Subpixel Blocking Structure for Defect Isolation in OLED Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In light emitting display apparatuses, progressive defects such as black spots in the light emitting device layer can diffuse to adjacent subpixels, reducing emission efficiency and requiring high power consumption.
Innovation Solution
A blocking structure with a groove and reflection layer is provided between subpixels to prevent the diffusion of defects and improve emission efficiency while reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If emission layers are connected to cover banks for continuous coverage, then manufacturing simplicity is improved, but defect diffusion to adjacent subpixels occurs reducing reliability
Solution Approach 1:
The emission layer is segmented into discrete regions for each subpixel, separated by gaps positioned over the banks. This segmentation prevents defect diffusion between subpixels while maintaining manufacturing feasibility through patterned deposition processes.
Solution Approach 2:
The emission layer exhibits different properties in different locations: continuous coverage within each subpixel emission region for optimal light emission, and discontinuous gaps over the banks for defect isolation. This local quality variation resolves the contradiction between manufacturing simplicity and reliability.
2Strength
If banks are covered by emission layers for structural integrity, then mechanical strength is improved, but water penetration between subpixels occurs reducing reliability
Solution Approach 1:
The solution moves from a two-dimensional continuous layer to a three-dimensional structure where emission layers are positioned only in emission regions above banks, with gaps allowing vertical isolation. This dimensional change enables both structural support and water blocking functionality.
Solution Approach 2:
The bank structure itself serves as an intermediary element that provides both mechanical support and water barrier functionality. The emission layers are positioned to utilize the bank structure for support while gaps between emission regions over the banks provide water blocking.
3Illumination intensity
If light is allowed to escape in all directions for brightness, then illumination intensity is improved, but light loss increases reducing energy efficiency
Solution Approach 1:
The bank structures, which could be considered obstacles to light, are utilized as reflective surfaces to redirect light that would otherwise be lost. This converts the potential harm of light blockage into a beneficial reflection mechanism that improves overall light extraction efficiency.
Solution Approach 2:
The bank structures serve multiple functions simultaneously: providing mechanical support, enabling water blocking through gap positioning, and acting as reflective surfaces to improve light extraction. This multi-functionality resolves the contradiction between brightness and energy efficiency.
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 blocking structure effectively prevents defect diffusion, enhancing emission efficiency and lowering power consumption by reflecting light and blocking water/oxygen penetration.
Implementation Method 1
a blocking structure provided between the plurality of subpixels to reflect light incident from an emission region
Implementation Method 2
prevent penetration of water between the plurality of subpixels
Data Source
AI summary
A light emitting display apparatus includes a substrate including a display area and a non-display area at a periphery of the display area, a plurality of subpixels provided in the display area, and a blocking structure provided between the plurality of subpixels to reflect light incident from an emission region of the display area and prevent penetration of water between the plurality of subpixels.