OLED Display Data Line Capacitance Reduction
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Solution Overview
Problem
Conventional organic electroluminescent displays suffer from increased parasitic capacitance due to the narrow gap between power supply lines and data lines, leading to signal loss, distortion, and delay, which deteriorate the emission characteristics.
Innovation Solution
The power supply lines and data lines are separated by a larger gap to reduce parasitic capacitance, with the power supply line overlapping the data lines acting as a pixel electrode or cathode, thereby minimizing the capacitance and load on the data lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If power supply lines and data lines are placed close together to simplify layout, then device complexity is reduced, but parasitic capacitance increases causing signal loss and distortion
Solution Approach 1:
The power supply lines are segmented into first and second power supply line portions positioned at opposite sides of the data lines. This segmentation allows the data lines to be located between the power supply lines, creating a balanced layout that reduces parasitic capacitance while maintaining layout simplicity.
Solution Approach 2:
The patent transitions from a conventional single-sided power supply line arrangement to a three-dimensional spatial configuration where data lines are positioned between two power supply lines in the planar dimension. This dimensional rearrangement optimizes the electromagnetic field distribution and reduces parasitic capacitance between adjacent lines.
2Reliability
If power supply lines are positioned at both sides of data lines to reduce parasitic capacitance, then signal quality improves, but layout complexity increases
Solution Approach 1:
The interlayer insulating layer serves multiple functions: it provides electrical insulation between the data lines and pixel electrodes, and simultaneously acts as a structural platform for positioning the power supply lines at optimal distances. This multi-functionality reduces the need for additional dedicated insulation structures, simplifying the overall layout.
Solution Approach 2:
The patent positions the first and second power supply lines at symmetric distances from the data lines, creating an equipotential-like electromagnetic environment. This symmetric arrangement balances the electric fields and minimizes parasitic capacitance effects, improving signal quality while maintaining layout regularity.
3Object-generated harmful factors
If the gap between power supply lines and data lines is increased to reduce parasitic capacitance, then signal loss decreases, but manufacturing precision requirements increase
Solution Approach 1:
The interlayer insulating layer is formed beforehand to establish a predefined insulation structure and reference plane. Subsequent positioning of power supply lines and data lines is performed relative to this pre-formed layer, which standardizes the gap dimensions and reduces variability in manufacturing processes.
Solution Approach 2:
The interlayer insulating layer acts as an intermediary structure between the data lines and pixel electrodes, and also serves as a reference medium for positioning power supply lines. This intermediary layer standardizes the spacing relationships, making the gap dimensions more controllable and less sensitive to manufacturing variations.
Data Source
AI summary
An organic electroluminescent display in which a power supply line for a power supply voltage is separated from data lines for data signals in a signal input portion is disclosed. The power supply line over the data lines is employed as a pixel electrode or a cathode to supply the power supply voltage. This arrangement decreases the parasitic capacitance between the two lines and reduces load on the data lines.