Double-Gate Transistor Adaptive Threshold Voltage Control
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Solution Overview
Problem
Conventional TFT-based image sensing systems require time-consuming calibration to determine suitable gate control voltages due to manufacturing process and temperature variations, limiting their dynamic range.
Innovation Solution
An electronic device with a sensing module and a threshold voltage generation module, featuring a double-gate transistor with a semiconductor layer between its gates, which adaptively adjusts the gate control voltage to provide a threshold voltage in a dark state, compensating for process and temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional TFT-based photo sensors are used, then manufacturing simplicity is maintained, but time-consuming calibration is required due to process and temperature variations
Solution Approach 1:
The patent implements a dual-gate transistor structure where the first gate is pre-configured with a fixed voltage and the second gate receives adaptive voltage adjustment. This preliminary configuration of the first gate eliminates the need for post-manufacturing calibration, as the structure itself is designed to accommodate voltage variations through the second gate's adaptive control mechanism.
Solution Approach 2:
The patent changes the voltage parameter of the second gate adaptively based on detected threshold voltages. By dynamically adjusting the second gate's voltage parameter, the system compensates for process and temperature variations without requiring time-consuming calibration procedures, thus resolving the contradiction between manufacturing precision and calibration time.
2Adaptability or versatility
If fixed gate control voltage is used, then device complexity is reduced, but dynamic range is limited due to process and temperature variations
Solution Approach 1:
The patent transforms the static fixed voltage system into a dynamic adaptive system. The second gate's voltage is no longer fixed but dynamically adjusted based on the detected threshold voltage of the TFT device. This dynamic adjustment mechanism expands the dynamic range while maintaining manageable complexity through automated feedback control.
Solution Approach 2:
The patent implements a feedback mechanism where the system detects the threshold voltage of the TFT device and uses this information to automatically adjust the second gate's control voltage. This feedback loop enables the system to adapt to process and temperature variations, expanding the dynamic range without requiring complex manual calibration procedures.
3Measurement precision
If separate calibration is performed for each TFT device, then measurement precision is improved, but productivity is reduced
Solution Approach 1:
The patent enables each TFT device to self-determine its optimal operating parameters through the adaptive second gate control. Instead of requiring external calibration equipment and procedures for each device, the system allows the transistor itself to provide the necessary information (threshold voltage) that automatically configures its optimal operating state, thereby maintaining precision while dramatically improving productivity.
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
Enables a large dynamic range of image sensing, enhancing image quality by independently adjusting threshold voltages to accommodate variations, thus reducing the need for extensive calibration.
Implementation Method 1
An image sensing system adopts a photo sensor to detect and convey light information
Implementation Method 2
The threshold voltage generation module includes a node coupled to the second gate of the sensing transistor, and is used to provide a threshold voltage in a dark state to the node of the threshold voltage generation module
Data Source
AI summary
An electronic device includes a first sensing module and a first threshold voltage generation module. The first sensing module includes a first sensing transistor having a first gate, a second gate and a semiconductor layer. The semiconductor layer of the first sensing transistor is disposed between the first gate and the second gate of the first sensing transistor. The first gate of the first sensing transistor is coupled to a top gate line. The first threshold voltage generation module includes a node coupled to the second gate of the first sensing transistor, and is used to provide a first threshold voltage in a dark state to the node of the first threshold voltage generation module.