Blue OLED Display with Auxiliary Electrodes for IR Drop Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In display devices, limited space for capacitors affects brightness uniformity, and the use of transparent conductive materials in organic light emitting diodes (OLEDs) leads to voltage distribution issues and IR drop, with potential interference between capacitors and auxiliary electrodes.
Innovation Solution
A display device configuration including a substrate, a thin film transistor, a storage capacitor, a blue organic light emitting diode, and auxiliary electrodes, where the storage capacitor is designed to minimize interference with the thin film transistor and the auxiliary electrodes are positioned to reduce IR drop, using a specific layer structure and materials to enhance voltage distribution and brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the space for capacitor is limited, then the device area is reduced, but the brightness uniformity is affected
Solution Approach 1:
The patent positions the storage capacitor in the non-display area (peripheral region) rather than within the display area, utilizing spatial dimensionality change to resolve the conflict between device area and brightness uniformity. This allows the capacitor to be placed without occupying display pixel space while maintaining adequate capacitance value for stable voltage supply.
Solution Approach 2:
The patent implements different structural configurations in different regions: the display area uses transparent conductive materials for OLED electrodes to maintain optical quality, while the non-display area accommodates the capacitor with optimized electrode positioning. This local differentiation allows each region to be optimized for its specific function without compromising the other.
2Device complexity
If transparent conductive material is used in OLED cathode, then the device structure is simplified, but voltage distribution is affected causing IR drop
Solution Approach 1:
The patent introduces an auxiliary electrode as an intermediary element between the transparent conductive cathode and the power supply. This auxiliary electrode acts as a voltage compensation mechanism that mitigates the IR drop caused by the high impedance of transparent conductive materials, while maintaining the structural simplicity of using transparent conductors in the OLED stack.
Solution Approach 2:
The patent modifies the electrical parameters of the cathode region by adding auxiliary electrodes with specific impedance characteristics. This changes the overall voltage distribution profile, compensating for the inherent high impedance of transparent conductive materials and reducing IR drop without requiring a complete structural redesign.
3Reliability
If auxiliary electrodes are added to reduce IR drop, then voltage distribution is improved, but interference with capacitor occurs
Solution Approach 1:
The patent spatially segments the device into distinct functional zones: the display area with OLED pixels, the capacitor region in the non-display area, and auxiliary electrode positions strategically located to avoid overlapping with capacitor structures. This segmentation prevents electrical and electromagnetic interference between the capacitor and auxiliary electrodes while maintaining their respective functions.
Solution Approach 2:
The patent designs the auxiliary electrode configuration to create equipotential regions that minimize electric field interference with the capacitor. By positioning auxiliary electrodes to establish uniform voltage distribution without creating strong electric field gradients near the capacitor, interference is reduced while maintaining voltage compensation benefits.
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
The solution improves brightness uniformity and reduces IR drop, effectively addressing the interference issues between capacitors and auxiliary electrodes, resulting in enhanced display performance.
Implementation Method 1
A blue organic light emitting diode includes an anode, a cathode, and a blue organic light emitting layer disposed therebetween. The blue organic light emitting layer is electrically connected with the anode and the cathode.
Implementation Method 2
A wavelength conversion element is disposed on the first sealing layer.
Data Source
AI summary
A display device includes a first inorganic layer disposed on a substrate; a thin film transistor disposed on the first inorganic layer and including a metal oxide semiconductor, a gate electrode overlapping the metal oxide semiconductor, a source electrode and a drain electrode electrically connected with the metal oxide semiconductor; a storage capacitor including a first electrode and a second electrode electrically insulated from and overlapped with the first electrode, and the first electrode is electrically connected with the gate electrode and the second electrode is electrically connected with the source electrode; a first organic layer disposed on the thin film transistor and including a contact via; a blue organic light emitting diode including an anode, a cathode and a blue organic light emitting layer disposed therebetween, and electrically connected with the cathode and the anode which is electrically connected with the source electrode through the contact via.