Pixel Circuit Stabilizing Piezoelectric Pressure Signals
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Solution Overview
Problem
Existing pixel circuits for detecting pressure using piezoelectric elements face challenges in accurately and stably converting pressure into electrical signals due to instability in voltage and current output.
Innovation Solution
A pixel circuit design incorporating transistors and capacitive elements that adjust and output voltage and current levels based on energy conversion, ensuring stable voltage maintenance across nodes and efficient current output through controlled signal intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If piezoelectric elements are used to detect pressure, then pressure detection capability is achieved, but voltage and current output instability occurs
Solution Approach 1:
The patent introduces intermediate circuit components (capacitors C1-C3, transistors TR1-TR5, and diodes DB) between the piezoelectric element and the output to mediate and stabilize the electrical signal. These intermediaries buffer and condition the raw piezoelectric output, converting unstable voltage/current into stable signals suitable for accurate pressure detection and reliable output.
Solution Approach 2:
The circuit performs preliminary signal conditioning through multiple stages before final output. Capacitors C1 and C2 perform initial voltage stabilization and signal conditioning, while transistor TR1 and associated capacitors perform secondary conditioning. This preliminary action ensures the signal is properly stabilized before being output, preventing downstream instability issues.
2Reliability
If multiple transistors and capacitive elements are added to stabilize voltage and current, then output stability is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into a single integrated pixel circuit structure. The capacitors, transistors, and diodes are combined in a compact arrangement where each component serves multiple purposes: capacitors provide both signal conditioning and voltage stabilization, transistors perform both switching and amplification, and the overall structure integrates sensing, signal processing, and output control in one unit, reducing system-level complexity despite increased component count.
Solution Approach 2:
Each component in the circuit is designed to perform multiple functions. For example, capacitors C1-C3 serve both as signal coupling elements and voltage stabilization elements; transistors TR1-TR5 perform switching, amplification, and signal conditioning roles; the diode DB provides both protection and signal rectification. This multi-functionality reduces the need for separate dedicated components, managing overall device complexity.
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 design enables stable conversion and output of voltage and current levels corresponding to applied pressure, improving the accuracy and reliability of pressure detection in artificial skin and similar input devices.
Implementation Method 1
When a pressure is externally applied by the piezoelectric effect, the piezoelectric element may generate a charge.
Data Source
AI summary
Provided is a pixel circuit. The pixel circuit includes a conversion element forming a voltage of an input level at a first node, a first transistor adjusting the voltage of the first node to a first level in response to a first signal received at a first time interval, a first capacitive element forming a voltage at a second node based on the voltage of the first node, a second transistor adjusting a level of the voltage of the second node to a second level in response to the first signal, a third transistor forming a voltage at a third node, a fourth transistor outputting a current in response to a second signal received in a second time interval, and a. fifth transistor adjusting the voltage of the third node to a third level in response to a third signal received in a third time interval.