OLED Pixel Electrode Insulating Layer Prevents Contact Hole Short-Circuits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The design limit requirements for circuit configuration within a limited space in high-resolution organic light-emitting displays lead to structural weak spots and short-circuits between electrodes, causing failures in forming capacitors.
Innovation Solution
The implementation of a layered structure with a fourth insulating layer made of organic material that fully covers the contact hole and stepped portions, preventing short-circuits by ensuring the pixel electrode is spaced apart from the contact hole and covering the seams between insulating layers, thereby maintaining capacitor formation and improving driving capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel size is reduced to achieve higher resolution displays, then the display resolution is improved, but the capacitor formation fails due to short-circuits between electrodes
Solution Approach 1:
The patent introduces a fourth insulating layer to create an additional dimensional barrier between the pixel electrode and contact hole. This extra layer provides vertical spacing and planarization, preventing short-circuits in the reduced pixel size environment of high-resolution displays while maintaining capacitor formation reliability
Solution Approach 2:
The fourth insulating layer acts as an intermediary element between the pixel electrode and the underlying contact hole structure. It provides both electrical isolation and mechanical planarization, serving as a mediator that prevents direct contact between conductive elements while allowing the capacitor to function properly
2Area of stationary object
If the circuit configuration is densified to fit within limited subpixel space, then the space utilization is improved, but short-circuits occur between electrodes
Solution Approach 1:
By adding the fourth insulating layer, the patent creates additional vertical separation between closely spaced circuit elements. This dimensional approach allows denser horizontal routing while maintaining adequate electrical isolation, enabling better space utilization without causing short-circuits
Solution Approach 2:
The fourth insulating layer is positioned in advance to cover and planarize the contact hole area before the pixel electrode is formed. This pre-cushioning approach prevents potential short-circuits before they can occur, allowing for safer and denser circuit configuration
Data Source
AI summary
Organic light-emitting display is disclosed. The organic light-emitting display includes a first substrate, a semiconductor layer positioned on the first substrate, a first insulating layer positioned on the semiconductor layer, a gate metal layer positioned on the first insulating layer, a second insulating layer with a contact hole exposing part of the gate metal layer, a source-drain metal layer positioned on the second insulating layer and electrically connected to the gate metal layer via the contact hole, a third insulating layer positioned on the source-drain metal layer, a fourth insulating layer positioned on the third insulating layer, and a pixel electrode positioned on the fourth insulating layer, wherein the fourth insulating layer fully covers the contact hole, and a stepped portion of the pixel electrode caused by the fourth insulating layer is spaced apart from the contact hole.