Display Substrate Piezoelectric Layer for TFT Heat Uniformity
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Solution Overview
Problem
Existing display substrates face challenges in maintaining uniformity and stability of threshold voltages for thin-film transistors (TFTs) due to temperature differences caused by self-heating effects, which are not effectively addressed by existing solutions like copper thin films with buffer layers, leading to varying drift degrees of threshold voltages at different positions.
Innovation Solution
A display substrate is designed with a piezoelectric layer, typically made of materials like lead zirconate titanate, zinc oxide, or polyvinylidene fluoride, that converts heat generated by TFTs into sound waves, improving heat dissipation and uniformity by direct contact with active layers and using a shielding layer for enhanced sound wave conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If copper thin films with buffer layers are used for heat dissipation, then heat dissipation capability is improved, but temperature differences between different positions of TFTs are not effectively eliminated
Solution Approach 1:
The invention divides the heat dissipation function into multiple independent piezoelectric layers, each positioned beneath specific TFTs. This segmentation allows localized heat conversion, ensuring uniform temperature distribution across different positions of the display substrate, thereby eliminating the temperature differences that cause threshold voltage non-uniformity.
Solution Approach 2:
The invention replaces the conventional thermal conduction mechanism (copper thin films) with a thermoacoustic conversion mechanism (piezoelectric layers). The piezoelectric layers convert heat into sound waves, which propagate energy more uniformly throughout the substrate, effectively dissipating heat and eliminating localized temperature differences that buffer layers fail to address.
2Stability of the object's composition
If piezoelectric layers are added to convert heat into sound waves, then temperature uniformity is improved, but device structure becomes more complex
Solution Approach 1:
The piezoelectric layers serve multiple functions simultaneously: they act as heat dissipation elements by converting heat to sound waves, serve as structural support layers, and can function as electrical isolation layers. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving improved temperature uniformity.
Solution Approach 2:
The invention employs composite material structures where piezoelectric materials are integrated with existing substrate materials. This composite approach allows the piezoelectric layers to be incorporated into the existing device architecture with minimal additional complexity, while providing the dual benefits of heat conversion and structural integrity.
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 suppresses temperature rise and eliminates temperature differences across TFTs, improving the stability and reliability of TFTs, uniformity of threshold voltages, and display stability by efficiently converting heat into sound waves, thereby prolonging the working life of TFTs.
Implementation Method 1
a piezoelectric layer arranged on the base, and TFTs arranged on the piezoelectric layer, the piezoelectric layer being configured to convert heat generated by the TFTs into sound waves
Data Source
AI summary
The embodiments of the present application provide a display substrate and method for preparation thereof, and a display device. The display substrate includes a base, a piezoelectric layer arranged on the base, and a thin-film transistor arranged on the piezoelectric layer, said piezoelectric layer being configured to convert heat generated by the thin-film transistor into sound waves.