Display-Integrated PUF Authentication Through Threshold Charge Storage
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Solution Overview
Problem
Unauthorized use and data security issues in electronic components and systems, particularly in display devices with semiconductor integrated circuits, are a concern due to unauthorized intrusion, data outflow, and alteration.
Innovation Solution
An authentication device utilizing a PUF (Physical Unclonable Function) is integrated into a display device, comprising a transistor, photoelectric conversion element, and capacitive element, with a control circuit to generate a PUF-ID through controlled charging and light emission processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PUF-based authentication system is implemented in a display device, then individual authentication capability and security are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines the PUF authentication circuit with the existing display device pixel structure. The photoelectric conversion element, capacitive element, and transistor are integrated into the display pixel circuit, allowing the authentication function to be merged with the display function. This reduces overall device complexity by sharing common structures between authentication and display operations.
Solution Approach 2:
The display device is designed to perform multiple functions: normal display operation and PUF-based authentication. The same photoelectric conversion element and circuit structures are utilized for both displaying images and generating authentication data, making the device universal and avoiding the need for separate authentication hardware.
2Measurement precision
If multiple control periods and charging operations are implemented for PUF-ID generation, then authentication accuracy is improved, but processing time and operational complexity increase
Solution Approach 1:
The patent implements authentication through multiple periodic control periods (fourth, fifth, and sixth periods) where charges are sequentially stored and corrected in the capacitive element. Each period performs a specific function: initial charge storage, threshold correction, and final PUF-ID generation. This periodic approach improves measurement precision by multiple sampling and correction cycles.
Solution Approach 2:
The fourth period performs preliminary actions by storing initial charge corresponding to the transistor threshold and correcting the threshold before the actual authentication measurement. This preliminary correction of threshold voltage variations ensures more accurate subsequent measurements in the fifth and sixth periods, improving overall authentication accuracy.
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
Enhances individual authentication and security in display devices by generating a unique PUF-ID, preventing unauthorized use and ensuring data integrity.
Implementation Method 1
a capacitive element connected between the gate electrode and the drain electrode
Implementation Method 2
a photoelectric conversion element having a first electrode connected to a drain electrode of the first transistor
Data Source
AI summary
An authentication device includes a display device and a control circuit. The display device includes a first transistor having a gate and a source electrode, a photoelectric conversion element having a first electrode connected to a drain electrode of the first transistor, and a capacitive element connected between the gate electrode and the drain electrode. The control circuit controls resetting the drain electrode, initializing the gate electrode, storing first charge corresponding to the threshold of the first transistor in the capacitive element, setting the threshold of the first transistor, transmitting a signal including data for causing the photoelectric conversion element to emit to the gate electrode, adding second charge corresponding data to the first charge, causing the photoelectric conversion element to emit, reading a voltage corresponding to the first charge and the second charge, and generating a PUF-ID using the voltage.