OLED Anode Line Spacing for Parasitic Capacitance Reduction
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Solution Overview
Problem
OLED devices face interference issues between data lines and anodes, leading to parasitic capacitance, crosstalk, and uneven luminance, particularly when displaying single colors or long durations of a specific color, which affects the perceived color and stability of sub-pixels.
Innovation Solution
The implementation of a novel OLED device structure where a line is disposed between the data line and the anode to reduce parasitic capacitance and crosstalk, using a planarization layer to isolate and separate lines on different layers, and employing a connection line to connect these lines in a grid pattern to reduce resistance and enhance signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lines and organic light-emitting elements are densely disposed to achieve high resolution, then the number of lines per area increases, but parasitic capacitance and crosstalk increase causing interference and luminance instability
Solution Approach 1:
The patent introduces a third dimension by stacking lines on different layers (first layer and second layer) separated by an insulating layer. This vertical separation reduces parasitic capacitance between adjacent lines while maintaining high horizontal density, thereby achieving high resolution without excessive interference
Solution Approach 2:
An insulating layer is introduced as an intermediary between lines on different layers to prevent direct electrical interaction. This mediator reduces parasitic capacitance and crosstalk while allowing the lines to remain in close proximity for high-resolution display
2Strength
If line width is increased to withstand bending stress, then line strength improves, but the maximum number of lines in a given area decreases reducing resolution
Solution Approach 1:
By distributing lines across multiple vertical layers, the patent achieves high horizontal line density without increasing individual line width. Each layer can contain fewer lines, but the stacked arrangement maintains overall high resolution while allowing each line to be sufficiently strong for bending applications
3Device complexity
If lines are disposed on the same layer to simplify structure, then device complexity decreases, but interference between adjacent lines increases
Solution Approach 1:
The patent transitions from a single-layer horizontal arrangement to a multi-layer vertical arrangement. This dimensional change separates interfering lines in the vertical direction while maintaining compact horizontal footprint, reducing interference without significantly increasing overall device complexity
Solution Approach 2:
The line structure is segmented into multiple independent layers, each containing a subset of the total lines. This segmentation isolates electrical signals on different layers, reducing crosstalk while the modular layer structure keeps fabrication complexity manageable
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively suppresses interference, stabilizes pixel luminance, and reduces bezel width, enabling high-resolution and high-definition displays while preventing cracking or disconnection of lines during bending.
Implementation Method 1
An OLED device utilizes the phenomenon that holes injected from the anode and electrons injected from the cathode recombine in the emitting layer to form excitons, such that light of a particular wavelength is generated as an energy is released when the excitons relax from an excited state to the ground state
Implementation Method 2
parasitic capacitance may be formed between the anode of the organic light-emitting element of a sub-pixel and a data line
Data Source
AI summary
An organic light-emitting display (OLED) device includes a substrate having a display area including a plurality of sub-pixels each comprising an anode, an organic emitting layer and a cathode, a first data line on the substrate and applying a first data voltage to a first sub-pixel emitting light of a first color and to a second sub-pixel emitting light of a second color different from the first color, and a first line disposed between the first data line and an anode overlapping the first data line among the anodes of the plurality of sub-pixels. Parasitic capacitance that may occur between the first data line and the anode overlapping with the first data line can be reduced, and color change in the sub-pixels can be suppressed.