Pressure-Sensing TFT Back Panel for Short-Circuit-Free Micro-LED Transfer
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Solution Overview
Problem
The conventional ACF transfer technology for Micro-LED mass production often results in short circuits due to excessive pressure applied to the TFT back panel, leading to low transfer yields.
Innovation Solution
Incorporating a pressure-sensitive transistor in the TFT back panel that monitors pressure in real time, preventing excessive pressure from causing short circuits during the transfer process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If excessive pressure is applied to the TFT back panel during ACF transfer, then the Au balls in ACF glue are released and connection between TFT back panel and LED chip is realized, but short circuit in conduction of internal circuits occurs resulting in low transfer yield
Solution Approach 1:
A pressure-sensitive transistor is integrated into the TFT back panel before the transfer process to monitor pressure in real-time. This preliminary monitoring system detects pressure changes and generates signals to prevent excessive pressure before it causes short circuits, enabling proactive protection rather than reactive damage control
Solution Approach 2:
The pressure-sensitive transistor creates a feedback mechanism by continuously monitoring the pressure applied during transfer and converting pressure changes into electrical signals. This feedback loop allows the system to adjust or alert when pressure approaches dangerous levels, preventing the harmful effect of short circuits while maintaining the necessary pressure for successful transfer
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 pressure-sensitive transistor effectively prevents short circuits and improves transfer yields by allowing real-time monitoring and adjustment of pressure applied during the LED transfer process.
Implementation Method 1
a first pressure-sensitive material layer (71), wherein when the first pressure-sensitive material layer (71) is under pressure, a second conductive layer (82) on one side of the first pressure-sensitive material layer (71) forms a low potential, and a second gate (52) on an other side of the first pressure-sensitive material layer (71) forms a high potential
Data Source
AI summary
Embodiments of the present disclosure provide a thin film transistor (TFT) back panel a light-emitting diode (LED) display panel and a manufacturing method therefor. In the TFT back panel provided in the embodiments of the present disclosure, a pressure-sensitive transistor is disposed. When a first pressure-sensitive material layer is subjected to a pressure, a pressure-sensitive transistor is turned on to generate a current, and a pressure signal is converted into an electrical signal. Changes in a pressure applied to the TFT back panel during transfer and pressing of an LED can be monitored in real time by monitoring a magnitude of the electrical signal.