OLED Display Panel Blocking Wall Structure for Edge Wiring Exposure
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Solution Overview
Problem
In OLED display panels, the slope of the organic layer at the edges created during inkjet printing leads to inaccurate exposure and focus issues for edge wirings, resulting in a risk of short circuits due to the thinness of the encapsulation layer at these edges.
Innovation Solution
The introduction of a second-layer blocking wall and a first-layer blocking wall, with a blocking block between them, increases the height and thickness of the blocking wall, smoothing the slope during inkjet printing and ensuring a flat encapsulation layer, thereby reducing the height difference of wirings at the edges and preventing inaccurate exposure and focus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a blocking wall is provided to prevent organic matter overflow during inkjet printing, then the organic matter is contained within the display area, but the organic layer develops a slope at the edges causing wiring exposure and focus problems
Solution Approach 1:
The patent introduces a multi-level blocking wall structure with different heights (first blocking wall, second blocking wall, and third blocking wall at progressively higher levels). This vertical dimensionality change creates a stepped configuration that prevents organic matter overflow while maintaining a flat printing surface at each level, thereby eliminating the edge slope problem that causes wiring exposure inaccuracies.
Solution Approach 2:
The blocking wall is segmented into multiple distinct components: a first blocking wall, a second blocking wall, and a third blocking wall, each serving specific functions. The segmentation allows the structure to simultaneously provide overflow prevention at the base level and create flat printing surfaces at elevated levels, resolving the contradiction between containment and precision.
2Manufacturing precision
If the blocking wall height is increased to flatten the encapsulation layer, then the wiring exposure accuracy improves, but the device structure becomes more complex
Solution Approach 1:
Rather than creating one extremely tall blocking wall, the structure is segmented into three separate blocking walls of progressively increasing heights. This segmentation distributes the height increase across multiple components, making the overall structure more manageable and easier to manufacture while achieving the same goal of flattening the encapsulation layer for accurate wiring exposure.
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 results in a more accurate and reliable exposure process, reducing the risk of short circuits and ensuring a flat encapsulation layer, which enhances the manufacturing precision and reliability of OLED display panels.
Implementation Method 1
Liquid organic matter is printed on the panel, then cured by ultraviolet light
Data Source
AI summary
A display panel and a display device are provided and have a base substrate, a blocking wall, an encapsulation layer, and a touch capacitor layer. By forming a second-layer blocking wall and a first-layer blocking wall to form a second blocking wall, a height of the second blocking wall is increased. Further, a blocking block is disposed between the second blocking wall and the first blocking wall, thereby increasing a thickness and a height of the blocking wall. When inkjet printing an organic layer, a slope at edges of a display area is relatively smooth, which can make an entire encapsulation layer relatively flat, thereby reducing a height difference of wirings at the edges and avoiding a problem of inaccurate exposure and focus.