OLED Trench Insulation for Transistor Heat Isolation
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Solution Overview
Problem
Existing organic light emitting display (OLED) devices face challenges in managing heat generated by driving transistors, which can lead to deterioration of adjacent transistors and affect the reliability and lifetime of the display.
Innovation Solution
Incorporating a trench structure around the driving transistor to isolate heat, combined with a planarization layer of lower thermal conductivity that fills the trench, preventing heat transfer to adjacent transistors and improving thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving transistors are used to control sub-pixel regions, then display functionality is achieved, but heat is generated that can deteriorate adjacent transistors
Solution Approach 1:
The patent divides the continuous insulation layer into separate first and second insulation layer patterns that are spatially isolated by a predetermined distance. This segmentation creates thermal zones that prevent heat from the driving transistor from reaching adjacent transistors, thereby resolving the contradiction between maintaining display functionality and preventing heat-induced deterioration.
Solution Approach 2:
The patent applies different thermal insulation configurations in different spatial zones: the first insulation layer pattern is positioned near the driving transistor to provide localized thermal management, while the second insulation layer pattern is positioned at a distance to prevent heat propagation to adjacent transistors. This local differentiation of insulation properties addresses the heat generation problem without compromising overall device functionality.
2Area of stationary object
If insulation layers are placed close together to save space, then device area is reduced, but heat transfer between adjacent transistors increases
Solution Approach 1:
The insulation layer is segmented into two separate patterns with a predetermined distance between them. This segmentation strategically places thermal barriers at critical locations while maintaining compact overall device dimensions, thus preventing heat transfer without excessive area consumption.
Solution Approach 2:
The patent optimizes the predetermined distance between the first and second insulation layer patterns to achieve the right balance between thermal isolation and area efficiency. By carefully controlling this spatial parameter, the design prevents heat transfer while minimizing the increase in device area.
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 solution effectively reduces heat transfer and prevents transistor deterioration, enhancing the reliability and longevity of OLED devices by isolating heat generated from driving transistors.
Implementation Method 1
a planarization layer on the driving and switching transistors and the insulation layer structure, the planarization layer filling the trench and being in contact with the exposed portion of the upper surface of the substrate. A thermal conductivity of the planarization layer may be less than a thermal conductivity of the insulation layer structure.
Data Source
AI summary
An organic light emitting display (OLED) device includes a substrate having a display region including a plurality of sub-pixel regions, a respective driving transistor and a respective switching transistor on the substrate in each of the sub-pixel regions, an insulation layer structure on the substrate, the insulation layer structure having a respective trench surrounding the driving transistor in each of the sub-pixel regions, and a respective sub-pixel structure on the insulation layer structure in each of the sub-pixel regions.