OLED Shield Layer for Transistor Threshold Control
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Solution Overview
Problem
Existing OLED displays face challenges in improving the transistor characteristics of thin film transistors connected to OLEDs, which affect the light emission efficiency and reliability of the devices.
Innovation Solution
The implementation of a shield layer that overlaps the active patterns of transistors and is strategically positioned between the substrate and a strengthened substrate, with power supply capabilities, to control threshold voltages and enhance transistor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shield layer is added to control threshold voltages and improve transistor characteristics, then transistor reliability and light emission efficiency are improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
A shield layer is introduced as an intermediary component between the substrate and the strengthened substrate. This shield layer includes shield lines that overlap with the active patterns of transistors to control threshold voltages and reduce hysteresis effects, thereby improving transistor reliability without requiring fundamental changes to the existing transistor structure
Solution Approach 2:
The shield layer modifies the electrical parameters of the transistor by controlling threshold voltages through capacitive coupling. By adjusting the position, shape, and electrical properties of the shield lines, the threshold voltage and hysteresis characteristics of the transistors can be optimized for improved reliability
2Productivity
If a shield layer is added to improve transistor characteristics, then light emission efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The shield layer is segmented into multiple shield lines that are strategically positioned to overlap with specific active patterns of transistors. This segmentation allows for targeted control of threshold voltages in different regions of the display, optimizing light emission efficiency while maintaining manageable manufacturing complexity through modular structure
Solution Approach 2:
The shield layer serves multiple functions simultaneously: it controls threshold voltages, reduces hysteresis effects, and improves light emission efficiency. By integrating these functions into a single component, the invention avoids the need for multiple separate structures, thereby managing manufacturing complexity while achieving multiple performance improvements
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 improves the transistor characteristics and light emission efficiency of OLEDs by controlling threshold voltages and reducing hysteresis, leading to enhanced display performance and manufacturing ease.
Implementation Method 1
a shield layer traversing the pixel circuits and overlapping the active pattern of part of the transistors
Data Source
AI summary
An organic light-emitting diode (OLED) display is disclosed. In one aspect, the display includes a substrate, a plurality of OLEDs provided over the substrate, and a plurality of pixel circuits provided between the substrate and the OLEDs. Each of the pixel circuits comprises a plurality of transistors each including an active pattern electrically connected to the respective OLEDs. A shield layer overlaps the pixel circuits and the active patterns of the transistors in the depth dimension of the OLED display.