OLED Data Line Shielding via Intermediary Ground Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In organic light emitting display devices, capacitive coupling between adjacent data lines can occur, leading to interference and reduced brightness of pixels.
Innovation Solution
The design includes a substrate with pixel columns, data lines, a power source line, scan line, switching transistor, driving transistor, and a storage capacitor with overlapping plates, along with specific insulating layers and protrusions to prevent capacitive coupling between data lines, ensuring stable signal transmission and desired brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If data lines are placed adjacent to each other to reduce device area, then area efficiency is improved, but capacitive coupling between data lines increases causing signal interference
Solution Approach 1:
The patent introduces a ground line positioned between adjacent data lines as an intermediary element. This ground line acts as a shield that reduces capacitive coupling between the data lines by providing a reference potential that prevents charge accumulation and signal interference, thereby maintaining signal integrity while allowing compact data line spacing
Solution Approach 2:
The patent utilizes the vertical dimension by positioning the ground line at a different height level between the data lines in the column direction. This three-dimensional arrangement allows the ground line to effectively shield the data lines from capacitive coupling without increasing the planar footprint of the device
2Area of stationary object
If storage capacitor plates are positioned to overlap data lines for compact layout, then area efficiency is improved, but capacitive coupling and signal interference increase
Solution Approach 1:
The patent positions the ground line between the storage capacitor plates and the data lines, creating an intermediary shielding layer. This ground line blocks the capacitive coupling path between the capacitor plates and data lines, allowing the capacitor plates to be positioned close to the data lines for compact layout while maintaining signal stability
Solution Approach 2:
The patent arranges the storage capacitor plates and ground line in vertical layers, utilizing the thickness direction for spatial separation. The ground line is positioned at an intermediate height between the capacitor plates and data lines, effectively shielding the data lines from capacitive interference while maintaining compact planar dimensions
3Productivity
If data lines are positioned close together to increase pixel density, then display resolution is improved, but capacitive coupling causes brightness reduction
Solution Approach 1:
The ground line serves as a shielding intermediary between adjacent data lines, preventing capacitive coupling that would otherwise cause signal interference and reduce pixel brightness. This allows data lines to be positioned close together for high pixel density while maintaining adequate signal levels for desired brightness
Solution Approach 2:
The patent employs vertical layering to position the ground line at an intermediate height between data lines, creating effective electromagnetic shielding in the third dimension. This enables increased pixel density through closer data line spacing without compromising pixel brightness, as the ground line shield prevents signal degradation
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 configuration effectively reduces capacitive coupling between adjacent data lines, allowing pixels to receive data signals stably and emit light with desired brightness, enhancing the display performance.
Implementation Method 1
a storage capacitor including a first storage capacitor plate and a second storage capacitor plate overlapping the first storage capacitor plate in a thickness direction
Implementation Method 2
a data insulating layer between the interlayer insulating layer and one of the data lines
Data Source
AI summary
An organic light emitting display device includes a substrate on which is included pixel columns extending in a column direction and adjacent to each other in a row direction, data lines extending in the column direction and adjacent to each other and between the pixel columns in the row direction, a power source line extending in the column direction, a scan line extending in the row direction, a switching transistor connected to the scan line and one of the data lines, a driving transistor connected to the switching transistor, an OLED connected to the driving transistor, and a storage capacitor including a first storage capacitor plate and a second storage capacitor plate overlapping the first storage capacitor plate in a thickness direction, connected to the power source line, and having a portion extending in the column direction between and not overlapping the data lines in the thickness direction.