AMOLED Organic Common Layer Leakage Current Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
AMOLED display panels experience a strong leakage current between illuminating and non-illuminating pixel regions, leading to decreased image quality due to electron and hole transfer between adjacent pixels.
Innovation Solution
A display panel design featuring a substrate with a pixel definition layer and an organic common layer, where recesses are formed in the pixel definition layer between adjacent pixel regions, increasing the resistance of the organic common layer and reducing leakage current by altering the thickness and coverage of the organic common layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the organic common layer is formed with uniform thickness across pixel regions and pixel definition layers, then the manufacturing process is simple, but leakage current occurs between adjacent pixel regions causing image quality degradation
Solution Approach 1:
The organic common layer is designed with different thicknesses in different regions: a first thickness over the pixel definition layer and a second thickness over the pixel region, where the first thickness is less than the second thickness. This local differentiation increases resistance between adjacent pixel regions, reducing leakage current and improving image quality while maintaining manufacturing feasibility through selective deposition control.
2Reliability
If recesses are formed in the pixel definition layer between adjacent pixel regions, then leakage current is reduced by increasing resistance, but the manufacturing process becomes more complex
Solution Approach 1:
Recesses are formed in the pixel definition layer before depositing the organic common layer. This preliminary structuring creates physical separation between adjacent pixel regions, and when the organic common layer is deposited, it conforms to the recessed structure, automatically creating the desired thickness variation that increases resistance and reduces leakage current without requiring additional processing steps later.
3Reliability
If the organic common layer thickness is reduced over the pixel definition layer, then resistance between pixel regions increases reducing leakage current, but the layer becomes more difficult to deposit uniformly
Solution Approach 1:
Instead of attempting to deposit a uniformly thin layer across the entire substrate, the solution creates a three-dimensional structure by forming recesses in the pixel definition layer. The organic common layer is then deposited to a uniform thickness relative to the substrate plane, but due to the recesses, this results in different effective thicknesses in different regions (thinner over recesses, thicker over pixel regions), achieving the desired resistance variation through geometric rather than depositional control.
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 increased resistance of the organic common layer between pixel regions effectively reduces or eliminates leakage current, maintaining non-illuminating pixels in a dark state and enhancing image quality by preventing unwanted illumination.
Implementation Method 1
the resistance of the organic common layer between the pixel regions can be increased, and thus the leakage current generated between the illuminating pixel region and the non-illuminating pixel region can be reduced or even restrained
Data Source
AI summary
The present disclosure discloses a display panel, a display device and a manufacturing method of a display panel. The display panel includes: a substrate; a pixel definition layer disposed on the substrate, with a plurality of pixel regions being defined in the pixel definition layer; and an organic common layer disposed on the pixel regions and the pixel definition layer; wherein, a thickness of at least one portion of the organic common layer corresponding to the pixel definition layer is less than that of at least one portion of the organic common layer corresponding to the pixel region; or at least one recess is disposed in a portion of the pixel definition layer between adjacent pixel regions or in every pixel definition layer between two adjacent pixel regions, and the organic common layer covers the recess.