Organic Light-Emitting Substrate Common Voltage Subsidiary Line
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The high resistance of the common electrode in organic light-emitting display apparatuses leads to image defects such as spots due to varying voltage distribution across the electrode, affecting display quality.
Innovation Solution
Incorporating a common voltage subsidiary line with lower resistance, formed on the same layer as the pixel electrode but spaced apart, which encloses the outline of unit blocks and is electrically connected to the common electrode, to stabilize the common voltage and improve display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the common electrode is made thin to retain transparency, then transparency is improved, but resistance increases
Solution Approach 1:
The patent introduces a common voltage subsidiary line as a separate conductive element that works together with the common electrode to form a combined voltage supply system. This segmentation allows the common electrode to remain thin and transparent while the subsidiary line provides additional conductivity pathways to compensate for the increased resistance.
Solution Approach 2:
The common voltage subsidiary line acts as an intermediary element that mediates between the voltage source and the common electrode. It provides an alternative current path that reduces the overall resistance of the voltage supply system, thereby compensating for the high resistance caused by the thin common electrode.
2Illumination intensity
If the common electrode has high resistance, then transparency is improved, but voltage distribution becomes unstable causing image defects
Solution Approach 1:
By dividing the voltage supply function between the common electrode and the common voltage subsidiary line, the patent creates multiple voltage distribution pathways. This segmentation ensures that voltage is supplied more uniformly across the display area, preventing the voltage drops and instability that cause image defects.
Solution Approach 2:
The common voltage subsidiary line is designed to work in conjunction with the common electrode to create a more uniform voltage distribution across the display area. By providing additional conductivity pathways, the system achieves better equipotential conditions, reducing voltage variations that lead to spots and image defects.
3Reliability
If a common voltage subsidiary line is added to stabilize voltage, then display quality is improved, but device complexity increases
Solution Approach 1:
The common voltage subsidiary line is formed on the same layer as the pixel electrode, and both are patterned together in a single photolithography process. This merging of formation processes reduces manufacturing complexity despite the additional functional element.
Solution Approach 2:
The common voltage subsidiary line serves multiple functions: it provides additional conductivity pathways, stabilizes voltage distribution, and can be integrated with existing pixel electrode patterns. This multi-functionality justifies the added structural element by providing multiple benefits from a single addition.
Data Source
AI summary
An organic light-emitting substrate includes; a base substrate including a display area and a peripheral area formed around the display area, an organic light-emitting diode including a pixel electrode, a common electrode and an organic light-emitting part, the pixel electrode being formed in a unit pixel of the display area, the common electrode being formed over the display area, and the organic light-emitting part being disposed between the pixel electrode and the common electrode, a driving circuit part which applies driving current to the pixel electrode and is electrically connected to the pixel electrode, and a common voltage subsidiary line formed on substantially the same layer as the pixel electrode, spaced apart from the pixel electrode, disposed under the common electrode, and electrically connected to the common electrode.