.
Solution Approach 2:
The connection electrodes serve as intermediary elements that mediate between the scan line and gate electrode. These intermediaries are positioned in intermediate layers and provide electrical connection without creating parasitic capacitance, effectively decoupling the harmful interaction while maintaining signal transmission.
Data Source
AI summary
A display device comprising a scan write line to which a scan write signal is applied, a data line to which a data voltage is applied, and a pixel electrically connected to the scan write line and the data line. The pixel comprises a light emitting element, a driving transistor that provides a driving current to the light emitting element according to a voltage of a gate electrode, a first transistor that supplies a data voltage of the data line to a first electrode of the driving transistor according to the scan write signal of the scan write line, a first connection electrode electrically connected to a gate electrode of the driving transistor, a first gate connection electrode electrically connected to a gate electrode of the first transistor, and a second connection electrode that electrically connects the scan write line to the first gate connection electrode.