Organic Planarization Layers for Display Device Short-Circuit Prevention
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Solution Overview
Problem
Display devices face reliability issues due to surface level differences between conductive layers, leading to potential short-circuits and coupling, which are not adequately addressed by existing technologies.
Innovation Solution
A display device design incorporating a first organic planarization layer and a second organic planarization layer with different heights, formed via a single mask process, to compensate for surface level differences and prevent short-circuits between electrodes and conductive layers, with the second organic planarization layer acting as an organic film interposed between the electrodes and the third conductive layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single mask process is used to form organic layers, then manufacturing efficiency is improved, but surface level differences between conductive layers may cause short-circuits
Solution Approach 1:
The organic planarization layer is divided into multiple segments with different heights (first organic planarization layer and second organic planarization layer). Each segment is positioned at different elevations to match the underlying conductive layers, preventing short-circuits while maintaining a single mask process for formation.
Solution Approach 2:
Different regions of the organic planarization layer are given different local heights to compensate for the varying levels of underlying conductive layers. The first organic planarization layer has a first height and the second organic planarization layer has a second height, creating locally adapted surfaces that prevent electrical shorting between adjacent conductive layers.
2Reliability
If multiple organic planarization layers with different heights are formed, then surface level differences are compensated and short-circuits are prevented, but device structure becomes more complex
Solution Approach 1:
The first organic planarization layer and second organic planarization layer are formed in a single mask process, merging two separate formation steps into one. This reduces process complexity and aligns well with the single mask process requirement, while still achieving the multi-level surface structure needed to prevent short-circuits.
Data Source
AI summary
A display device includes: a substrate; a first conductive layer on the substrate and including a conductive pattern electrically connected to a first transistor; a first organic planarization layer on the first conductive layer; an organic layer on the first organic planarization layer and including a first bank having a first height and a second organic planarization layer having a second height lower than the first height; a first electrode on the organic layer; a second electrode on the organic layer and spaced apart from the first electrode; and a light-emitting element between the first electrode and the second electrode. The first organic planarization layer has a first opening exposing the conductive pattern, and the second organic planarization layer has a second opening exposing the conductive pattern. Sidewalls of the first opening and sidewalls of the second opening are not aligned in line with each other.