OLED Retaining Wall Grooves for Organic Film Leveling
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Solution Overview
Problem
Conventional OLED display panels face challenges in maintaining the thickness of organic film layers in non-display areas, leading to thin edges and overflow issues, which affect the encapsulation of particles and moisture blocking.
Innovation Solution
The introduction of first grooves on the retaining wall, arranged in alternating rows, with specific dimensions and shapes, to create capillary channels that improve the leveling effect of the organic film and prevent overflow, ensuring consistent thickness and effective encapsulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a barrier wall is provided in the non-display area to prevent organic film overflow, then overflow is prevented, but the organic film thickness becomes non-uniform and thin edges occur
Solution Approach 1:
The retaining wall is designed with varying heights at different locations. The first retaining wall has a first height in the display area and a second height in the non-display area, where the second height is greater than the first height. This local variation in wall height creates different retention capacities in different regions, allowing the organic liquid to be retained at appropriate thicknesses while preventing overflow in the non-display area.
Solution Approach 2:
The invention introduces a vertical dimension variation by creating retaining walls with different heights at different locations. This transforms the problem from a two-dimensional planar barrier into a three-dimensional structured solution, where the height dimension provides additional control over organic liquid distribution and thickness uniformity.
2Manufacturing precision
If the organic liquid flows slowly from display area to non-display area, then overflow is prevented, but the organic film thickness in non-display area becomes too thin
Solution Approach 1:
The retaining wall structure provides different retention heights in different areas, creating local quality variations that control organic liquid flow and distribution. This ensures appropriate film thickness in both display and non-display areas without requiring uniform slow flow throughout.
3Manufacturing precision
If the organic liquid flows quickly to ensure sufficient thickness in non-display area, then thickness is maintained, but overflow occurs at the barrier wall
Solution Approach 1:
By providing retaining walls with different heights at different locations (first height in display area, second height in non-display area), the structure creates localized retention capacity variations. This allows the organic liquid to achieve sufficient thickness in the non-display area while the higher wall prevents overflow, resolving the contradiction between thickness sufficiency and overflow prevention.
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 grooves on the retaining wall enhance the leveling of the organic film, preventing overflow and ensuring effective particle encapsulation, thereby improving the overall encapsulation performance and extending the service life of OLED display panels.
Implementation Method 1
The introduction of first grooves on the retaining wall, arranged in alternating rows, with specific dimensions and shapes, to create capillary channels that improve the leveling effect of the organic film
Data Source
AI summary
An organic light-emitting diode (OLED) display panel includes a substrate including a display area and a non-display area. At least a retaining wall is disposed on the non-display area and is configured to protrude outward from a surface of the substrate. A plurality of first grooves are provided on the retaining wall. The first grooves are arranged in at least two rows, and the first grooves in adjacent two of the rows are alternately arranged.