Detection Pixel Circuit With Storage Capacitor to Prevent X-Ray Crosstalk
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Solution Overview
Problem
Traditional X-ray imaging technologies, including analog X-radiographic testing, suffer from low resolution and poor image quality, while X-ray Digital Radiography (DR) systems face issues with crosstalk and brightness stabilization in detection pixels due to direct short-circuiting of electrodes in PIN-type photosensitive devices.
Innovation Solution
A detection substrate with a storage capacitor and transistors in each detection pixel, where the discharge circuit writes the bias voltage signal into the second electrode plate under a scanning signal, and the reading circuit manages the voltage and reference signal with an external reading circuit, ensuring high brightness and preventing crosstalk by limiting charge transfer and using a storage capacitor with a fixed capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If direct short-circuiting of electrodes is used in PIN-type photosensitive devices, then brightness stabilization is achieved, but crosstalk occurs between adjacent pixels
Solution Approach 1:
The detection substrate is divided into multiple independent detection pixels, each with its own storage capacitor and discharge circuit. This segmentation isolates the charge storage function to specific regions, preventing charge leakage between adjacent pixels while maintaining brightness stability through controlled discharge paths.
Solution Approach 2:
A storage capacitor is introduced as an intermediary element between the photoelectric conversion layer and the readout circuit. The capacitor stores the generated charge temporarily, allowing controlled discharge through dedicated circuits rather than direct short-circuiting, thereby preventing crosstalk while maintaining signal integrity.
2Device complexity
If traditional analog X-ray imaging is used, then device complexity is reduced, but image quality and resolution deteriorate
Solution Approach 1:
The patent replaces traditional analog mechanical imaging systems with a digital electronic detection system. Each pixel functions as an independent charge storage and readout unit, enabling direct digital signal acquisition that maintains high resolution while reducing the complexity of analog signal processing and mechanical components.
3Measurement precision
If detection marking pixels are added for position reference, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The detection marking pixels utilize the same circuit structure as regular detection pixels, including photoelectric conversion layers, storage capacitors, and readout circuits. This universal design allows position reference functionality to be integrated without adding separate complex subsystems, maintaining structural consistency across the entire detection substrate.
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 solution ensures high brightness and stability of detection marking pixels, preventing crosstalk and maintaining normal operation of adjacent pixels, thereby improving image quality and resolution.
Implementation Method 1
a photoelectric conversion layer, the orthographic projection of the photoelectric conversion layer on the base substrate is located in an orthographic projection of the bias voltage layer
Data Source
AI summary
Provided are a detection substrate and a ray detector. The detection substrate includes: a base substrate; a plurality of detection pixels located on the base substrate, at least one detection pixel serves as a detection marking pixel. The detection marking pixel includes: a storage capacitor, a first electrode plate of the storage capacitor coupled to a bias voltage end; a discharge circuit configured to write a signal of the bias voltage end into a second electrode plate of the storage capacitor under the control of a first scanning signal end; and a reading circuit coupled to an external reading circuit, the reading circuit configured to write the voltage of the second electrode plate of the storage capacitor into the external reading circuit and write a reference signal of the external reading circuit into the second electrode plate of the storage capacitor under the control of a second scanning signal end.