Ultrasonic Sensor Pixel Diode-Free Circuit Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The manufacturing process of sensor pixels for ultrasonic fingerprint recognition is complex and costly due to the use of diodes in existing technologies.
Innovation Solution
A sensor pixel design that includes a piezoelectric transducer connected to a node control, drive, and read subcircuit, eliminating the need for diodes by using transistors and capacitors, and incorporating a shielding and insulating layer to reduce noise and improve signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diode is used to rectify the electrical signal in the sensor pixel, then the signal rectification function is achieved, but the manufacturing process becomes complicated and cost increases
Solution Approach 1:
The patent removes the diode component from the sensor pixel structure, extracting the rectification function from a dedicated hardware component and implementing it through the existing transistor and capacitor elements in the circuit, thereby simplifying the manufacturing process while maintaining the rectification capability
Solution Approach 2:
The existing transistor and capacitor elements in the sensor pixel circuit are made to serve multiple functions: the transistor acts as both a switching element and a rectification element, while the capacitor serves both as a timing element and a rectification assistance element, eliminating the need for a separate diode component
2Reliability
If a diode is used to rectify the electrical signal in the sensor pixel, then the signal rectification function is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent removes the diode component from the sensor pixel structure, extracting the rectification function from a dedicated hardware component and implementing it through the existing transistor and capacitor elements in the circuit, thereby simplifying the manufacturing process while maintaining the rectification capability
Solution Approach 2:
The patent combines the rectification function with the existing transistor and capacitor elements that are already present in the sensor pixel circuit for other functions, merging multiple functions into fewer components to reduce manufacturing steps and material costs
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
Simplifies the manufacturing process and reduces costs while maintaining high precision in ultrasonic fingerprint recognition by using a diode-free design with transistors and capacitors, and enhancing signal detection through shielding and insulating layers.
Implementation Method 1
a piezoelectric transducer arranged on the base substrate, and a sensor pixel circuit, wherein the piezoelectric transducer is connected to a first signal input terminal and a first node
Data Source
AI summary
The present disclosure provides a sensor pixel, an ultrasonic sensor, an OLED display panel and an OLED display device, in which the sensor pixel includes a base substrate, a piezoelectric transducer and a sensor pixel circuit arranged on the base substrate; the energy sensor is connected to a first signal input terminal and the first node; the sensor pixel circuit includes a signal node control subcircuit for controlling the first node according to a signal of the reset signal terminal and a signal of the second signal input terminal, a drive subcircuit for providing a detection signal to the second node under the control of a signal of the first node, and a read subcircuit for providing a signal of the second node to the signal read line under the control of the read signal terminal.