Display Device Organic-Layer Openings for Capillary Infiltration
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Solution Overview
Problem
There is a demand for display devices with improved display quality, specifically those that are low power and high efficiency, while also having a reduced defect rate.
Innovation Solution
The display device includes a display panel with an emission region and a peripheral region, featuring an organic layer with openings defined by vertices of specific angles and shapes, a planarization layer that fills these openings, and a light blocking pattern, along with a refractive index greater than the organic layer, and incorporates a conductive mesh line for input sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional opening shape (e.g., rectangular or circular) is used in the organic layer, then the manufacturing process is simple, but display defects occur due to poor fluid composition infiltration
Solution Approach 1:
The opening is designed with an asymmetric shape featuring first vertices with internal angles of 90° or less that extend outward from the emission region. This asymmetric configuration creates capillary pressure differences that actively guide fluid composition infiltration, resolving the contradiction by using geometric asymmetry to improve reliability without significantly complicating manufacturing.
Solution Approach 2:
The internal angles at the first vertices are specifically controlled to be 90° or less, creating a parameter change in the opening geometry. This angular parameter modification generates the necessary capillary pressure to drive fluid infiltration, thereby improving display quality while maintaining a relatively simple manufacturing process.
2Reliability
If the opening extends far from the emission region, then fluid composition infiltration is improved, but light leakage increases
Solution Approach 1:
The opening exhibits local quality variation where the first vertices extend outward to enhance fluid infiltration at specific locations, while the overall opening area is controlled to minimize light leakage. This localized geometric modification achieves the desired fluid infiltration without proportionally increasing the total opening area that would cause harmful light leakage.
Solution Approach 2:
The vertices with internal angles of 90° or less, which initially might seem to increase opening area and potential light leakage, actually serve to generate capillary pressure that draws fluid composition inward. The outward extension of vertices is converted into a beneficial force for fluid infiltration while the overall opening dimensions are managed to prevent excessive light leakage.
3Stability of the object's composition
If the internal angle at vertices is increased, then structural stability is improved, but capillary pressure for fluid infiltration decreases
Solution Approach 1:
The internal angles at the first vertices are specifically set to 90° or less, creating a parameter change that optimizes capillary pressure for fluid infiltration. This angular parameter is carefully controlled to achieve the right balance between structural stability and fluid infiltration performance.
Solution Approach 2:
The opening design uses asymmetric vertex angles (90° or less) rather than uniform angles, creating local asymmetric regions that generate capillary pressure for fluid infiltration while the overall structure maintains stability through the symmetric arrangement of these asymmetric vertices around the emission region.
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 enhances display quality by reducing defects and optimizing power efficiency, ensuring effective light management and input detection.
Implementation Method 1
a planarization layer on the organic layer, and filling the opening
Data Source
AI summary
A display device includes: a display panel including an emission region, and a peripheral region adjacent to the emission region, the emission region including a light emitting element; at least one insulating layer on the display panel; an organic layer on the at least one insulating layer, the organic layer having an opening corresponding to the emission region; and a planarization layer on the organic layer, and filling the opening. The opening has a shape including first vertices and second vertices in a plan view, each of the first vertices has an internal angle of 90° or less, and in the plan view, each of the first vertices is located farther from a center of the opening than a corresponding adjacent second vertex from among the second vertices.