Segmented Drive Transistor Layout for Stable OLED Pixel Current
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Solution Overview
Problem
Current display devices, particularly organic electroluminescence (EL) displays, face challenges in achieving high image quality due to limitations in the design of drive transistors, which affect the consistency and efficiency of current supply to light-emitting elements.
Innovation Solution
The implementation of a drive transistor with a coupling section and multiple channel sections coupled in series, allowing for enhanced current supply to light-emitting elements, thereby improving image quality by reducing the risk of degradation and characteristic variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the channel length of the drive transistor is increased to reduce sensitivity to pixel voltage variations, then the current driving capability and response speed deteriorate
Solution Approach 1:
The drive transistor channel is divided into multiple channel sections that are coupled in series. This segmentation allows the total channel length to be extended for better current stability while maintaining a reasonable response speed by distributing the channel length across multiple sections rather than using a single long channel.
2Reliability
If the channel length of the drive transistor is increased to stabilize drive current, then the area of the transistor increases
Solution Approach 1:
The channel sections are arranged in a multi-dimensional layout rather than a simple linear extension. By coupling multiple channel sections in series with optimized spatial arrangement, the effective channel length is extended without linearly increasing the transistor area, thus achieving better current stability with minimal area penalty.
3Reliability
If multiple channel sections are coupled in series to improve current stability, then the device complexity increases
Solution Approach 1:
Multiple channel sections are merged into a single integrated transistor structure with shared source and drain regions. This combining approach achieves the current stability benefits of a long channel while minimizing the complexity increase by reusing common structural elements across the channel sections rather than creating entirely separate transistor units.
Data Source
AI summary
There is provided a display device including: a light emitting element; and a drive transistor (DRTr) that includes a coupling section (W1) and a plurality of channel sections (CH) coupled in series through the coupling section (W1), wherein the drive transistor (DRTr) is configured to supply a drive current to the light emitting element.