OLED TFT Via-Hole Light Shielding for Channel Reliability
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Solution Overview
Problem
Thin film transistors in OLED display panels are prone to performance deterioration and reliability reduction due to light irradiation, which affects device performance and stability.
Innovation Solution
A display panel design that includes a thin film transistor with a channel protected by first and second light-shielding conductive elements, which are filled in via holes penetrating through an interlayer insulation layer, providing stable electrical connections and enhanced light-blocking capabilities to prevent light-induced damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the channel region is exposed to light for normal OLED operation, then the display function is achieved, but the thin film transistor performance deteriorates and reliability reduces due to light sensitivity of the channel
Solution Approach 1:
The conductive portion is divided into multiple segments: a first conductive portion, a second conductive portion, and a light-shielding conductive portion positioned between them. This segmentation allows the channel to be electrically connected while protecting it from light irradiation, resolving the contradiction between display functionality and transistor reliability.
Solution Approach 2:
A light-shielding conductive portion is introduced as an intermediary element between the first and second conductive portions. This intermediary blocks light from reaching the channel while maintaining electrical connectivity through the conductive layers, thereby protecting the transistor without compromising display operation.
2Object-affected harmful factors
If light-shielding structures are added to protect the channel, then light shielding capability is improved, but device complexity increases due to additional via holes and conductive elements
Solution Approach 1:
The light-shielding conductive portion serves multiple functions simultaneously: it blocks light from reaching the channel, provides electrical connection between conductive portions, and integrates with the existing interlayer insulation layer structure. This multi-functionality reduces the need for separate light-shielding components, thereby managing device complexity.
Solution Approach 2:
The light-shielding function is merged with the conductive function by using a conductive material for the light-shielding portion. This merging eliminates the need for separate light-shielding and conductive structures, simplifying the overall device architecture while achieving both light protection and electrical connectivity.
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
The solution effectively reduces the likelihood of performance deterioration and reliability issues in thin film transistors, improving device performance and display stability by providing robust light shielding and stable electrical connections.
Implementation Method 1
first light-shielding conductive element filled in the first via hole... second light-shielding conductive element filled in the second via hole... provide robust light shielding and stable electrical connections
Data Source
AI summary
A display panel and a manufacturing method thereof are provided. The display panel includes a thin film transistor. The thin film transistor includes a channel, a first conductive portion and a second conductive portion disposed on two sides of the channel, an interlayer insulation layer, a first electrode, and a second electrode. Wherein, the display panel includes a first via hole and a second via hole, the first via hole penetrates through the interlayer insulation layer and exposes a surface and a side of the first conductive portion, a first light-shielding conductive element is filled in the first via hole, the second via hole penetrates through the interlayer insulation layer and exposes a surface and a side of the second conductive portion, and the second light-shielding conductive element is filled in the second via hole.