OLED Display Conductive Pattern Reduces Parasitic Capacitance
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Solution Overview
Problem
High parasitic capacitance between conductive lines in OLED displays affects display quality, particularly causing undesirable horizontal stripes during image rendering, especially when using AMOLED impulsive driving dimming methods.
Innovation Solution
Incorporating a conductive pattern that overlaps at least 50% of the source node area, reducing parasitic capacitance between data lines and active pattern regions, thereby improving image quality by minimizing horizontal stripes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive lines are used to connect OLED pixels, then electrical connection is achieved, but parasitic capacitance is generated between the lines
Solution Approach 1:
A conductive pattern is introduced as an intermediary element between the data line and the active pattern. This conductive pattern, when overlapping the source node region, creates a shielding effect that reduces the parasitic capacitance between the data line and the active pattern, while still allowing proper electrical connection through the transistor gate.
2Manufacturing precision
If resolution is increased, then display quality improves, but parasitic capacitance between conductive lines increases
Solution Approach 1:
The conductive pattern is strategically positioned to overlap specifically with the source node region of the active pattern. This localized placement creates a shielding effect precisely where the parasitic capacitance is most problematic, without affecting other regions of the pixel. The local quality improvement addresses the parasitic capacitance issue in the critical area while maintaining high display resolution.
3Device complexity
If conventional conductive line layout is used, then device complexity is reduced, but horizontal stripes appear in display
Solution Approach 1:
The conductive pattern serves as a mediator that shields the active pattern from the data line's electric field. By overlapping the source node region, it prevents the formation of horizontal stripes that would otherwise appear due to parasitic capacitance effects, while adding minimal complexity to the overall device structure.
Data Source
AI summary
An organic light-emitting diode (OLED) display includes a data line disposed on a substrate and extended in a first direction, a power line disposed on the substrate and extended in the first direction, a scan signal line disposed on the substrate across the data line, an active layer formed over the substrate, wherein the active layer includes first to fourth regions, wherein the first and fourth regions are connected to each other through a connecting region, a first transistor including the active layer formed between the first region and the second region, a second transistor including the active layer formed between the third region and the fourth region, and wherein the active layer is extended from the first region, the organic light emitting diode is electrically coupled to the first transistor, and a storage capacitor including a first electrode and a second electrode formed over the first electrode.