Imaging Device Intermediate Electrode for Image Lag Suppression
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Solution Overview
Problem
Existing imaging devices experience image lag when signal reading occurs at high speeds due to unresolved carrier discharge issues in photoelectric conversion films.
Innovation Solution
Incorporating an intermediate electrode between pixel electrodes, in contact with the photoelectric conversion film, and an insulating film between the electrodes and the film, to facilitate efficient carrier discharge and reduce crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a transparent electrode is used to discharge electric carriers in the photoelectric conversion film, then carrier discharge is achieved, but image lag occurs when signal is read at high speed
Solution Approach 1:
The electrode structure is segmented into multiple electrodes (first transparent electrode, second transparent electrode, and reflective electrode) positioned at different locations. This segmentation allows different regions to perform different functions: the first transparent electrode collects carriers from the first photoelectric conversion film, the second transparent electrode collects carriers from the second photoelectric conversion film, and the reflective electrode provides an additional discharge path, thereby enabling high-speed reading without image lag
Solution Approach 2:
The insulating film serves as an intermediary layer between the pixel electrode and the photoelectric conversion film, and between adjacent photoelectric conversion films. This intermediary structure enables proper electrical isolation and carrier collection paths, allowing efficient discharge of electric carriers while preventing crosstalk between adjacent pixels, thus suppressing image lag at high reading speeds
2Length of stationary object
If the distance between counter electrode and pixel electrode is reduced, then device thickness is reduced, but carrier discharge efficiency decreases
Solution Approach 1:
The photoelectric conversion device is divided into multiple stacked layers with alternating photoelectric conversion films and insulating films. This segmentation creates multiple discrete carrier collection interfaces, allowing efficient carrier discharge across thin layers without requiring large electrode spacing, thus maintaining both thin profile and high discharge efficiency
Solution Approach 2:
The electrode and insulating structure is extended in the vertical stacking dimension rather than relying solely on horizontal spacing. By creating multiple layers stacked vertically with alternating functional films, the device achieves efficient carrier discharge through increased interfacial area in the vertical dimension while maintaining compact overall thickness
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 effectively suppresses image lag by ensuring efficient discharge of electric carriers, enhancing imaging performance even at high-speed signal reading.
Implementation Method 1
a photoelectric conversion film that continuously covers the pixel electrode
Implementation Method 2
an insulating film is provided between the first pixel electrode and the photoelectric conversion film, and between the second pixel electrode and the photoelectric conversion film
Data Source
AI summary
An imaging device includes a first pixel electrode, a second pixel electrode adjacent to the first pixel electrode, and a photoelectric conversion film continuously covering the first pixel electrode and the second pixel electrode, in which an insulating film is provided between the first pixel electrode and the photoelectric conversion film, and between the second pixel electrode and the photoelectric conversion film, and an intermediate electrode is provided in a position between the first pixel electrode and the second pixel electrode, the intermediate electrode being in contact with a surface of the photoelectric conversion film, the surface being on a side where the first and second pixel electrodes are arranged.