OLED Light Blocking Layer Segmentation to Prevent Crystallization
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Solution Overview
Problem
Organic light emitting diode (OLED) displays face crystallization defects due to the light blocking layer, which affects brightness and manufacturing processes.
Innovation Solution
An OLED display structure with a light blocking layer made of metallic materials like chrome, disposed on the same layer as semiconductor patterns, and a method of manufacturing that includes etching to form semiconductor and light blocking layers, reducing the likelihood of crystallization defects and simplifying the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light blocking layer is disposed below the thin film transistors to improve brightness, then brightness is improved, but crystallization defects occur in the semiconductor of the thin film transistors
Solution Approach 1:
The invention divides the light blocking layer into separate regions: a first light blocking layer disposed below the thin film transistor and a second light blocking layer disposed below the pixel electrode. This segmentation prevents the light blocking layer from directly contacting the semiconductor, thereby preventing crystallization defects while maintaining brightness improvement.
Solution Approach 2:
The invention introduces an intermediary approach by positioning the light blocking layer in specific locations that block light effectively while preventing direct interaction with the semiconductor. The first light blocking layer is positioned to block light without causing crystallization, and the second light blocking layer further enhances light blocking functionality.
2Ease of manufacture
If conventional manufacturing processes are used with light blocking layer, then manufacturing can proceed, but crystallization defects affect product quality and require additional process steps
Solution Approach 1:
The invention applies preliminary action by forming the first light blocking layer before forming the semiconductor layer. This sequence prevents the light blocking layer from causing crystallization defects in the semiconductor, as the light blocking layer is already in place and configured to prevent direct contact or harmful interactions with the semiconductor material.
Solution Approach 2:
The invention applies local quality by positioning light blocking layers in specific locations: the first light blocking layer below the thin film transistor and the second light blocking layer below the pixel electrode. This localized positioning ensures light blocking effectiveness while preventing crystallization defects in the semiconductor regions.
Data Source
AI summary
An organic light emitting diode display including a substrate; a light blocking layer disposed on the substrate and having a semiconductor opening; a first semiconductor pattern disposed in the semiconductor opening; a gate insulating layer disposed on the light blocking layer and the first semiconductor pattern; a first gate electrode disposed on the gate insulating layer; a first source electrode electrically connected to the first semiconductor pattern; a first drain electrode spaced apart from the first source electrode; a protective insulating layer disposed on the first source electrode and the first drain electrode, the protective insulating layer having a contact portion; a pixel electrode disposed on the protective insulating layer contacting the first drain electrode through the contact portion; an emitting layer disposed on the pixel electrode; and a common electrode disposed on the emitting layer.