OLED Data Line Coupling Reduction via Layered Insulation
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Solution Overview
Problem
In organic light emitting display devices, coupling between adjacent data lines can lead to interference of data signals, resulting in pixels not emitting light with desired brightness.
Innovation Solution
The device includes a substrate with two pixel columns, first and second data lines, a driving voltage line, and insulating layers, where the data lines are formed on different layers to minimize coupling, and a switching unit with a demultiplexer circuit to selectively supply data signals, ensuring proper light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If data lines are arranged adjacent to each other to supply data signals to different pixels, then the display coverage is improved, but coupling is generated between data lines causing signal interference
Solution Approach 1:
The patent applies dimensionality change by forming data lines on different layers (first data line on first insulating layer, second data line on second insulating layer) rather than adjacent positions in the same plane. This vertical stacking approach reduces electromagnetic coupling between data lines while maintaining comprehensive display coverage across the pixel array.
Solution Approach 2:
The patent introduces insulating layers as intermediary structures between data lines. The first insulating layer and second insulating layer act as dielectric barriers that electrically isolate adjacent data lines, preventing signal coupling and interference while allowing the data lines to be positioned close together for efficient signal distribution.
2Device complexity
If data lines are placed close together to reduce the number of data lines, then device complexity is reduced, but coupling generates interference preventing pixels from emitting light with desired brightness
Solution Approach 1:
The patent reduces device complexity by implementing a compact data line routing scheme where first and second data lines are positioned on different layers and extend in opposite directions. This vertical arrangement allows more pixels to be addressed with fewer physical data lines while the layer separation maintains signal integrity for precise brightness control.
Solution Approach 2:
Insulating layers serve as intermediary structures that electrically isolate data lines running in opposite directions. This isolation prevents cross-talk and signal interference, ensuring that each data line can independently control pixel brightness with the required precision despite the reduced number of lines.
3Area of stationary object
If data lines extend in opposite directions to cover more pixels, then display area is increased, but coupling between data lines increases causing signal interference
Solution Approach 1:
The patent increases display area by having first and second data lines extend in opposite directions from a common region, with each line positioned on a different layer. This vertical stacking with bidirectional extension allows comprehensive coverage of the pixel array while the layer separation minimizes electromagnetic coupling between the oppositely directed lines.
Solution Approach 2:
The first and second insulating layers act as intermediary dielectric structures that electrically isolate the first data line from the second data line. This isolation prevents signal interference between lines extending in opposite directions, enabling large display area coverage without compromising signal integrity.
Data Source
AI summary
There is provided an organic light emitting display device. The organic light emitting display device includes a two pixel columns arranged on the substrate to be adjacent to each other, a first data line and a second data line that are provided between the two pixel columns, at least one scan line that intersects the first and second data lines, and first and second insulating layers sequentially laminated on the substrate. Pixels included in the two pixel columns are connected to one of the first data line and the second data line and the scan line. The first data line is formed between the first insulating layer and the second insulating layer. Therefore, coupling generated between adjacent data lines is reduced so that picture quality of the organic light emitting display device is improved.