Flat Panel Display Gate Insulating Layer Pixel Definition
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Solution Overview
Problem
The fabrication of flexible organic electroluminescence (EL) display apparatuses is complex due to the need for low-temperature processing and the use of organic thin film transistors (OTFTs), which require intricate processes for forming gate insulating layers and pixel separation layers.
Innovation Solution
A flat panel display apparatus with a gate insulating layer acting as a pixel separation layer, formed using laser ablation, ink-jet, or laser-induced thermal imaging methods, simplifying the fabrication process by eliminating the need for via hole formation and photolithography.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fabrication methods are used to form gate insulating layer and pixel separation layer separately, then the display apparatus can be manufactured, but the fabrication process becomes complex with multiple steps including via hole formation and photolithography
Solution Approach 1:
The gate insulating layer and pixel separation layer are merged into a single integrated layer structure. The gate insulating layer is formed to cover the gate electrode and simultaneously functions as the pixel separation layer, eliminating the need for separate formation processes and reducing fabrication complexity while maintaining device reliability
Solution Approach 2:
The gate insulating layer serves multiple functions simultaneously: it provides electrical insulation for the gate electrode, defines the pixel boundaries through its patterned openings, and acts as a structural support layer. This multi-functionality reduces the number of required layers and simplifies the overall fabrication process
2Manufacturing precision
If multiple separate layers and processes are used for gate insulating layer and pixel separation layer, then precise patterning can be achieved, but the fabrication time and process steps increase significantly
Solution Approach 1:
The gate insulating layer is formed with pre-defined openings that simultaneously serve as both gate insulation structures and pixel separation structures. This preliminary integration of functions into a single layer formation step achieves precise patterning without requiring subsequent separate patterning operations, thereby reducing fabrication time
Solution Approach 2:
The formation of the gate insulating layer and pixel separation layer is combined into a single fabrication step. The layer is deposited or formed to cover the gate electrode while incorporating openings that define pixel boundaries, eliminating multiple sequential steps and reducing overall fabrication time while maintaining patterning precision
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
Simplifies the device structure and fabrication process, reducing defects and operational complexity while maintaining the functionality of the organic EL display apparatus.
Implementation Method 1
forming a gate insulating layer having an opening defining pixels is formed using a laser ablation method
Implementation Method 2
forming a gate insulating layer having an opening defining pixels is formed using a laser induced thermal image method
Data Source
AI summary
A flat panel display apparatus includes a gate insulating layer having openings which define pixels. The flat panel display apparatus includes: a substrate; a source electrode and a drain electrode formed on the substrate; a semiconductor layer contacting the source electrode and the drain electrode; a gate formed on the substrate; an insulating layer formed between the source and drain electrodes and the gate, and including an opening; and a pixel electrode partially exposed by the opening of the insulating layer. The insulating layer acts as a gate insulating layer and a pixel definition layer defining the pixel electrode.